Question Bank in AC Motors 1
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Question Bank in AC Motors 1...
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Queston Bank in AC Moors 1. REE Board Exam Ocober 1997 A single !ase inducton moor is raed " !# 7"$ o%er &acor and ''( )ols. *!a is is &ull load curren+ A. ''." ameres B. '(." ameres C. 1,." ameres -. 1." ameres '. EE Board Exam Aril 199( A " !# /0!ase moor dra%s curren %!en conneced o '/( . . -eermine !e curren dra%n b2 !e moor i& !e o%er &acor is (.9( and e3cienc2 o& /$. A. 1'."/ A C. 1/.'" A B. 1".1/ A -. 14.(" A /. EE Board Exam Aril 1994 A /0!ase moor is raed 7"( ! a 4,( )ols line o line# (." & lagging and (.9" e3cienc2. 5ol)e &or !e raed curren. A. ,9.,4 A C. 4 (".4/ A B. 7('.'/ A -. 917./' A 4. EE Board Exam Aril 19" A 4( !# /0!ase# 40ole# '/( )ol# ,( 6# inducton moor oeratng a (.9( e3cienc2# e3cienc2# (." o%er &acor and / ercen sli# dri)es a %aer um. -eermine !e curren a %!ic! !e moor is oeratng. A. 94."/1 A C. 97.91" A B. 9,.'/4 A -. 9/./"1 A ". ,. 7. . EE Board Exam Aril 199' Calculae !e seed o& a ,(0c2cle# 140ole moor i& !e sli is "$. A. "14.' rm B. 4."7 rm C. 4",./' rm -. 4'9.,/ rm EE Board Exam Aril 199' 8!e roor seed o& a six0ole# "(0c2cle inducton moor is 9,( rm. Calculae !e ercen sli. A. "$ C. 4$ B. '$ -. /$ REE Board Exam Ocober 1997 *!a is !e seed o& an inducton moor o& six oles i& !e ercen sli is '."$+ A. 14,' rm C. 77 rm B. 117( rm -. 17"" rm EE Board Exam Ocober 194 A suirrel cage inducton moor %i! namelae daa o& 1"( 6:# /0!ase# 4,( # ,( 6# ,0ole# (." .&. %as sub;eced o cerain er&ormance ess. 8!e es resul readings %ere as &ollo%s< =ull0load curren > '(' A =ull0load orue > ,7,. lb0? 5ol)e &or !e ercenage sli. A. /.'$ C. /.("$ B. 4.1"$ -. '.'"$ 9. REE Board Exam Marc! 199 A "( 6: !ree0!ase moor# raed raed ''( # 7"$ o%er &acor !as , oles. 8!e sli a &ull load is /$. *!a is !e &reuenc2 o& !e roor curren a &ull0load+ A. 1. 6 C. ".4 6 B. ,( 6 -. ".' 6 1(. EE Board Exam Aril 19, A 1"( 6:# /0!ase# ,0ole# 4,( # ,( 6 inducton moor dra%s 19" A line curren a &ullload seed o& 117( rm and (." .&. 5ol)e &or !e ercen sli a &ull0load. A. '."$ C. '.$ B. /.($ -. '.($ 11. EE Board Exam Ocober 19, 8!e dee %ell um moor is "( 6:# 6:# /0!ase# 4 oles# '/( )ols# ,( 6 inducton moor# moor# oeratng a (.9( e3cienc2# e3cienc2# (." o%er &acor and /$ sli. -eermine !e curren a %!ic! !e moor is oeratng. A. 11'.7 A C. 1'(." A B. 1''.4 A -. 1'4.7 A 1'. EE Board Exam Aril 199/ 8!e roor o& a ''( # ,( 6# 40ole inducton moor !as a o%er inu o& ( k* is obser)ed !a !e roor em& makes 9( c2cles er minue. Calculae !e roor coer loss. A. ' k* C. / k* B. " k* -. 4 k* 1/. EE Board Exam Ocober 199( A 1(06:# 1(06:# 4 ole# '" 6# /0!ase inducton moor is aking 91(( %a@s &rom !e line. Core loss is '9( %a@s saor coer loss is ", %a@s roor coer loss is 44" %a@s and !e &ricton and %indage loss is 1'1 %a@s. -eermine !e ouu orue in e%on0meers. A. 1(.4 C. 1(1.' B. 11'." -. 1(/./ 14.
EE Board Exam Aril 199/ 8!e roor o& a ''( # ,( 6# 4 ole inducton moor !as a o%er inu o& ( k* is obser)ed !a !e roor em& makes 9( c2cles er minue. Calculae !e mec!anical o%er de)eloed. A. 7' k* C. 7" k* B. 7 k* -. 77 k* 1". EE Board Exam Aril 199/ -eermine !e seed in rm o& !e moor a &ull load %i! !e &ollo%ing circui elemens er !ase< Roor leakage reacance > (.," 5aor leakage reacance > 1.1' Roor resisance > (.1( 5aor resisance > (.'" Connecton > D 8!is moor is "(( 6:# 6:# /0!ase# ''(( )ol# ,(c2cle# ,0 ole inducton moor %i! additonal core loss o& '#((( %a@s and !e &ricton and %indage losses oal is 1(#((( %a@s. A. 1'(( rm B. 119, rm C. -. 119( rm 11 rm A. 1.9 k* B. 1. k* C. -. '.( k* '.1 k* ''. EE Board Exam Ocober 1997 1,. EE Board Exam Aril 191# Aril 199 A /( 6:# 6:# 4 oles# /0!ase# '/( )ols# ,( 6 suirrel cage inducton moor oeratng a 9($ e3cienc2# "$ o%er &acor and '."$ sli dri)es a %aer um &or a reser)oir. =ind !e curren and seed a %!ic! !e moor is oeratng. A. 7/.4 A# 17"" rm B. ,'.4 A# 17"" rm C. 7/.4 A# 1(( rm -. ,'.4 A# 1(( rm A %ound roor moor# moor# 7." 6:# 6:# '/( )ols# /!ase akes a line curren o& 1.4 ameres# %!en oeratng a raed ouu a an e3cienc2 o& $. Calculae !e indicatons on %a@meers %!en !ese are insered o measure o%er b2 !e %o %a@meer me!od. A. 4.(/" k*# k*# './'" k* B. 4.'/' k*# '.1', k* C. /.9(' k*# '.4", k* -. /."" k*# '."(/ k* '/. A "( 6:# 6:# /0!ase# 40ole# ,( 6# '/( )ol suirrel cage inducton moor !as an e3cienc2 o& 9($# a o%er &acor o& "$ and a sli o& '$ a &ull0load. =ind !e orue in lb0? a &ull0load. A. 1"'.4" C. 1'1./4 B. 14.7 -. 1"(.", 1. EE Board Exam Ocober 199' 8!e losses in a ''(0# ''(0# !ree0!ase# '" 6# 4ole inducton moor a &ull0 load are as &ollo%s< Core > /.($ = ricton and %indage > '.($ 5aor Cu loss > 4.($ Roor Cu loss > '.($ A 7($ o& &ull0load o& !e mac!ine# deermine is e3cienc2. A. 9(."'$ C. 7.'4$ B. .1"$ -. 9.1$ 19. EE Board Exam Ocober 19( A 1(( 6:# 6:# 44( )ol# !ree0!ase# ,( , ( 6 inducton moor oeraes %i! 9' ercen e3cienc2# e3cienc2# (." o%er &acor# a raed load. *!a is !e curren o& !e moor+ A. 1'" A C. 9 A B. 11" A -. "" A '(. EE Board Exam Ocober 1991 A !ree0!ase %ound roor inducton moor# moor# 44( # ,( c2cles# 4 ole is conneced o a um !a deli)ers 1((( c &m o& %aer agains an eect)e !ead o& ?. Fnder !is load# !e moor dra%s 1" k* a a o%er &acor o& (.9(. *!en oeraed %i!ou load# !e moor dra%s (( %a@s. 8!e saor resisance resisance er !ase is (.'1 o!m and !e roor resisance er !ase is (.('' o!m. 8!e urns rato be%een saor and roor is 4 /.($ = ricton and %indage > '.($ 5aor Cu loss > 4.($ Roor Cu loss > '.($ A 7($ o& &ull0load o& !e mac!ine# deermine is seed and e3cienc2 A. 1#17( rm and .7$ B. 74( rm and 9.1$ C. 1#'(( rm and 9.1$ -. 1#(( rm and 7.9/$ /. EE Board Exam Aril 199' A 4,(0)ol# /0J moor dra%s '( ameres %i! a o%er &acor o& (.91 lagging. Calculae !e cos o& energ2 inu o !e moor during a 4(!rK%k %i! "." censKk*0!r. A. :!"4".",K%eek B. :!//1.7K%eek C. :!14".7K%eek -. :!',7.9K%eek /9. EE Board Exam Ocober 199( A 1(0!# 40ole# '"06# /0J inducton moor is aking 9#1(( %a@s &rom !e line. 8!e core loss is '9( %a@s saor coer loss is ", %a@s roor coer loss is 44" %a@s and !e &ricton and %indage loss is 1'1 %a@s. -eermine !e ouu orue in e%on0meer. A. 1"(.", C. 1(/./' B. 19(./' -. 17.7, 4(. EE Board Exam Aril 19 A Ball Mill roor is raed 7"(0!# 4,( )ols line o line# ,( 6# (." o%er &acor lagging and (.9" e3cienc2. 5ol)e &or !e raed curren. A. 9(( ams C . 7( ams B. 7( ams -. 99( ams 41. REE Board Exam 5eember '((1 A 7(0!# '/(0)ols# /0J inducton moor oeratng a (.77 o%er &acor !as a sartng curren o& " tmes is &ull0load curren. Calculae !e sartng curren. A. "1 ams B. 17( ams C. '9" ams -. 1#47" ams 4'. REE Board Exam 5eember '((1 *!ic! o& !e &ollo%ing is no a reason %!2 a single !ase inducton moor %ill no run+ A. one o& !e curren is made ou o& !ase be%een !e lines B. !2seresis C. s!aded oles -. %o %indings dislaced &rom eac! o!er 4/. REE Board Exam Ocober 199, 8!e &ollo%ing are 2es o& AC moor sarers exce one A. reacance sarer l B. %2e0dela sarer C. across !e line sarer -. caaciance sarer 44. REE Board Exam Aril 199" Moor sartng de)ice !a %ill reduce !e )olage imressed a moorLs erminals during sartng eriods. A. auorans&ormer B. rimar2 resisor02e C. %2e0dela sarer -. all o& !ese 4". EE Board Exam Aril 1994# Aril 199' Basicall2 all elecric moors oerae on !e rincile o& reulsion or . A. inducton B. magnetsm C. resisance -. caaciance 4,. EE Board Exam Aril 1994 8!e rincile o& oeraton o& inducton moor is based on A. =leming Ls rig! !and rule B. roatng magnetc Ield C. =arada2Ls la% -. O!mLs la% 47. EE Board Exam Ocober 199/ A comensaor is a de)ice !a is used %i! alernatng curren moors o . A. boos !e sul2 )olage during sartng eriods B. comensae &or lo% o%er &acor %!en moor is no &ull2 loaded C. reduce !e sul2 )olage during sartng eriods -. comensae &or )olage dro in !e circui 4. EE Board Exam Aril 199' A single0 !ase moor ro)ided %i! a suirrel cage %inding on is roor in additon o is regular %inding is called A. sli0!ase inducton moor B. reulsion inducton moor C. uni)ersal moor -. reulsion0sar inducton moor 49. EE Board Exam Aril 199' A es used o deermine !e eui)alen resisance o& an inducton moor is A. no0load es B. s!or circui es C. blocked roor es -. olari2 es "(. EE Board Exam Aril 1991 Raid soing o& a moor b2 momenaril2 connectng !e moor in re)erse directon is called A. ;ogging B. inc!ing C. lugging -. seuence oeraton "1. EE Board Exam Ocober 199( Reeaed sartng and soing o& a moor is re&erred o as A. seing B. ;ogging C. !asing -. none o& !ese
"'. EE Board Exam Nune 199( An inducton moor dri)en abo)e s2nc!ronous seed is called A. inducton regulaor B. &reuenc2 c!anger C. inducton generaor -. !ase con)erer Fnsol)ed roblems "/. REE Board Exam 5eember '((4 Hn an inducton moor# %!a is !e ercen sli i& !e seed is /#"1(+ A. 1 C. ' B. 1." -. '." "4. REE Board Exam 5eember '((' 8!e seed o& an inducton moor is 117( rm. *!a is !e &reuenc2 o& !e roor curren+ A. '." 6 C. 1." 6 B . /7." 6 -. /./ 6 "". REE Board Exam 5eember '((' A /0!ase# ''( )ol inducton moor !a)ing a o%er &acor o& (. !as /$ losses. -eermine !e curren dra%n b2 !e moor. A. '".'/ A C. '(.1 A B. 4/.,9 A -. 14.", A ",. REE Board Exam Aril '((' A !ree0!ase suirrel cage moor is sared b2 %2e0dela sarer. *!a s!all be is sartng orue relat)e o is raed )olage sartng orue+ A. //./$ C. "7.7$ B. 4'./$ -. 1(($ ,,. Regarding ske%ing o& moor bars in a suirrel0 "7. ECE Board Exam o)ember 1999 6o% do 2ou call !e seed o& an alernatng curren ACP inducton moor+ A. ar2ing sul2 &reuenc2 B. ar2ing series resisance o& !e Ield C. ar2ing sul2 )olage -. ar2ing bo! !e sul2 )olage and &reuenc2 a !e same tme ". ECE Board Exam o)ember 199" 8!e bes %a2 o conrol !e seed o& an AC inducton moor is b2 )ar2ing !e . A. sul2 &reuenc2 B. bo! sul2 )olage and &reuenc2 simulaneousl2 C. sul2 )olage -. series resisance o& !e Ield "9. ECE Board Exam o)ember 1997 A %o ole# !ree !ase moor !as Ield oles. A. , C. ' B. -. 4 ,(. ECE Board Exam o)ember '((1 re&ers o an AC generaor. A. Commuaor C. B. Moor ACP -. Roor Alernaor ,1. ECE Board Exam o)ember '((( 5eries moors oeraed on ei!er AC or -C are sometmes called . A. Fni)ersal moors B. eneral moors C. Ba)arian moors -. Anglo moors ,'. ECE Board Exam Aril '((1 *!a does !e erm single0!ase indicae+ A. One inu B. One curren one inuP C. One tme -. One )olage one inuP ,/. ECE Board Exam o)ember 199, ind o& AC0moor# lig! load !ig! load lo% seed. A. 52nc!ronous moor B. 5uirrel cage moor C. 5li !ase moor -. Fni)ersal moor ,4. ECE Board Exam o)ember 199, A %o ole# one !ase moor !as Ield oles. A. C. , B. ' -. 4 ,". *!a is !e ercen sli o& a 40ole inducton moor i& !e ouu seed is 1#7"" rm+ A. / C. '." B. " -. 4 cage inducton moor# 5CHMP %!ic! saemen is &alse. A. i re)ens cogging B. i increases sartng orue C. i roduces more uni&orm orue -. i reduces moor S!umL during is oeraton ,7. 8!e rincile o& oeraton o& a /0!ase inducton moor is mos similar o !a o& a A. s2nc!ronous moor B. reulsion0sar inducton moor C. rans&ormer %i! a s!ored secondar2 -. caacior0sar# inducton0run moor ,. 8!e magneting curren dra%n b2 rans&ormers and inducton moors is !e cause o& !eir o%er &acor. A. ero C. lagging B. uni2 -. leading ,9. 8!e eec o& increasing !e leng! o& air0ga in an inducton moor %ill be o increase !e A. o%er &acor B. seed C. magneting curren -. air0ga Tux 7(. Hn a /0!ase inducton moor# !e relat)e seed o& saor Tux %i! resec o is ero. A. saor %inding C. roor Tux B. roor -. sace 71. An eig! ole %ound roor inducton moor oeratng on ,( 6 sul2 is dri)en a 1(( r..m. b2 a rime mo)er in !e oosie directon o& re)ol)ing magnetc Ield. 8!e &reuenc2 o& roor curren is A. ,( 6 B. 1'( 6 C. 1( 6 -. none o& !e abo)e 7'. A /0!ase 4 ole# "( 6 inducton moor runs a a seed o& 144( r..m. 8!e roatng Ield roduced b2 !e roor roaes a a seed o& r..m. %i! resec o !e roor. A. 1"(( C. ,( B. 144( -. ( 7/. Hn a /0 inducton moor# !e roor Ield roaes a s2nc!ronous seed %i! resec o A. saor B. roor C. saor Tux -. none o& !e abo)e 74. Hrresect)e o& !e sul2 &reuenc2# !e orue de)eloed b2 a 5CHM is !e same %!ene)er is !e same. A. sul2 )olage B. exernal load C. roor resisance -. sli seed 7". 8!e number o& saor oles roduced in !e roatng magnetc Ield o& a /0U inducton moor !a)ing / slos er ole er !ase is A. / C. ' B. , -. 1' 7,. 8!e o%er &acor o& a suirrel0cage inducton moor is A. lo% a lig! loads onl2 B. lo% a !ea)2 loads onl2 C. lo% a lig! and !ea)2 loads onl2 -. lo% a raed load onl2 77. *!ic! o& !e &ollo%ing roor uant2 in a 5CHM does O8 deend on is sli+ A. reacance B. seed C. induced em& -. &reuenc2 moor deends on !e &ollo%ing !ree &acors< A. seed# &reuenc2# number o& oles B. )olage# curren and saor imedance C. s2nc!ronous seed# roor seed and &reuenc2 -. roor em&# roor curren and roor .&. 7. H& !e saor )olage and &reuenc2 o& an inducton moor are reduced
roortonael2# is A. locked roor curren is reduced B. orue de)eloed is increased C. magneting curren is decreased -. bo! A and B . 8!e e3cienc2 and .&. o& a 5CHM increases in 7. A ,0ole# "(06# /0 inducton moor is running a 9"( rm and !as roor Cu loss o& " k*. Hs roor inu is k*. A. 1(( C. 9" B. 1( -. "./ 79. 8!e e3cienc2 o& a /0!ase inducton moor is aroximael2 roortonal o A. 1 D sP C. B. s -. ,. 8!e orue de)eloed b2 a /0!ase inducton s roorton o is A. seed B. mec!anical load C. )olage -. roor orue 9. A 5CHM runs a consan seed onl2 so long as A. B. C. -. orue de)eloed b2 i remains consan is sul2 )olage remains consan is orue exacl2 euals !e mec!anical load saor Tux remains consan 9(. 8!e s2nc!ronous sed o& a linear inducton (. A ,0 ole# "(06# /0 inducton !as a &ull0load seed o& 9"( rm. A !al& load# is seed %ould be rm. A. 47" C. 97" B. "(( -. 1((( 1. H& roor inu o& a 5CHM running %i! a sli o& 1($ is 1(( k*# gross o%er de)eloed b2 is roor is k*. A. 1( C. 99 B. 9( -. ( '. :ull0ou orue o& a 5CHM occurs a !a )alue o& sli %!ere roor o%er &acor euals A. uni2 C. (.,, B. (.7(7 -. (." /. *!en alied raed )olage er !ase is reduced b2 one0!al&# !e sartng orue o& a 5CHM becomes o& !e sartng orue %i! &ull )olage. A. V C. B. W -. 4. H& maximum orue o& an inducton moor is '(( kg0m a a sli o& 1'$# !e orue a ,$ sli %ould be kg0m. A. 1(( C. "( B. 1 ,( -. 4( ". 8!e &ractonal sli o& an inducton moor is !e rato A. roor Cu lossKroor inu B. saor Cu lossKsaor inu C. roor Cu lossKroor ouu -. roor Cu lossKsaor Cu loss moor does O8 deend on A. %id! o& ole ic! B. number o& oles C. sul2 &reuenc2 -. an2 o& !e abo)e 91. 8!rus de)eloed b2 a linear inducton moor deends on A. s2nc!ronous seed B. roor inu C. number o& oles -. bo! A and B 9'. 8!e saor o& a /0!ase inducton moor roduces magnetc Ield. A. sead2 B. roatng C. alernatng -. none o& !ese 9/. An inducton moor is re&erred o a dc moor because i A. ro)ides !ig! sartng orue B. ro)ides Ine seed conrol C. !as simle and rugged consructon -. none o& !e abo)e 94. A /0!ase inducton moor is A. essentall2 a consan seed moor B. a )ariable seed moor C. )er2 cosl2 -. no easil2 mainainable 9". 8!e air ga be%een saor and roor o& a /!ase inducton moor ranges &rom A. B. C. -. ' cm o 4 cm (.4 mm o 4 mm 1 cm o ' cm 4 cm o , cm 1(4. H& !e inducton moor s!o%n in =ig. ,.1 runs a 9,. H& !e &reuenc2 o& /0!ase sul2 o !e saor o& a /0!ase inducton moor is increased# !e s2nc!ronous seed A. is decreased B. is increased C. remains unc!anged -. none o& !e abo)e 97. H& s is !e seed o& roatng Tux and r !e seed o& !e roor# !en !e rae a %!ic! !e Tux cus !e roor conducors is direcl2 roortonal o A. s C. s D r B. r -. r D s 9. Hn a /0 !ase inducton moor# !e roor seed is !e s2nc!ronous seed. A. greaer !an B. smaller !an C. eual o -. none o& !ese moor !a)ing '( oles and conneced o a "( 6 source is A. ,(( rm C. 1'(( rm B. 1((( rm -. /(( rm 1((. 8!e relaton among s2nc!ronous seed sP# roor seed rP and sli sP is A. r > s D 1Ps B. r > 1 D sPs C. r > 1 G sPs -. r > ss !e moor is a sandstll. A. ero B. '" 6 C. "( 6 -. none o& !ese 1(,. H& one o& !e lines in =ig. ,.1 is inerc!anged# !en A. Tux seed increases B. Tux seed decreases C. Tux seed remains !e same bu directon is re)ersed -. none o& !e abo)e seed o& 1"(( rm# !en sul2 &reuenc2 is A. "( 6 B. '" 6 C. ,( 6 -. none o& !ese 1(. 8!e &ull0load sli o& a /0!ase inducton moor ranges &rom A. 1($ o '($ B. '($ o /($ C. '$ o "$ -. none o& !ese 1(9. 8!e directon o& roaton o& Ield in a /0!ase 1(1. *!en a /0!ase inducton moor is a no load# !e sli is A. 1 B. (." C. ractcall2 ero -. (.' inducton moor deends uon A. number o& oles B. magniude o& sul2 )olage C. sul2 &reuenc2 -. !ase seuence o& sul2 )olage 11(. 8!e roor %inding o& a /0!ase %ound roor 1('. *!en !e roor o& a /0!ase inducton moor is blocked# !e sli is A. ero B. (." C. -. (.1 1 1(/. 8!e seed o& !e roatng Tux in =ig. ,.1 %ill be /0!ase sul2 "( 6X :>4 /0:!ase Hnducton Moor =ig. ,.1 1"(( rm 1((( rm 7"( rm none o& !ese 1(". Hn =ig. ,.1# !e roor &reuenc2 is %!en 1(7. H& a 40ole inducton moor !as a s2nc!ronous 99. 8!e s2nc!ronous seed o& a /0!ase inducton A. B. C. -. 14"( rm# !en sli is A. "($ B. /./$ C. "$ -. none o& !ese inducton moor is generall2 conneced. A. sar B. dela C. arl2 sar arl2 dela -. none o& !e abo)e 111. /0 !ase %ound roor moors are also called moors. A. s2nc!ronous B. sli ring C. series -. commuaor 11'. 8!e ad)anage o& %ound roor moor is !a A. B. C. -. i is inexensi)e i reuires less
mainenance exernal resisance can be insered in !e roor circui none o& !e abo)e 11/. A %ound roor moor is mainl2 used in alicaton %!ere A. a !ig! sartng orue is reuired B. seed conrol is no reuired C. less cosl2 moor is reuired -. !ig! roor resisance is reuired during running 114. 8!e orue c!araceristc o& a /0!ase inducton moor is similar o !a o& A. dc series moor B. dc s!un moor C. dc dierentall2 comounded moor -. dc cumulat)el2 comounded moor 11". Hn a %ound roor moor# !e roor %inding is %ound &or oles !a o& !e saor %inding. A. eual o B. greaer !an C. smaller !an -. none o& !ese 11,. *ound roors are less exensi)el2 used !an suirrel cage moor because A. sli rings are reuired on !e roor circui B. roor %indings are generall2 0conneced C. !e2 are cosl2 are reuired greaer mainenance -. none o& !e abo)e 117. A 40ole# "( 6 inducton moor oeraes a "$ sli. 8!e &reuenc2 o& em& induced in !e roor %ill be A. '" 6 B. "( 6 C. '." 6 -. none o& !ese 11. 8!e maximum )olage is induced in !e roor o& a /0!ase inducton %!en i A. runs a no0load B. runs a &ull0load C. is blocked -. none o& !ese 119. 8!e reacance o& !e roor circui o& a /0!ase inducton moor is maximum a A. no0load B. &ull0load C. !al& &ull0load -. sartng 1'(. 8!e roor curren in a /0!ase inducton moor is sli. A. in)ersel2 roortonal o B. direcl2 roortonal o C. indeenden o& -. none o& !ese 1'1. A sartng# roor reacance o& a /0!ase inducton moor is roor resisance. A. small as comared o B. eual o !a o& C. large as comared o -. none o& !e abo)e 1''. *!en an inducton moor is running a &ull0load# roor reacance is roor resisance. A. comarable o B. )er2 large comared o C. large comared o -. none o& !e abo)e 1'/. H& !e sli o& a /0!ase inducton moor increases# !e .&. o& !e roor circui A. is increased B. is decreased C. remains unc!anged -. none o& !e abo)e 1'4. 8!e magneting c urren dra%n b2 a /0 !ase inducton moor is abou o& &ull0load saor curren. A. "$ C. 1" o '($ B. 1( o 1"$ -. /( o "($ 1'". A !ig! sartng orue can be obained in a /!ase inducton moor b2 A. increasing roor resisance B. decreasing roor resisance C. increasing roor reacance -. none o& !e abo)e 1',. 8!e sartng orue o& a /0!ase inducton moor is sul2. A. indeenden o& B. direcl2 roortonal o C. direcl2 roortonal o !e suare o& -. none o& !e abo)e 1'7. 8!e sartng orue o& an inducton moor is maximum %!en roor resisance er !ase is roor reacanceK!ase. A. eual o B. %o tmes C. &our tmes -. none o& !ese 1'. Fnder running conditons# !e maximum orue o& /0!ase inducton moor %ill occur a !a )alue o& sli a %!ic! roor resisanceK!ase is roor reacanceK!ase. A. %o tmes B. &our tmes C. eual o -. none o& !ese 1'9. 8!e maximum orue o& a /0!ase inducton moor under running conditons is A. in)ersel2 roortonal o sul2 )olage B. in)ersel2 roortonal o roor reacance a sandstll C. direcl2 roortonal o roor resisance -. none o& !e abo)e 1/(. H& !e sul2 )olage o& a /0!ase inducton moor is increased %o tmes# !en orue is A. increased %o tmes B. decreased %o tmes C. increased &our tmes -. decreased &our tmes 1/1. 8!e /0!ase inducton moor is so designed !a !e roor s!ould !a)e under running conditons. A. !ig! resisance B. !ig! reacance C. large sli -. lo% resisance -. none o& !ese 141. Hn a suirrel cage roor# !e bars are no laced o !e s!a? bu are ske%ed o !a)e A. greaer mec!anical sreng! B. less roor losses C. uni&orm orue -. none o& !e abo)e 1/'. H& a /0!ase inducton moor is running a sli s in decimalP !en roor coer loss is eual o A. 1 D sP x roor inu B. 1 G sP x roor inu C. s x roor inu -. none o& !ese 14'. Hn a suirrel cage moor# !e number o& saor slos is roor slos. A. al%a2s eual o !e number o& B. al%a2s greaer !an !e number o& C. al%a2s less !an !e number o& -. ei!er more or less !an !e number o& 1//. H& an inducton moor is running a sli s in decimalP !en roor ouu is eual o A. 1 G sP x roor inu B. s 0 1P x roor inu C. s x roor inu -. 1 D sP x roor inu 14/. H& !e air ga be%een !e roor and saor o& /!ase inducton moor is increased !en A. no0 load curren is decreased B. leakage reacances are decreased C. leakage reacances are increased -. none o& !e abo)e 1/4. H& s and r are !e seeds o& roatng Ield and roor resect)el2# !e rato roor inuKroor ouu is eual o A. rKs C. s 0 r B. sKr -. r D s 1/". A no0load# !e roor core loss o& a /0!ase inducton moor is A. large B. small C. ractcall2 small -. none o& !e abo)e 1/,. = ricton and %indage loss o& a /0!ase inducton moor are A. maximum a no load B. minimum a no load C.
remains !e same a all loads -. none o& !e abo)e 1/7. =or !ig!er e3cienc2 o& /0!ase inducton moor# !e sli s!ould be A. large B. )er2 large C. as small as ossible -. 1 1/. H& a /0!ase inducton moor is running a a sli s in decimalP# !en aroximae e3cienc2 o& !e moor is ' A. s C. s 0 1 B. 1 G s -. 1 0 s 144. H& !e sli o& inducton moor increases# !en curren in !e saor %inding A. is increased B. is decreased C. remains unc!anged -. none o& !e abo)e 14". 8!e conditons o& an inducton moor a no0 load resemble !ose o& a rans&ormer %!ose secondar2 is A. s!or0circuied B. oen0circuied C. sul2ing a )ariable resist)e load -. none o& !e abo)e 14,. 8!e conditons o& an inducton moor a sandstll resemble !ose o& a rans&ormer %!ose secondar2 is A. s!or0circuied B. oen0circuied C. sul2ing a )ariable resist)e load -. none o& !e abo)e 147. 8!e conditons o& an inducton moor on load resemble !ose o& a rans&ormer %!ose secondar2 is A. s!or0circuied B. oen0circuied C. sul2ing a )ariable resist)e load -. none o& !e abo)e 14. 8!e seed o& a suirrel cage inducton moor is 1/9. A /0!ase inducton moor is running a '$ sli. H& !e inu o roor is 1((( *# !en mec!anical o%er de)eloed b2 !e moor is A. '( * C. "(( * B. 9( * -. '(( * 14(. 8!e aroximae e3cienc2 o& a /0!ase "( 6# 40ole inducton moor running a 1/"( rm is A. 9($ B . 4($ C. ,"$ c!anged b2 A. ole c!anging B. r!eosatc conrol C. cascade conrol -. none o& !ese 149. One o& !e seeds o& a '0seed suirrel cage inducton moor is (( rm lo%er seedP. 8!e o!er seed %ould be A. 4(( rm C. 1,(( rm B. '4(( rm -. 1'(( rm 1"(. A &our seed suirrel cage inducton moor uses saor %indings. A. &our B. !ree C. -. one %o A. B. C. -. suirrel cage %ound ei!er A or C none o& !ese 1,(. =or !e same ratng# !e sie o& a single0!ase 1"1. Hn a double suirrel cage inducton moor# !e ouer cage %inding !as A. !ig! inducance B. lo% resisance C. !ig! resisance -. none o& !ese 1"'. A sartng o& a double suirrel cage inducton moor A. lo%er cage %inding !as lo% reacance B. ouer cage %inding !as good .&. C. lo%er %inding is more eect)e -. none o& !e abo)e inducton moor is abou !a o& !e corresonding /0!ase inducton moor. A. / tmes C. 1." tmes B. !e same as -. (.// tmes 1,1. =or !e same ratng# !e .&. o& a single0!ase inducton moor is abou !a o& !e corresonding /0!ase inducton moor. A. !e same as B. less !an C. more !an -. none o& !ese 1,'. =or !e same ratng# !e e3cienc2 o& a single1"/. er2 large /0!ase inducton moors Y '" 6:P are sared A. direc on line B. sar0dela sartng C. b2 auorans&ormer sartng -. none o& !e abo)e 1"4. H& !e roor slos are made deeer# roor resisance is A. increased a sartng B. decreased a sartng C. increased under running conditon -. none o& !e abo)e 1"". Hn a suirrel cage inducton moor# !e number o& roor bars is generall2 A. e)en number B. eual o saor oles C. rime number -. none o& !ese 1",. Hn a suirrel cage inducton moor# !e maximum orue de)eloed under running conditons is A. eual o sartng orue B. &ull0load orue C. less !an sartng orue -. muc! !ig!er !an &ull0load orue 1"7. Hn a %ound roor inducton moor# !e exernal resisance is so ad;used in !e roor circui !a maximum orue de)eloed is A. eual o is sartng orue B. eual o is &ull0load orue C. less !an is &ull0load orue -. none o& !e abo)e 1". =or !e same kA ratng# !e leakage Tux in inducton moor is !a o& rans&ormer. A. more !an B. less !an C. abou !e same -. none o& !ese 1"9. A single0!ase inducton moor emlo2s roor. !ase inducton moor is abou !a o& !e corresonding /0!ase inducton moor. A. less !an B. !e same as C. more !an -. none o& !ese 1,/. 8!ree0!ase inducton moors are %idel2 used &or indusrial alicatons because A. !e2 are rugged in consructon# reuires less mainenance and are less exensi)e !an o!er moors B. !eir seed can be conrolled )er2 smoo!l2 o)er a %ide range C. !eir oeratng c!araceristcs are suerior o)er o!er elecrical moors -. !e2 can be manu&acured easil2 &or an2 ! ratng 1,4. Hn a !ree0!ase inducton moor A. !ree0!ase sul2 is o be gi)en o saor %inding and dc sul2 o !e roor %inding B. onl2 !ree0!ase sul2 is o be gi)en o saor %inding C. !ree0!ase sul2 is o be gi)en o bo! saor and roor %indings -. !ree0!ase sul2 is o be gi)en o roor %inding 1,". 8!e saor and roor cores o& an inducton moor are made u o& laminaed s!ees A. o reduce !e !2seresis loss in !e core B. o reduce !e edd20curren loss in !e core C . o make !e roor and saor mec!anicall2 srong -. o enable !e saor and roor cores dissiae !ea more eect)el2 1,,. 8!e saor and roor cores o& an inducton
moor are made u o& magnetc maerial A. o kee !e cos o& consructon lo% B. o reduce !e magneting curren C. o make !e ars srong -. because !e relucance o& !e magnetc maerial is srong 1,7. Hn %ound0roor 2e inducton moors !e roor erminals are broug! ou !roug! sli rings A. o enable exra resisance o be conneced across !em during sartng B. o enable closing !e roor circui exernall2 C. o enable !ree0!ase sul2 o be alied across !e roor %inding !roug! rus! and sli0ring arrangemen -. o enable connectng !e roor %indings ei!er in sar or in dela deending uon !e need 1,. A ulsatng alernatngP magnetc Ield %ill be roduced %!en A. %o0!ase sul2 is alied across a %o!ase saor %inding B. !ree0!ase sul2 is alied across a !ree0!ase saor %inding C. a ol2!ase sul2 is alied across a ol2!ase saor %inding -. a single0!ase sul2 is alied across a single0!ase saor %inding 1,9. 8o make !e simles ,0ole saor %inding# a leas A. %o coils are needed B. one coil is needed C. !ree coils are needed -. six coils are needed 17(. 8!e directon o& !e roatng magnetc Ield roduced b2 !e saor amere0urns o& a !ree!ase inducton moor c!anges i& A. !e seuence o& !e sul2 o !e saor erminals is c!anged B. a )ariable &reuenc2 )olage is alied across !e saor erminals C. !e sul2 )olage is c!anged -. sul2 o an2 one !ase is disconneced 171. A 4((0# "(06# 40ole# !ree0!ase inducton moor canno run a 1"(( rm because A. a 1"(( rm !ere %ill be no em& induced in !e roor circui !ence no orue %ill be roduced B. an inducton moor can run onl2 a a seed !ig!er !an is s2nc!ronous seed C. a 1"(( rm# orue de)eloed b2 !e roor ma2 no be su3cien o roae !e roor -. a 1"(( rm# !e roor %ill dra% excessi)e curren and ma2 be !arm&ul o !e moor 17'. A 4((0# "(06 !ree0!ase inducton moor roaes a 144( rm on &ull0load. 8!e moor is %ound &or A. '0oles C. ,0oles B. 40oles -. 0 oles 17/. 8!e sli o& a 4((0# !ree0!ase# 40ole inducton moor %!en roatng a 144( rm is A. ' er cen C. 4 er cen B. / er cen -. " er cen 174. 8!e relaton be%een s2nc!ronous seed# saor sul2 &reuenc2 and saor number o& oles o& a !ree0!ase inducton moor is gi)en b2 A. C. B. -. 17". *!en a 4((0# "(06# ,0ole inducton moor is roatng a 9,( rm on no0load# is sli is A. 1 er cen C. / er cen B. ' er cen -. 4 er cen 17,. 8!e orue0sli c!araceristc &or a !ree0!ase inducton moor is suc! !a A. &or lo%er )alues o& sli# orue is direcl2 roortonal o sli and &or !ig!er )alues o& sli# orue is in)ersel2 roortonal o sli B. &or lo%er )alues o& sli# orue is in)ersel2 roortonal o sli and &or !ig!er )alues o& sli# orue is direcl2 roortonal o sli C. &or lo%er )alues o& sli# orue is direcl2 roortonal o !e suare o& !e sli and &or !ig!er )alues o& sli# orue is in)ersel2 roortonal o sli -. &or lo%er )alues o& sli# orue is direcl2 roortonal o !e sli and &or !ig!er )alues o& sli# orue is in)ersel2 roortonal o suare o& sli 177. 8orue de)eloed b2 a !ree0!ase# 4((0 inducton moor is 1(( 0m. H& !e alied )olage is reduced o '((0# !e de)eloed orue %ill be A. "( 0m C. '(( 0m B. ' " 0m -. ,'." 0m 17. H& !e roor circui resisance o& a !ree0!ase inducton is increased A. is sartng orue %ill increase and !e maximum orue de)eloed %ill also increase B. bo! !e sartng orue and maximum orue %ill remain unc!anged C. is sartng orue %ill increase bu !e maximum orue de)eloed %ill decrease -. is sartng orue %ill increase bu !e maximum orue de)eloed %ill remain unc!anged 179. 8o ac!ie)e !ig!er sartng orue in a !ree0 !ase sli0ring 2e inducton moor A. exra resisance s!ould be conneced ac ross !e sli0rings erminals B. !e !ase seuence o& !e sul2 o !e moor s!ould be re)ersed C. !e sul2 )olage s!ould be increased -. !e %indings s!ould Irs be conneced in sar and !en in dela 1(. =or a !ree0 !ase inducton moor !a)ing roor circui resisance o& , . Maximum orue occurs a a sli o& (.,. 8!e )alue o& sandstll roor circui reacance is A. 4.44 C. 1 Z B. (./, -. 1( Z 11. *!ile sartng a !ree0 !ase inducton moor# a sar0dela sarer is used o A. reduce !e sartng curren o a sa&e )alue B. ac!ie)e !ig!er sartng orue C. enable !e moor o sar in !e rig! directon -. be able o re)erse !e directon o& roaton o& !e roor as and %!en necessar2 1'. A dela0conneced 4((0# "(06# !ree0 !ase inducton moor %!en sared direc0on0line akes a sartng curren o& /( A. *!en !e moor is sared !roug! a sar0dela sarer. 8!e sartng curren %ill be A. / A C. 1" A B. 1( A -. /( A 1/. 8!e magneting curren a !ree0!ase inducton moor is muc! !ig!er !an !e eui)alen rans&ormer
because A. !e sie o& an inducton moor is !ig!er !an an eui)alen rans&ormer B. o& !e resence o& air0ga be%een saor and roor in an inducton moor C. grain oriened magnetc maerial is used &or !e core o& an inducton moor -. in&erior magnetc maerial is used &or !e core o& an inducton moor 14. 5moo! seed conrol o& a !ree0!ase inducton moor o)er a %ide range is ossible# b2 A. ole c!anging me!od B. &reuenc2 conrol me!od C. using conseuen ole ec!niue -. b2 )olage conrol me!od 1". 8!e o%er inu in blocked0roor es er&ormed on a !ree0!ase inducton moor is aroximael2 eual o A. !2seresis loss in !e core ' B. H R loss in !e %indings C. edd20curren loss in !e core -. iron0loss in !e core 1,. 8!e o%er inu in no0load es er&ormed on a !ree0!ase inducton moor is aroximael2 eual o A. !2seresis loss in !e core ' B. H R loss in !e %indings C. edd20curren loss in !e core -. iron0loss in !e core 17. Hn !e eui)alen circui o& a !ree0!ase inducton moor !e mec!anical load on !e moor can be reresened b2 a resisance o& )alue A. C. B. -. 1. 8!e !enomenon o& suirrel0cage moors sometme s!o%ing endenc2 o run a a )er2 lo% seed is kno%n as A. cogging C. daming B. cra%ling -. ske%ing 19. 8!e seed o& re)ol)ing Ield &or a "(06# 0 ole mac!ine %ill be A. 1"(( rm B. 144( rm C. -. 1((( rm 7"( rm 19(. 8!e orue de)eloed b2 an inducton moor is A. direcl2 roortonal o !e suare o& !e roor resisance B. direcl2 roortonal o !e suare o& !e sul2 )olage C. in)ersel2 roortonal o !e sul2 )olage -. in)ersel2 roortonal o !e sli 191. 8!e o%er &acor o& an inducton moor %ill be !ig! %!en A. running a no0 load B. running a &ull0load C. roor is blocked -. !e roor is cra%ling 19'. A "0!# !ree0!ase# 4((0 sar0conneced suirrel0cage inducton moor mean o dri)e a milling mac!ine# a sartng akes abou A. 4( A C. 1"( A B. 1(( A -. '(( A 19/. 8!e sartng orue o& an inducton moor can be increased b2 A. increasing !e roor reacance B. increasing !e roor resisance C. increasing !e sul2 &reuenc2 -. gi)ing sul2 !roug! sar0dela sarer 194. =or a gi)en !ree0!ase inducton moor# maximum orue %ill be de)eloed a sartng i& !e roor arameers are as &ollo%s< A. R' > ' # [' > B. R' > 4 # [' > C. R' > # [' > -. R' > 1, # [' > 19". 8!e seed o& a !ree0!ase inducton moor %ill increase i& !e A. number o& oles o& !e saor %inding is increased B. number o& oles o& !e saor %inding is decreased C. &reuenc2 o& !e saor sul2 is decreased -. resisance o& !e roor circui is increased 19,. Hnducton moors no%0a0da2s use die0cas aluminum roor because A. aluminum is lig!er !an coer B. aluminum is c!eaer !an coer C. aluminum is eas2 o cas because o& lo% meltng oin and is easil2 a)ailable -. aluminum !as less resist)i2 !an coer 197. *!en !e roor circui resisance o& a ol2!ase inducton moor is increased A. !e saring orue increases B. !e maximum )alue o& orue decreases C. !e sli a %!ic! maximum orue occurs remains unc!anged -. maximum orue is de)eloed a sartng 19. Hn an inducton moor !e roor resisance and reacance are (.' o!m and " o!m resect)el2. Hn order !a !e orue o& !e moor ma2 be a maximum# !e )alue o& sli s!ould be eual o A. 1($ C. 4$ B. $ -. 1$ 199. *!a %ill !aen i& !e air ga in an inducton moor is increased+ A. !e %indage losses %ill increase B. !e magneting curren o& !e roor %ill decrease C. !e o%er &acor %ill decrease -. !e seed o& !e moor %ill increase '((. An inducton moor is said o be cra%ling i& A. B. C. -. i acceleraes oo &as i is sared on &ull load i is sub;eced o Tucuatng load i runs a 1( o 1" ercen o& raed seed '(1. A. B. C. -. 5H\E :6A5E MO8OR5 '('. Mos o& single0!ase inducton moors are mac!ines. A. ' ole C. ole B. , ole -. 4 ole '(/. 8!e main %inding and sartng %inding o& a single 0!ase inducton moor are conneced in across !e sul2. A. series B. arallel C. series0arallel -. none o& !ese '(4. 8!e sartng %inding o& a single0!ase inducton moor !as !a o& !e main %inding. A. more oles !an B. less oles !an C. same number o& oles -. none o& !e abo)e '(". A "( 6# 4 ole single0!ase inducton moor %ill !a)e a s2nc!ronous seed o& A. 1"(( rm B. 7"( rm C. 1'(( rm -. none o& !ese '(,. A 4 ole# "( 6 single0!ase inducton moor !as a sli o& "$. 8!e seed o& !e moor %ill be A. 1"(( rm B. 14'" rm C. 1'(( rm -. none o& !ese '(7. Hn a single0!ase inducton moor# seed sensit)e cenri&ugal s%ic! is conneced in %inding. A. arallel %i! main B. series %i! main C. series %i! sartng -. arallel %i! sartng '(. 8!e urose o& sartng %inding in a single0 !ase inducton moor is o A. reduce losses B. limi emeraure rise o&
!e mac!ine C. roduce roatng Tux in con;uncton %i! main %inding -. none o& !e abo)e '(9. H& Hm and Hs are !e curren in !e main and sartng %indings resect)el2 and ] is !e angle be%een Hm and Hs# !en moor orue 8 is gi)en b2 A. 8 ] Hm H s cos ] B. 8 ] Hm Hs sin ] C. 8 ] Hm Hs -. none o& !ese '1(. Hn !e resisance sli0!ase inducton moor s!o%n in =ig. 1# !e angle ] be%een Hm and Hs is abou A. ( degrees B. ," degrees C. -. 7" degrees '" degrees '11. 8!e sartng %inding o& a sli0!ase inducton moor s!o%n in =ig. 1 is disconneced %!en !e moor a@ains abou o& s2nc!ronous seed. A. 7"$ C. '"$ B. "($ -. 1(($ '1'. Hn !e resisance sli0!ase inducton moor s!o%n in =ig. 1# !e main %indings !as A. !ig! resisance and !ig! inducance B. !ig! resisance and lo% inducance C. lo% resisance and !ig! inducance -. lo% resisance and lo% inducance '1/. A sartng# !e curren Hs in !e sartng %inding s!o%n in =ig. 1 A. lags b2 9( degrees B. leads b2 9( degrees C. is nearl2 in !ase %i! -. leads b2 7" degrees '14. A resisance sli0!ase inducton moor is used &or A. lo% inerta loads B. !ig! inerta loads C. )er2 !ig! inerta loads -. none o& !e abo)e '1". 8!e directon o& sli0 !ase inducton moor can be re)ersed b2 inerc!anging !e connectons o& sul2 o& A. ei!er main or sartng %inding B. bo! main and sartng %inding C. roor %inding -. none o& !e abo)e '1,. 8!e resisance sli0!ase inducton moor !as sartng orue. A. B. C. -. !ig! moderae )er2 lo% none o& !ese ''". 8!e caacior0sar# caacior0run inducton moor acs as a rue '0!ase moor a A. sartng C. all loads B. no load -. &ull load '17. 8!e resisance sli0!ase inducton moor is C. used in !ose alicatons %!ere A. sartng is &reuen B. sartng eriod is long sartng is in&reuen -. none o& !e abo)e '',. 8!e caacior0sar# caacior0run moor is used in !ose alicatons %!ere A. !ig!l2 sartng orue is reuired B. silence is imoran C. nois2 oeraton is no imoran -. none o& !e abo)e '1. 8!e resisance sli0!ase inducton moors are !e mos oular single0!ase inducton moors because o& A. !eir lo% cos B. !eir !ig! sartng orue C. !e long sartng eriod -. none o& !e abo)e '19. Hn !e caacior sar inducton moor s!o%n in =ig. '# !e angle ] be%een Hm and Hs is ''7. 8!e caacior0sar# caacior0run moor !as A. B. C. -. no cenri&ugal s%ic! lo% o%er &acor nois2 oeraton lo% e3cienc2 ''. Caacior moors resisance sli0!ase inducton moors. A. are coslier !an B. are less cosl2 !an C. cos abou !e same as -. oor sartng orue !an ''9. Mos o& !e roubles o& single0!ase inducton A. exacl2 9(^ B. abou /(^ C. -. abou 4(^ abou 7"^ ''(. 8!e )alue o& Hs in caacior0sar moor s!o%n in =ig. ' is !e curren Hm. A. eual o B. less !an !a o& C. more !an !a o& -. none o& !e abo)e '/(. 8!e single0!ase s!aded ole moor !as A. B. C. -. ''1. 8!e caacior C used in !e caacior0sar moor s!o%n in =ig. ' is al%a2s a caacior. A. aer B. ceramic C. -. mica elecrol2tc '''. A sartng# !e line curren o& a caacior0sar inducton moor is normal &ull0load curren. A. o 1( tmes B. 4 o " tmes C. eual o -. 7 o tmes ''/. Hn a caacior0sar# caacior0run moor# %inding is cu0ou a?er sartng. A. sartng B. main C. nei!er A or B -. none o& !ese ''4. A caacior0sar# caacior0run moor !as A. B. C. -. lo% o%er &acor !ig! o%er &acor lo% e3cienc2 !ig! sartng orue moor are raceable o !e A. roor bars B. main %inding C. s!a? bearings -. sartng s%ic! suirrel cage roor %ound roor !ig! o%er &acor !ig! sartng orue '/1. 8!e directon o& roaton o& s!aded ole moor deends uon A. sul2 &reuenc2 B. number o& oles on !e saor C. %!ic! !al& o& !e ole is s!aded -. sul2 )olage '/'. 8!e &ull0load e3cienc2 o& a s!aded ole moor is abou A. 7( o ($ B. ,( o 7($ C. -. /( o /"$ " o 1($ '//. 8!e single0!ase series moor can oerae on A. B. C. -. ac onl2 dc onl2 bo! ac and dc none o& !ese '/4. =or !e same ratng# a dc series moor coss single !ase series moor. A. abou !e same as B. more !an C. less !an -. none o& !ese '/". A ' 6: dc series moor %ill %eig! ' 6: single0!ase series moor. A. abou !e same as B. less !an C. more !an -. none o& !ese B. C. -. '/,. A )acuum cleaner emlo2s moor. A. B. C. -. resisance sli0!ase caacior sar s!aded0ole single0!ase series '/7. 8!e bes suied moor o dri)e a 1K4 6: &an in a !osial %ould be moor. A. s!aded ole B. single0!ase series C. caacior run -. !2seresis '/. 8!e %as!ing mac!ine generall2 emlo2s moor. A. single0!ase series moor B. resisance sli0!ase C. s!aded0ole -. !2seresis comressor %ould be moor. A. caacior sar B. single0!ase series C. s!aded ole -. resisance sli0!ase
!an normal# !e more likel2 de&ec is A. imroer &uses B. s!ored running %inding C. oen sartng %inding -. %orn bearing '47. 8!e caacior in a caacior0sar inducton run ac moor is conneced in series %i! %inding. A. sartng B. suirrel0cage C. running -. comensatng C. -. sli !ase ac series '41. 8!e sartng %inding o& a single0!ase moor is C. -. does no !a)e A. cenri&ugal s%ic! B. sartng %inding C. suirrel0cage roor -. !ig! o%er &acor '49. 8!e sartng orue o& a caacior0sar '4(. 8!e leas exensi)e &ractonal !orseo%er laced in !e A. roor B. saor '4,. H& a single0!ase inducton moor runs slo%er '4. A ermanen0sli single0!ase caacior moor '/9. 8!e bes suied moor o dri)e a /K4 6: air moor is A. s!aded ole B. caacior0sar re)ersing connectons o& sartng %inding using a re)ersing s%ic! re)ersing sul2 connectons armaure Ield inducton0run moor is direcl2 relaed o !e angle or be%een is %o %inding currens b2 !e relaton A. cos C. an B. sin -. sin K' '"(. Hn a %o0)alue caacior moor# !e caacior used &or running uroses is aKan A. dr202e ac elecrol2tc caacior B. aer0saced oil Illed 2e C. air0caacior -. ceramic 2e '"1. H& !e cenri&ugal s%ic! o& a %o0)alue caacior '4'. One o& !e c!araceristcs o& a single0!ase moor is !a i A. is sel&0 sartng B. is no sel&0sartng C. reuires onl2 one %inding -. can roae in one directon onl2 moor using %o caaciors &ails o oen# !en A. elecrol2tc caacior %ill# in all robabili2# suer breakdo%n B. moor %ill no carr2 !e load C. moor %ill dra% excessi)el2 !ig! curren -. moor %ill no come u o !e raed seed '4/. A?er !e sartng %inding o& a single !ase '"'. Eac! o& !e &ollo%ing saemens regarding a '44. H& sartng %inding o& a single0!ase inducton '"/. Comensatng %inding is emlo2ed in an ac '4". 8!e directon o& roaton o& a single0!ase '"4. A uni)ersal moor is one %!ic! inducton moor is disconneced &rom sul2# i contnues o run onl2 on %inding. A. roor B. Ield C. comensatng -. running moor is le? in !e circui# i %ill A. dra% excessi)e curren and o)er!ea B. run slo%er C. run &aser -. sark a lig! loads moor can be re)ersed b2 A. re)ersing connectons o& bo! %indings s!aded0ole moor is rue exce A. is directon o& roaton is &rom un0s!aded o s!aded orton o& !e oles B. i !as )er2 oor e3cienc2 C. i !as )er2 oor .&. -. i !as !ig! sartng orue series moor in order o A. comensae &or decrease in Ield Tux B. increase !e oal orue C. reduce !e sarking a brus!es -. reduce eecs o& armaure reacton A. B. is a)ailable uni)ersall2 can be marked inernatonall2 C. -. can be oeraed ei!er on de or ac sul2 runs a dangerousl2 !ig! seed on no0load '"". Hn a single0!ase series moor !e main urose o& induct)el20%ound comensatng %indings is o reduce !e A. reacance em& o& commuaton B. roatonal em& o& commuaton C. rans&ormer em& o& commuaton -. none o& !e abo)e '",. A reulsion moor is euied %i! A. B. C . -. a commuaor sli0rings a reeller nei!er A nor B '"7. A reulsion0sar inducton0run single0!ase moor runs as an inducton moor onl2 %!en A. brus!es are s!i?ed o neural lane B. s!or0circuier is disconneced C. commuaor segmens are s!or0circuied -. saor %inding is re)ersed '". H& a dc series moor is oeraed on ac sul2# i %ill A. B. C. -. !a)e oor e3cienc2 !a)e oor o%er &acor sark excessi)el2 all o& !e abo)e '"9. An ousanding &eaure o& a uni)ersal moor is is A. B. C. -. bes er&ormance a "( 6 sul2 slo% seed a all loads excellen er&ormance on d.c. sul2 !ig!es ouu k*Kkg rato ',(. 8!e directon o& roaton o& a !2seresis moor is deermined b2 !e A. reent)i2 o& !e roor maerial B. amoun o& !2seresis loss C. ermeabili2 o& roor maerial -. ositon o& s!aded ole %i! resec o !e main ole ',1. 5eed o& !e uni)ersal moor is A. B. C. -. deenden on &reuenc2 o& sul2 roortonal o &reuenc2 o& sul2 indeenden o& &reuenc2 o& sul2 none o& !e abo)e ','. Hn !e s!aded ole suirrel cage0inducton moor# !e Tux in !e uns!aded ar al%a2s A. leads !e Tux in !e uns!aded ole segmen B. is in !ase %i! !e Tux in !e uns!aded ole segmen C. lags !e Tux in !e uns!aded ole segmen -. none o& !e abo)e ',/. *!ic! o& !e &ollo%ing moor is an inerestng examle o& beneIciall2 utliing a !enomenon !a is o?en considered undesirable+ A. !2seresis moor B. relucance moor C. -. seer moor s!aded0ole moor ',4. Fsuall2# large moors are more e3cien !an small ones. 8!e e3cienc2 o& !e tn2 moor is used in a %ris %ac! is aroximael2 er cen. A. 1 C. "( B. 1( -. ( ',". =or roducton o& a roatng magnetc Ield A. a single0!ase sul2 is o be conneced across a single0!ase %inding B. a %o0!ase sul2 s!ould be conneced across a %o0!ase
%inding C. a dc sul2 is o be conneced across a single0!ase %inding -. !e olarites o& a dc sul2 conneced across a single0!ase %inding s!ould be contnuousl2 re)ersed !roug! a suiable s%ic!ing0 de)ice ',,. *!en a single0!ase sul2 is conneced across a single0!ase %inding# !e naure o& magnetc Ield roduced is A. ulsatng in naure B. roatng in naure C. consan in magniude bu roatng a s2nc!ronous seed -. consan in magniude and directon ',7. Hn a resisance sli0!ase 2e single0!ase inducton moor# a tme0!ase dierence be%een !e currens in !e main and auxiliar2 %inding is ac!ie)ed b2 A. lacing !e %o0%indings a an angle o& 9( degrees elecrical in !e saor slos B. al2ing %o0!ase sul2 across !e %o %indings C. !a)ing dieren rato o& resisance o induct)e reacance &or !e %o %indings sulied &rom a single0!ase sul2 s2sem -. connectng !e %o %indings in series across a single !ase sul2 ',. Hn a sli0!ase caacior0sar inducton moor# a tme0!ase dierence be%een !e currens in !e main and auxiliar2 %inding is ac!ie)ed b2 A. lacing !e %o0%indings a an angle o& 9( degrees elecrical in !e saor slos B. al2ing %o0!ase sul2 across !e %o %indings C. inroducing caacit)e reacance in !e auxiliar2 %inding circui -. connectng !e %o %indings in series across a single !ase sul2 ',9. 8!e directon o& roaton o& an ordinar2 s!aded ole single0!ase inducton moor A. can be re)ersed b2 re)ersing !e sul2 erminal connectons o !e saor %inding B. canno be re)ersed C. can be re)ersed b2 oen0circuitng !e s!ading rings -. can be re)ersed b2 s!or0circuitng !e s!ading rings '7(. -irecton o& roaton o& sli0 !ase 2e single0 !ase inducton moor can be re)ersed b2 A. re)ersing !e sul2 erminals connectons B. re)ersing !e connecton o& onl2 !e auxiliar2 %inding across !e sul2 C. re)ersing !e connectons o& ei!er !e main %inding or !e auxiliar2 %inding erminals -. re)ersing !e connectons o& onl2 !e main %inding across !e sul2 erminals '71. Hn a single0!ase reulsion moor# orue is de)eloed on !e roor %!en !e brus! axis is Ixed A. a 9( degrees elecrical %i! !e saor Ield axis B. in alignmen %i! !e saor Ield axis C. a an acue angle %i! !e saor Ield axis -. a 9( degrees mec!anical %i! !e saor Ield axis '7'. H& !e cenri&ugal s%ic! o& a resisance sli0 !ase inducton moor &ails o close %!en !e moor is de0energied# !en A. no sartng orue %ill be de)eloed %!en sul2 is conneced again across !e moor erminals B. a dangerousl2 !ig! curren %ill To% !roug! !e main %inding %!en sul2 is conneced again across !e moor erminals C. sartng orue de)eloed ma2 no be su3cien o enable !e moor o resar -. !e moor %ill de)elo !ig! sartng orue %!en an a@em is made o resar '7/. A dc series moor %!en conneced across an ac sul2 %ill A. de)elo orue in !e same directon B. no de)elo an2 orue C. dra% dangerousl2 !ig! curren -. de)elo a ulsatng orue '74. 8o enable a dc series moor %ork sats&acoril2 %i! an ac sul2# !e &ollo%ing modiIcatons s!ould be done A. 8!e 2oke and !e oles s!ould be comleel2 laminaed B. Onl2 !e oles s!ould be made o& laminaed seel C. 8!e air0ga be%een !e saor and !e roor be reduced -. Comensatng oles s!ould be inroduced 5C6ROOF5 MO8OR5 '7". EE Board Exam Aril 19 9/ A single !ase s2nc!ronous moor gi)es an ouu o& 9.4, k* a (.9 lagging .&. a ,(()ols. H& !e sra2 o%er loss is ,(( %a@s and !e Ield loss is 9(( %a@s# %!ile !e eect)e armaure resisance is (.,0o!m# calculae !e e3cienc2 o& !e s2nc!ronous moor. A. './"$ C. ".'"$ B. 1.'4$ -. 4.,4$ '7,. EE Board Exam Aril 1991 A !ree0!ase s2nc!ronous moor is measured b2 %o %a@meers A and B. *a@meer A reads '., k* and %a@meer B reads 4,." k*. 8!e inu o%er o& !e moor is under excied and assumed consan. *!a are !e readings o& %a@meers A and B i& !e o%er &acor is "$ and !e moor is o)er0excied+ A. 4., k*# ',." k* B. 4'." k*# /'., k* C. "'., k*# ''." k* -. "1 k*# '4.1 k* '77. EE Board Exam Ocober 1991 A /#,(( )ols !ree0!ase sar conneced urbo s2nc!ronous generaor o& s2nc!ronous reacance o& (." o!m er !ase and negligible resisance is sul2ing /(#((( kA a (. & lagging o a large o%er s2sem. H& !e seam sul2 is cu0o# calculae !e amoun o& curren !a !e generaor %ill !en carr2 assuming negligible losses. A. /9(1 A C. /(94 A B. /'/ A -. /7( A '7. REE Board Exam Ocober 1994 A %2e0conneced urbo alernaor !a)ing a s2nc!ronous reacance o& (." o!m and negligible resisance is conneced o a large o%er s2sem !a)ing a busbar )olage o& 1/. k sul2ing a load o& 1"#((( kA a (.( lagging o%er &acor. H& !e seam sul2 is
cuo# !e armaure curren %ill !e mac!ine carr2 assuming negligible losses+ A. '",."" A C. /4.', A B. "'".,' A -. ,'7."" A '79. REE Board Exam Ocober 1994 A 1#((( kA# ,#,(( %2e0conneced !ree!ase alernaor !a)ing a reacance o& . o!ms and a negligible resisance is sul2ing o%er o a consan &reuenc2 bus bar. 8!e oen0circui em& a !is insance is 4#/11 er !ase. H& seam sul2 is suddenl2 cu0o# !e armaure curren in ameres is neares o A. "7 C. "9 B. ,( -. ", '(. EE Board Exam Ocober 19" An induct)e load consumes 1( k* a (.7" & lagging. A s2nc!ronous moor %i! a & o& (.9 leading is conneced in arallel %i! !e induct)e load. *!a is !e minimum reuired k* sie o& !e s2nc!ronous moor so !a !e combined load %ill !a)e a & o& (. lagging+ A. 1.(, k* C. 1.(7" k* B. 1.'(/ k* -. 1.1(9 k* '1. EE Board Exam Aril 19(# Aril 199' An indusrial lan dra%s "(( k* a (., o%er &acor &rom a /0!ase s2sem. Hn order o raise !e o%er &acor o (.,, lagg ing and o sul2 needed additonal o%er# a s2nc!ronous moor is added. 8!is moor dra%s /(( k*# bringing !e ne% oal lan load o (( k*. eglectng !e losses o& !e s2nc!ronous moor# calculae is exac reuired kA ratng. A. /,/.'4 kA B. /4".'/ kA C. /9/./4 kA -. /(7./" kA ''. EE Board Exam Aril 19 An existng indusrial lan !as an a)erage load o& 9(( k* a (., g lagging. 8o raise !e o)erall o%er &acor o (.9'# a s2nc!ronous moor dri)ing a -C generaor is o be insalled. H& !e inu o& !e s2nc!ronous moor %ill be '"( k*# calculae is kA inu ratng. A. 7"/ kA C. 7'/ kA B. 7 kA -. 71" kA '/. EE Board Exam Ocober 1994 :o%er &acor imro)emen ma2 be ac!ie)ed b2 !e use o& A. s2nc!ronous moor B. s2nc!ronous con)erer C. long ransmission line -. inducton moor '4. EE Board Exam Ocober 199/ A s2nc!ronous moor A. %ill !a)e a lo% o%er &acor %!en run belo% raed seed B. ma2 !a)e is seed )aried b2 insertng a r!eosa in !e -C Ield curren C. %ill slo% do%n %i! an increase in load %i!in !e limis o& is ull ou orue -. %ill ake minimum line curren a an2 load %!en oeratng a uni2 o%er &acor '". EE Board Exam Oc ober 199( Hn sartng a "(( 6:# '#/(( )ols# /0!ase s2nc!ronous moor !e Ield %inding is initall2 s!or circuied so as o A. ro)ide be@er Tux disributon in !e air ga B. increase induced )olage in Ild %inding C. roduce muc! larger sartng orue -. lo%er )olage roduced be%een la2ers o& !e Ield ',. EE Board Exam Aril 199( A s2nc!ronous moor running %i!ou load is A. s2nc!ronous con)erer B. s2nc!ronous condenser C. caacior moor -. inducton moor '7. Hn a s2nc!ronous moor# damer %inding is ro)ided in order o A. sabilied roor moton B. suressed roor oscillatons C. de)elo necessar2 sartng orue -. bo! B and C '. Hn a s2nc!ronous moor# !e magniude o& saor back e.m.&. Eb deends on A. seed o& !e moor B. load on !e moor C. bo! !e seed and roor Tux -. d.c. exciaton onl2 '9. An elecric moor in %!ic! bo! !e roor and saor Ields roae %i! !e same seed is called aKan moor. A. d.c. B. 5c!rage C. s2nc!ronous -. uni)ersal '9(. *!ile running# a s2nc!ronous moor is comelled o run a s2nc!ronous seed because o& A. daming %inding in is ole &aces B. magnetc locking be%een saor and roor oles C. included e.m.&. in roor Ield %inding b2 saor Tux -. comulsion due o \enLs la% '91. 8!e directon o& roaton o& a s2nc!ronous moor can be reser)ed b2 re)ersing A. curren o !e Ield %inding B. sul2 !ase seuence C. olari2 o& roor oles -. none o& !e abo)e '9'. *!en running under no0 load conditon and %i! normal exciaton# armaure curren Ha dra%n b2 a s2nc!ronous moor A. leads !e back e.m.&. Eb b2 a small angle B. is large C. lags !e alied )olage b2 a small angle -. lags !e resulan )olage ER b2 9(_ '9/. 8!e angle be%een !e s2nc!ronousl2 roatng saor Tux and roor oles o& a s2nc!ronous moor is called angle. A. s2nc!roniing B. orue C. o%er &acor -. sli '94. H& load angle o& a 4 ole s2nc!ronous moor is _ elec.P# is )alue in mec!anical degree is . A. 4 C. (." B. ' -. (.'" '9". 8!e maximum )alue o& orue angle in a s2nc!ronous moor is degrees elecrical. A. 4" B. 9( C. be%een 4" and 9( -. belo% ,( '9,. A s2nc!ronous moor running %i! normal exciaton ad;uss o load essentall2 b2 increases in is A. o%er &acor B. orue angle C. back e.m.&. -. armaure curren '97. *!en load on a s2nc!ronous moor running %i! normal exciaton is increased# armaure curren dra%n b2 i increases because A. B. C. -. back e.m.&. Eb becomes less !an alied )olage o%er &acor is decreased ne resulan )olage ER in armaure is increased moor seed is reduced '9. *!en load on a normall20excied s2nc!ronous moor is increased# is o%er &acor ends o
A. aroac! uni2 B. become increasingl2 lagging C. become increasingl2 leading -. remain unc!anged '99. 8!e eec o& increasing load on a s2nc!ronous moor running %i! normal exciaton is o A. increase bo! is Ha and .&. B. decrease Ha bu increase .&. C. increase Ha bu decrease .&. -. decrease bo! Ha and .&. /((. Hgnoring !e eecs o& armaure reacton i& exciaton o& a s2nc!ronous moor running %i! consan load is increased# is orue angle mus necessaril2 A. decrease B. increase C. remain consan -. become %ice !e no0load )alue /(1. H& !e Ield o& a s2nc!ronous moor is underexcied# !e o%er &acor %ill be A. lagging B. leading C. uni2 -. more !an uni2 /('. Hgnoring !e eecs o& armaure reacton# i& exciaton o& a s2nc!ronous moor running %i! consan load is decreased &rom is normal )alue i leads o A. increase in bu decrease in Eb B. increase in Eb bu decrease in Ha C. increase in bo! Ha and .&. %!ic! is lagging -. increase in bo! Ha and /(/. A s2nc!ronous moor conneced o inInie busbars a consan &ull0load# 1(($ exciaton and uni2 .&. On c!anging !e exciaton onl2# !e armaure curren %ill !a)e A. leading .&. %i! under0exciaton B. leading .&. %i! o)er0exciaton C. lagging .&. %i! o)er0exciaton -. no c!ange o& .&. /(4. 8!e 0cur)es o& a s2nc!ronous moor s!o% relatons!i be%een A. exciaton curren and back em& B. Ield curren and .&. C. dc Ield curren and ac armaure curren -. armaure curren and sul2 )olage /(". *!en a load on a s2nc!ronous moor is increased# is armaure currens is increased ro)ided i is A. normall2 excied B. C. -. o)er0excied under0excied all o& !e abo)e /(,. H& main Ield curren o& a salien0ole s2nc!ronous moor &ed &rom an inInie bus and running a no0load is reduced o ero# i %ould A. come o a so B. contnue running a s2nc!ronous seed C. run a sub0s2nc!ronous seed -. run a suer0 s2nc!ronous seed /(7. Hn a s2nc!ronous mac!ine %!en !e roor seed becomes more !an !e s2nc!ronous seed during !untng# !e daming bars de)elo A. s2nc!ronous moor orue B. d.c. moor orue C. inducton moor orue -. inducton generaor orue /(. Hn a s2nc!ronous moor# !e roor Cu losses are me b2 A. moor inu B. armaure inu C. sul2 lines -. d.c. source /(9. A s2nc!ronous mac!ine is called a doubl20 excied mac!ine because A. i can be o)erexcied B. i !as %o ses o& roor oles C. bo! is roor and saor are excied -. i needs %ice !e normal excitng curren /1(. 52nc!ronous caacior is A. B. C. -. an ordinar2 satc caacior bank an o)er0excied s2nc!ronous moor dri)ing mec!anical load an o)er0excied s2nc!ronous moor running %!en mec!anical load none o& !e abo)e Fnsol)ed roblems /11. REE Board Exam 5e ember '((4 *!a is !e ercen sli o& !e s2nc!ronous moor %!en running+ A. / C. 1 B. '." -. ( /1'. 8!e seed regulaton o& as s2nc!ronous moor is A. B. C. -. uni2 ero inIni2 al%a2s less !an one /1/. 52nc!ronous moors are o be used in siuaton %!ere A. !e load is consan B. !e load is reuired o be dri)en a )er2 !ig! seeds C. !e load is o be dri)en a consan seed -. !e sartng orue reuiremen o& !e load is )er2 !ig! 5C6ROOF5 COER8ER5 /14. EE Board Exam Aril 1994 Hn a !ree !ase s2nc!ronous con)erer# !e rato o& !e AC )olage o -C )olage is A. (.,1' C. (."( B. 1.( -. (.7(7 /1". EE Board Exam Aril 199' A "(( k*# ,((0 -C# 1'0!ase s2nc!ronous con)erer oeraes as a direc con)erer a a &ull load e3cienc2 o& 9'$ and a o%er &acor o& (.9/. Calculae !e AC )olage be%een sli rings and !e AC curren dra%n &rom a 1'!ase rans&ormer &ed sul2. A. 11' # ''9 A B. 11' # '1" A C. 11( # ''9 A -. 11( # '1" A /1,. EE Board Exam Aril 199' A generaor is raed ,(( kA# '4( # ,( c2cles# /0!ase# , oles and %2e0conneced. *!a %ill be !e seed o& !e dri)ing ulle2 i& !e dri)en and dri)ing ulle2s are 1 ? and ' ? in diameer resect)el2+ A. '4(( rm C. ,(( rm B. 1'(( rm -. 9(( rm /17. REE Board Exam Ocober 199 8!e ulle2 o& an old gen0se !as a diameer o& '( inc!es. 8!e bel exers a ull o& /"/ ounds on !e ulle2. 8!e gen0se runs a 9(( rm. *!a is !e aroximae k* ratng o& !e gense+ A. 7" C. '(( B. '"( -. /7." /1. 8!e seed o& a moor0generaor se consistng o& a ,0ole inducton moor and a 40ole dc generaor &ed &rom a /0!ase. A. 1((( C. 1"(( B. ,(( -. /((( /19. A roar2 con)erer generall2 A. B. C. -. combines !e &unctons o& an inducton moor and a d.c. generaor !as a se o& sli D rings a bo! ends !as one armaure and %o Ields is a s2nc!ronous moor and a d.c. generaor combined /'(. 8!e a.c. line curren a sli0rings in a ,0!ase# ,0ring# roar2 con)erer !a)ing 1(($ e3cienc2 and uni2 .&. is tmes !e d.c. curren. A. (.94/ C. (.'/, B. (.47' -. 1.414 /'1. A /0
!ase sul2 can be con)ered ino a ,0 !ase sul2 b2 ;oining !e secondaries o& !e /0!ase rans&ormer in A. double dela B. double sar C. diamerical -. an2 o& !e abo)e /''. One uniue ad)anage o& emlo2ing inducton regulaor me!od &or conrolling !e dc ouu )olage o& a roar2 con)erer is !a i A. is exremel2 simle and relat)el2 c!eaer B. resonds insananeousl2 o c!anges in load C. can be used &or in)erers -. gi)es )olage c!anges in exac ;ums /'/. 8!e mos commonl2 used connecton &or ;oining !e six secondaries o& a rans&ormer used &or /0!ase o ,0!ase con)ersion is A. diamerical B. ig0ag C. double sar -. double0dela /'4. 8!e &uncton o& a c2clocon)erer is o con)er A. B. C. -. ac o%er ino dc o%er direc curren ino alernatng curren !ig! ac &reuenc2 direcl2 o lo% ac &reuenc2 a sine %a)e ino a recangular %a)e /'". Ma;or disad)anage o& using !ree ses o& 5CRs &or )ariable )olage seed conrol o& a 5CHM is !e ' A. considerable H R loss B. oor o%er &acor C. long dela2 o& !2risor Iring ulses -. necessi2 o& using a rocessor /',. Hn !e curren &ed &reuenc2 con)erer arrangemen &or conrolling !e seed o& an indi)idual 5CHM# !e directon o& roaton can be re)ersed b2 A. c!anging !e ouu &reuenc2 o& !e in)erer B. alering !e !ase seuence o& ulses !a rigger !e d.c link curren C. inerc!anging an2 %o line leads -. re)ersing !e d.c link curren /'7. Hn !e c!oer uses seed conrol me!od &or a *RHM !e moor seed in)ersel2 deends on A. Ixed resisor across !e rectIer B. c!oer s%ic!ing &reuenc2 C. c!oer O tme 8O -. bo! B and C /'. Hn !e s2nc!ronous moor dri)e using curren &ed dc link A. con)erer0' &unctons as a sel& commuaed in)erer B. con)erer01 %orks as unconrolled rectIer C. con)erer0/ is a conrolled rectIer -. gae riggering o& con)erer ' is done a moor &reuenc2 /'9. Hn !e !ree c2clocon)erer dri)e o& a s2nc!ronous moor A. eac! c 2clocon)erer roduces a /0!ase ouu B. all c2clocon)erers ac as )olage sources C. a /0!ase conrolled rectIer roduces Ield0excitng curren -. air0ga Tux is ke consan b2 conrolling saor currens onl2 5:ECHA\ MAC6HE5 //(. A single D sack# 4 D !ase# , D ole R seer moor %ill !a)e a se angle o& A. 1"` C. 4"^ B. /(` -. 9(` // 1. Hn a !ree0sack 1'K ole R moor# !e roor ole ic! is A. 1"` B. /(` C. -. 4"^ ,(` //'. A !ree0sack R seer moor !as a se angle o& 1(`. *!a is !e number o& roor ee! in eac! sack+ A. /,` C. 1^ B. '4` -. 1'^ ///. H& a !2brid seer moor !as a roor ic! o& /,` and a se angle o& 9`# !e number o& is !ases mus be A. 4 C. / B. ' -. , //4. *!a is !e se angle o& a ermanen0magne seer moor !a)ing saor oles and 4 roor oles+ A. ,(` C. /(^ B. 4"` -. 1"` //". A seing moor is a de)ice. A. B. C. -. //,. Oeraton o& seing moors a !ig! seed is C. -. inc!ing ;og ging //7. *!ic! o& !e &ollo%ing !ase s%ic!ing seuence reresens !al&0se oeraton o& a R seer moor+ A. A# B# C# A B. A # C# B# A . C. AB# BC# CA# AB -. A# AB# B# BC . //. 8!e roatonal seed o& a gi)en seer moor is deermined solel2 b2 !e A. s!a? load B. se ulse &reuenc2 C. olari2 o& saor curren -. magniude o& saor curren //9. A seer moor ma2 be considered as a con)erer. A. dc o ac B. ac o ac C. dc o ac -. digial0o0analogue A. B. C. -. %indings commuaor brus!es all o& !e abo)e /41. *a)e exciaton o& a seer moor resuls in A. B. C. -. microseing !al& D seing increased se angle reduced resoluton /4'. A seer moor !a)ing a resoluton o& /(( sesKre) and running a '4(( rm !as a ulse rae o& s. A. 4((( C. ,((( B. ((( -. 1(#((( /4/. 8!e orue exered b2 !e roor magnetc Ield o& a :M seing moor %i! unexcied saor is called orue. A. relucance B. deen C. !olding -. ei!er B or C /44. A )ariable relucance seer moor is consruced o& maerial %i! salien oles. A. aramagnetc B. &erromagnetc C. diamagnetc -. nonDmagnetc /4". 8!oug! srucurall2 similar o a conrol mec!anical elecrical analogue incremenal re&erred o as A. &as &or%ard B. sle%ing /4(. 8!e roor o& a seer moor !as no ransmi@er# a conrol recei)er diers &rom i in !e &ollo%ing %a2 A. i !as /0!ase saor %inding B. i !as a roor o& dumbbell consructon C. i !as a mec!anical damer on is s!a? -. i !as a single0!ase roor exciaton /4,. 8!e conrol s2nc!ro !as !ree0!ase %inding bo! on is saor and roor A. dierental C. recei)er B. rans&ormer -. ransmi@er /47. Regarding )olages induced in !e !ree saor %indings o& a s2nc!ro# %!ic! saemen is &alse+ A. !e2 deend on roor ositon B. !e2 are in !ase C. !e2 dier in magniude -. !e2 are ol2!ase )olages /4. 8!e lo%0orue s2nc!ros canno be used &or A. B. C. -. orue ransmission
error deecton insrumen ser)os robo arm ositoning /49. *!ic! o& !e &ollo%ing s2nc!ros are used &or error deecton in a ser)o conrol s2sem+ A. conrol ransmi@er B. conrol rans&ormer C. conrol recei)er -. bo! A and B /"(. =or orue ransmission o)er a long disance %i! !e !el o& elecrical %ires# %!ic! o& !e &ollo%ing %o s%ic!es are used+ A. C[ and C8 B. C[ and CR C. C[ and C- -. C8 and C- /"1. 8!e arrangemen reuired &or roducing a roaton eual o !e sum or dierence o& !e roaton o& %o s!a?s consis o& !e &ollo%ing couled s2nc!ros. A. conrol ransmi@er B. conrol recei)er C. conrol dierental ransmi@er -. all o& !e abo)e /"'. *!ic! o& !e &ollo%ing moor %ould sui alicatons %!ere consan seed is absoluel2 essental o ensure a consisen roduc+ A. brus!es dc moor B. disk moor C. ermanen0magne s2nc!ronous moor -. seer moor /"/. A s%ic!ed relucance moor diers &rom a R seer moor in !e sense !a i A. !as roor oles o& &erromagnetc maerial B. roaes contnuousl2 C. is designed &or oen D loo oeraton onl2 -. !as lo%er e3cienc2 /"4. 8!e elecrical dislacemen be%een !e %o saor %indings o& a resol)er is A. 1'(` C. B. 9(` -. ,(^ 4"` /"". *!ic! o& !e &ollo%ing moor runs &rom a lo% dc sul2 and !as ermanenl2 magneted salien oles on is roor+ A. ermanen magne dc moor B. disk dc moor C. ermanen magne s2nc!ronous moor -. brus!less dc moor /",. A dc ser)omoor is similar o a regular dc moor exce !a is design is modiIed o coe %i! A. elecronic s%ic!ing B. slo% seeds C. satc conditons -. bo! B and C /"7. One o& !e basic reuiremens o& a ser)omoor is !a i mus roduce !ig! orue a all A. loads C. seeds B. &reuencies -. )olages /". 8!e mos common %o0!ase ac ser)omoor diers &rom !e sandard ac inducton moor because i !as A. !ig!er roor resisance B. !ig!er o%er ratng C. moor saor %indings -. greaer inerta /"9. 5uirrel0cage inducton moor is Inding increasing alicaton in !ig!0o%er ser)o s2sems because ne% me!ods !a)e been &ound o A. increased is roor resisance B. conrol is orue C. decrease is inerta -. decoule is orue and Tux /,(. A six0ole# !ree0!ase suirrel0cage inducton moor is conneced o a ,(0cs sul2. A &ullload# !e roorLs induced em& makes 7' comlee c2cles in 1 minue. =ind !e roor seed. A. 117, rm C. 1("4 rm B. 1 '(( rm -. 11'4 rm /,1. A "( 6:# 44( # /0!ase# ,( 6# ,0ole suirrel cage inducton moor is oeratng a &ull0load and (. &. 8!e &ull0load e3cienc2 is "$ and !e ercenage sli is "$. -eermine !e &ullload orue. A. '14."" 0m B. '(,.7' 0m C. /1'.47 0m -. /'/.'4 0m /,'. A s2nc!ronous moor is dra%ing ,( k* is conneced in arallel %i! a load dra%ing '"( k* a a lagging o%er &acor o& (.. H& !e combined load !as a o%er &acor o& (.9# a %!a o%er &acor is !e s2nc!ronous moor oeratng+ A. (.,' leading B. (.49 leading C. (., leading -. (.74 leading /,/. A !ree0!ase 0conneced s2nc!ronous moor %i! a line0o0line )olage o& 44( and a s2nc!ronous seed o& 9(( rm oeraes %i! a o%er o& 9 k* and a lagging o%er &acor o& (.. 8!e s2nc!ronous reacance er !ase is 1( o!ms. -eermine !e orue angle in elecrical degrees. A. /,.//^ C. /"."1^ B. //."1^ -. /.4,^ /,4. A 1(0!# '/(0# !ree0!ase 0 conneced s2nc!ronous moor !as a reacance o& / o!ms er !ase and a negligible resisance. 8o %!a )olage mus !e moor is excied in order o deli)er &ull load a uni2 o%er &acor and 9($ e3cienc2+ A. ',' C. '4 B. '"4 -. '4' /,". A !ree0!ase# sar conneced s2nc!ronous moor akes "( k* a ,,( # !e o%er &acor being (. lagging. 8!is mac!ine !as a s2nc!ronous reacance o& 1 o!m er !ase %i! a negligible resisance. H& !e em& is increased b2 /($# !e o%er aken remaining !e same# Ind !e ne% leading curren. A. 94.1 A C. 9(./ A B. ".' A -. ., A /,,. A ,., k# 0conneced s2nc!ronous moor !as a s2nc!ronous reacance er !ase o& 1( o!ms and a negligible resisance. =or a cerain load# !e moor dra%s 99( k* a normal )olage. A !is load# !e induced em& er !ase is "1,( . -eermine oeratng &. A. (.47 C. (.4,' B. ( ."(' -. (."1 /,7. A 7"0!# ,((0)ol# 1(((0rm# !ree0 !ase 0 conneced s2nc!ronous moor !as an armaure resisance o& (.(" o!m er !ase and a leakage reacance o& (.4" o!m er !ase. 8!e e3cienc2 a raed load# ($ & leading is 9'$. -eermine mec!anical o%er de)eloed %i!in !e armaure. A. ,4 k* C. ,( k* B. ,' k* -. ,7 k* /,. A '/( # ,( 6# /0!ase# 0conneced s2nc!ronous moor dra%s a curren o& '( A and deli)ers b!. Armaure resisance er !ase is (." . H& !e iron and &ricton losses amoun o /(( *# deermine !e oeratng o%er &acor o& !e moor. A. (.(9 C. (.,, B. (.(7 -. (.,' /,9. A ''(( # '(( !# /0!ase mes!
conneced s2nc!ronous moor is %orking on &ull load a an e3cienc2 o& (. and (. & leading. 8!e armaure reacance er !ase is " o!ms. -eermine !e induced em& er !ase. eglec resisance. A. '/77 C. '/( B. '/4" -. '/(7 /7(. A "((0!# ''(( # /0!ase# sar0conneced s2nc!ronous moor !as a s2nc!ronous imedance o& (./ G ;/ er !ase. -eermine !e induced em& er !ase i& !e moor %orks on &ull load %i! an e3cienc2 o& 94$ and a o%er &acor o& (. leading. A. 1/,( C. 14(' B. 1/"4 -. 1"'' /71. An alernaor raed "/(0kA# is oeratng a (.,( & lagging. A s2nc!ronous condenser is in arallel o imro)e !e & o 9 ($ lagging. -eermine !e oeratng o%er &acor o& !e s2nc!ronous condenser. Assume !e alernaor is no suosed o be o)erloaded. A. (."4, leading B. (.447 leading C. (.,4/ leading -. (."9/ leading /7'. A '/(0# ,(06# single0!ase s2nc!ronous moor is aking a curren o& '( A a (.,, lagging .&. Eect)e armaure resisance is (./ o!m. Hron and &ricton losses amoun o 4"( *. -eermine !e e3cienc2 o& !e moor a !is load. eglec losses in !e exciaton. A. ,.1"$ C. ."'$ B. "./($ -. /.'($ /7/. A 1"0!# '/( # single !ase s2nc!ronous moor is aking a curren o& "( A a a o%er &acor o& (." leading. Eect)e resisance is (.' o!m. H& !is moor dri)es a mec!anical load o& 1' !# deermine is roatonal losses. A. /'/ * C. /7, * B. /4( * -. /14 * /74. A single0!ase roar2 con)erer !as an ouu )olage o& 11( )ols. -eermine !e line curren in !e AC side %!en !e mac!ine deli)ers a -C ouu o& "( A. Assume !e mac!ine is oeratng %i! a & o& (." and e3cienc2 o& 9"$. A. 7(.71 A C. 7."7 A B. 9(./4 A -. '.'/ A /7". 8!ree single0 !ase rans&ormers conneced dela0dela &ed a !ree0!ase roar2 con)erer a '#/(( . 8!is con)erer sulies o%er o a -C load !a dra%s 1(( k* a '"( . H& !e roar2 con)erer oeraes a an e3cienc2 o& 9"$ a uni2 &# calculae !e curren in !e secondar2 %indings o& !e rans&ormer bank. A. /97 A C. ''9 A B. /"" A -. '49 A /7,. A 40!ase sar conneced roar2 con)erer oeratng a (.9( e3cienc2 and (." o%er &acor is conneced across a ''( # ,( 6 mains and dra%s "( A. -eermine !e -C load curren. A. '(.4, A C. '1,./7 A B. ''(."4 A -. '1'.'" A /77. 8!e dc ouu o& a six0!ase sar0 conneced con)erer is "(( k* a 4(( . H& !e & and e3cienc2 o& !e mac!ine is (.,, and (.9' resect)el2# deermine !e ac curren dra%n &rom !e sul2. A. 7,' A C. 7/' A B. 74( A -. 7'9 A /7. A ,(( k*# ,0!ase# 0conneced# 10ole# s2nc!ronous con)erer !as simlex la %ound armaure %i! 1((( conducors. 8!e Tux er ole is ,( m*b. 8!e mac!ine runs a ,(( rm a raed load. -eermine !e ac curren in !e sli rings. Assume !e oeratng o%er &acor and e3cienc2 o& !e mac!ine eual o 1.( and (.9 resect)el2. A. 49,.'1 A C. 4,'.'" A B. 4.4' A -. 47'.(7 A /79. A 40ole '/(0# ,( 6# !ree0!ase inducton moor direcl2 dri)es a ,0ole alernaor. -eermine !e ouu &reuenc2. Assume a sli o& /$ in !e moor. A. 9(.( 6 C. ,., 6 B. .4 6 -. 7./ 6 /(. A !ree0!ase roar2 con)erer deli)ers 1"( A a "(( dc. -eermine !e curren on !e AC side i& !e oeratng o%er &acor o& !e mac!ine is (. and !e e3cienc2 is 9($ A. 179 A C. 19 A B. 1"7 A -. 19, A /1. An oen dela bank is ser)ing a !ree0!ase roar2 con)erer. 8!e con)erer sulies 17" A o& curren o 1.4 o!m dc resist)e load. H& !e mac!ine dra%s an AC c urren o& 1(( A a (. & lagging# deermine minimum sie o& rans&ormer needed. A. 1".( kA C. '".9 kA B. '4.7 kA -. 19.4 kA /'. 8!e ercen sli o& an inducton moor is !e rato A. roor coer loss K roor o%er inu B. saor coer loss K saor o%er inu C. saor coer loss K roor o%er ouu -. roor coer loss K saor coer loss //. An ( k*# 44( )ols# /0!ase conneced# ,( 6# 40ole s2nc!ronous moor !as a s2nc!ronous reacance o& /0o!m er !ase. Calculae !e orue in e%on0meer i& i is oeratng a raed conditon a 9'$ e3cienc2. A. 714 C. "71 B. 1/" -. 4,1 /4. A ''( )ols single !ase inducton moor dra%s curren o& 1( ams a (.7" &. A caacior o& "( = is conneced in order o imro)e !e o%er &acor. *!a is !e ne% o%er &acor+ A. (. ,, leading B. (.,, lagging C. (.9" lagging -. (.9" leading and a reacance o& '" o!ms er !ase. -eermine !e induced em& %!en &ull2 loaded a (. o%er &acor lagging. A. ""'1 C. "47" B. "/,' -. ""' /9. H& s is !e s2nc!ronous seed and s !e sli# !en acual running seed o& an inducton moor %ill be A. s C. 1 D sPs B. ss -. s D 1Ps /9(. *!en !e s2nc!ronous moor !as a leading o%er &acor# !e generaed em& is !an !e alied )olage. A. eual B. greaer C . lesser -. none o& !ese /91. 8!e %ord 8E=C sands &or A. B. C. -. oall2 enclosed &reuenc2 conrolled orue# energ2#
&reuenc2 conrolled oall2 enclosed &used cooled oall2 enclosed &an cooled /9'. 52nc!ronous moor are A. B. C. -. sel&0sartng no sel&0sartng essentall2 sel&0sartng none o& !ese /9/. 8!e moor in %!ic! saor and roor magnetc Ield roae a !e same seed is A. inducton moor B. uni)ersal moor C. reducton moor -. s2nc!ronous moor /". A es is er&ormed on a '/( )ols# dela conneced s2nc!ronous moor !a)ing 9'$ e3cienc2 and "$ o%er &acor. *i! , )ols dc imressed across is erminals# !e curren reading is 9( ameres. -eermine !e o!mic resisance er !ase. A. (.(,7 K!ase B. (.44 K!ase C. (.1 K!ase -. (.1" K!ase /,. A s2nc!ronous moor oeraes contnuousl2 on !e &ollo%ing du2 c2cle< "( ! &or 1( sec# 1(( ! &or 1( sec# 1"( ! &or " sec# 1'( ! &or '( sec# idling &or 14 sec. *!a %ould be !e sie o& moor o be used+ A. 9( ! C. 1"( ! B. 1(( ! -. 1'( ! /7. A ol2!ase moor ma2 be roeced agains re)ersal o& roaton b2 using a A. re)erse seed rela2 B. re)erse o%er rela2 C. re)erse !ase rela2 -. re)erse curren rela2 /. A 1((( kA# 11 k# /0!ase# 0 conneced s2nc!ronous moor !as a resisance o& / o!ms /94. An o)er0excied s2nc!ronous moor akes A. B. C. -. lagging curren leading curren lagging and leading curren none o& !ese /9". Hn a s2nc!ronous moor# %!ic! loss does no )ar2 %i! load+ A. coer losses B. !2seresis losses C. %indage losses -. none o& !e abo)e /9,. 5uirrel cage inducton moor diers &rom !e sli ring 2e in !a i !as no A. sli rings B. %indings on !e saor C. roor %inding -. roatng ar /97. A /0 s2nc!ronous moor runs a &ull0load seed o& 1'(( rm. H& !e load is reduced o one0!al& o& raed# calculae is seed regulaton. A. 1(($ C. ($ B. "($ -. ,.,$ /9. An indusrial load is aking "(( k* a (., lagging .&. is desired o raise !e .&. o (.,, lagging using a s2nc!ronous mac!ine %!ose o%er inu is /(( k*. Calculae !e kA ratng o& !e moor reuired &or suc! oeraton and !e o%er &acor a %!uc! !e moor %ill oerae. A. /," kA# (.', leading B. /," kA# (.77 leading C. / (" kA# (.', leading -. /( kA# (.,, leading /99. A /D!ase# 44(0)ols# "( 6 inducton moor !as 4$ sli. *!a is !e &reuenc2 o& !e roor induced em&+ A. '(( 6 C. ' 6 B. "( 6 -. (.' 6 4((. *!a is !e rato o& maximum o &ull0 load orue in a moor !a)ing a sli o& "$ a &ull0load and '"$ a maximum orue+ A. 1" C. / B. '., -. ".' 4(1. A / ,0ole inducton moor !as a namelae seed o& 11,( rm# %!a is is &ull0load sli+ A. '."$ C. /."9$ B. /./$ -. 1.4$ 4('. A /# inducton moor is %ound &or 4 oles and is sulied &rom a "( 6 s2sem. *!a is !e roor &reuenc2 %!en roor runs a 141( rm+ A. / 6 C. '.9 6 B. '." 6 -. /." 6 4(/. A. B. C. -. 4(4. A. B. C. -. 4(". A. B. C. -. Queston Bank in AC EERA8OR5 4(,. EE Board Exam Ocober 199( *!a is !e seed o& a 1(( k*# '/(0)ol# !ree!ase# &our0ole# ,( 6 alernaor+ A. 4"( rm C. 1'(( rm B. 9(( rm -. 1(( rm 4(7. REE Board Exam Aril 1997 A six0ole# /0!ase AC generaor !as 7' slos# !e coil san is 1'. *!a is !e ic! &acor+ A. 1.((( C. (.9" B. (.9/9 -. (.9,, 4(. REE Board Exam Ocober 1994 A /( MA# 1" k !ree0!ase alernaor %ill !a)e a er !ase nominal imedance o& . A. B. C. -. 7." o!ms 9 o!ms 1" o!ms none o& !ese 4(9. EE Board Exam Aril 199( A ,0ole# /0!ase# ,( c2cle alernaor !as 1' slos er ole and &our conducors er slo. 8!e %inding is "K, ic!. 8!ere are '#"((#((( Max%ells enering !e armaure &rom eac! or! :ole# and !is Tux is sinusoidall2 disribued along !e air ga. 8!e armaure coils are all0conneced in series. 8!e %inding is %2econneced. -eermine !e oen circui em& o& !e alernaor. A. "/'.1 C. "1'.4 B. "(4.' -. "7'.4 41(. EE Board Exam Aril 199" A 1'(( kA# ,,(( )ol# /0!ase# 0conneced alernaor !as an eect)e resisance o& (.4( o!m and a reacance o& , o!ms er !ase. H deli)ers &ull load curren o& (.( lagging o%er &acor a raed )olage. *!a %ill be !e erminal )olage &or !e same exciaton and load curren i& !e o%er &acor is (.( leading+ A. 4",( C. 79 B. 97 -. 4'"( 411. REE Board Exam Marc! 199 A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance is 1." tmes !e o!mic resisance. 8!e o!mic resisance is obained b2 connectng %o erminals o a -C source. 8!e curren and )olage are 7., A and , resect)el2. *!a is !e eect)e resisance er !ase+8!e generaor is %2e0conneced. A. (.("1/ o!m C. (./4' o!m B. (.(," o!m -. (.(,17 o!m 41'. REE Board Exam Ocober 1997 8o ge !e armaure resisance o& a 1(( M*# 1/.9 k and 9($ o%er &acor generaor# %o erminals are conneced o a -C source. 8!e measured curren and )olage are 7., ameres and , )ols resect)el2. *!a is !e -C resisance er !ase+ A.
(.(''/ o!m C. (.(," o!m B. (.(/4' o!m -. (.(,17 o!m 41/. EE Board Exam Ocober 1991 -eermine !e e3cienc2 o& a 1"(( kA# '/(( # /0!ase# 0conneced alernaor# %!ic! oeraes a raed ouu %i! a o%er &acor o& ($. 8!e -C armaure resisance a 7(^C be%een erminals is (.( o!m. 8!e Ield akes 7( A a 1'( &rom !e excier euimen. =ricton and %indage losses are 1" k*# iron loss is /" k* and sra2 load losses are 1." k*. Assume !e eect)e armaure %inding resisance is 1." tmes !e -C )alue. A. 94.",$ C. 9/./"$ B. 9(./1$ -. 9'.,'$ 414. EE Board Exam Aril 1994 A !ree0!ase# 110k %2e0conneced s2nc!ronous alernaor !as a s2nc!ronous reacance o& o!ms er !ase bu negligible resisance. H& !e exciaton is suc! !a !e oen circui )olage is 14 k# deermine !e o%er &acor a !e maximum ouu. A. (.7, C. (.79/ B. (.77' -. (.7( 41". EE Board Exam Aril 1994 A !ree0!ase AC generaor is sul2ing o%er o a load o& /'(( k* a '/( )ols and a o%er &acor o& ,($. Assume !a !e loss o& !e line# !e generaor armaure and !e load is eual o !e 1($ o& !e load# %!a %ould be !e sa)ings in %a@s i& !e o%er &acor %ere raised o ($+ A. 1((#((( C. (#((( B. 14(#((( -. '/(#((( 41,. EE Board Exam Aril 199' A !ree0!ase urbo alernaor !as a reacance o& 1" o!ms and negligible resisance# !e mac!ine dra%s an armaure curren o& '" ( ameres a (. & lagging %!en running on 1'#((( )ols inInie bus0bars. H& !e seam admission is consan bu !e em& is raised b2 '($# calculae !e ne% oeratng &. A. (."47 C. (."(9 B. (.", -. (."7" 417. EE Board Exam Aril 19( A sandb2 -iesel generaor se %ill !a)e !e &ollo%ing loads< induct)e load dra%ing "( kA a (. o%er &acor \ig!tng load dra%ing '( kA a 1.( o%er &acor. A %!a o%er &acor %ill !e generaor oerae+ A. (."" lagging B. (.7' lagging C. (.'1 lagging -. (.94 lagging 41. EE Board Exam Aril 199' A '"( # /( 6 generaor sulies o%er o a arallel circui consistng o& a '( ! moor %!ose e3cienc2 is 9($ a (.( & lagging and a second load !a dra%s an aaren o%er o& 7 k A a uni2 &. -eermine !e s2sem react)e o%er. A. '/."' kAR C. 1(./41 kAR B. 1'.4/" kAR -. '(./4 kAR 419. EE Board Exam Ocober 19( 8%o alernaors A and B are oeratng in arallel sul2ing a load dra%ing 1((( kA a (.( o%er &acor lagging. H& alernaor A conribues "(( kA a (.,( o%er &acor lagging# deermine !e o%er &acor o& alernaor B. A. (.9' lagging B. (."' lagging C. (.9(1 lagging -. (.977 lagging 4'(. EE Board Exam Ocober 191 8%o alernaors are oeratng in arallel sul2ing a common load o& 4'" k* a (." o%er &acor lagging. Alernaor A conribues ,(( k AR a (.9' o%er &acor lagging. 5ol)e &or !e o%er &acor o& alernaor B. A. (.1/ lagging B. (./4 lagging C. (.(4 lagging -. (.'( lagging 4'1. EE Board Exam Aril 19 5iala2Mines# !as %o /0!ase# ,( 6 AC generaors oeratng in arallel. 8!e Irs uni !as a caaci2 o& 1((( kA and !e second uni !as a caaci2 o& 1"(( kA. 8!e Irs is dri)en b2 a rime mo)er so ad;used !a !e &reuenc2 &alls &rom ,1 6 a no0load o "9., 6 a &ull0load. 8!e second !as a dieren seedload c!araceristcs# !e &reuenc2 &alls &rom ,1.4 6 a no0load o "9.' 6 a &ull0load. *!en !ese alernaors are ;oinl2 deli)ering '((( k*# %!a is !e load o& eac! generaor+ A. 4 k*# 111, k* B. ,7 k*# 11// k* C. 91" k*# 1(" k* -. (4 k*# 119, k* 4''. REE Board Exam Marc! 199 8%o alernaors are dri)en b2 s!un moors. 8!e s!un moors !a)e seed0load droo c!araceristcs o& /$ and 4$ resect)el2. 8!e alernaors are in arallel and eac! carr2ing "( k*. 8!ere is no auomatc seed0load conrol. An additonal "( k* is s%ic!ed on. *!a are !e resultng loads o& !e alernaors assuming !a !e seed0load conrol o& eac! is no ad;used+ A. 7."7 k*# 71.4/ k* B. '."1 k*# ,7.49 k* C. 7" k*# 7" k* -. (./1 k*# ,9.,9 k* 4'/. EE Board Exam Aril 199 8!ere are %o alernaors# 1(( k*# /0!ase in arallel are dri)en b2 s!un moors %!ose seed0load droo c!araceristcs are as &ollo%s< Alernaor no. 1< no0load seed ,(( rm and !e &ull0load seed "/( rm %!ile alernaor no. '< no0load seed "9( rm and !e &ull0load ""( rm. =or %!a load %ill !e alernaors di)ide !e load euall2+ A. ,'.4" k* C. ,7."4 k* B. ,.7 k* -. ,4.,7 k* 4'4. EE Board Exam Aril 199 8!ere are %o alernaors# 1(( k*# /0!ase in arallel are dri)en b2 s!un moors %!ose seed0load droo c!araceristcs are as &ollo%s< Alernaor no. 1< no0 load seed ,(( rm and !e &ull0load seed "/( rm %!ile alernaor no. '< no0load seed "9( rm and !e &ull0load ""( rm. *!a is !e greaes load !a can be deli)ered %i!ou o)erloading ei!er alernaor+ A. 171.4/ k* C. 177."4 k* B. 1,.7 k* -. 1,4.,7 k* 4'". ECE Board Exam Aril 199 4/1.
8!e &reuenc2 o& )olage generaed b2 an 4',. A cerain /0!ase# sar0conneced# 1#((( kA# 4/'. A "(0 6 alernaor %ill run a !e greaes =ind !e &reuenc2 in kiloc2les er second in !e armaure o& a 1( ole# 1#'(( rm generaor. A. 1(((.( C. 1(.(( B. 1((.( -. (.1(( 11#((( )ol alernaor !as raed curren o& "'." ameres. 8!e dc resisance o& !e %inding er !ase is (./ o!m. 8!e es resuls are gi)en belo%< =ield curren \ine )olage OC 8es 1'." A 4'' )ols 5C 8es 1'." A "'." A -eermine !e &ull0load )olage regulaton a uni2 o%er &acor A. (.44$ C. (.,4$ B. (."4$ -. (.74$ 4 '7. A 1( MA# 1( k# /0!ase# "( 6# 1#"(( rm alernaor is arallel %i! eac! o!er muc! g reaer caaci2. 8!e momen o& inerta o& !e " ' roor is ' x 1( kg0m and !e s2nc!ronous reacance o& !e mac!ine is 4($. Calculae !e naural tme o& oscillaton. A. ./ ms C. 1(./ ms B. 9./ ms -. 11./ ms 4'. A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum o%er !a can be roduced. A. 1' M* C. 11 M* B. 1( M* -. 9. M* 4'9. A ,., k# 0conneced# /0!ase alernaor !as alernaor !a)ing 40oles and roatng a 1(( r..m. is 6er. A. ,( C. 1'( B. 7'(( -. 4"( ossible seed i& i is %ound &or oles. A. C. 4 B. , -. ' 4//. 8!e main disad)anage o& using s!or0ic! in alernaors is !a i A. reduces !armonics in !e generaed )olage B. reduces !e oal )olage around !e armaure coils C. roduces as2mmer2 in !e !ree !ase %indings -. increases Cu o& end connectons 4/4. 8!ree0!ase alernaors are in)ariabl2 conneced because A. magnetc losses are minimied B. less urns o& %ire are reuired C. smaller conducors can be used -. !ig!er erminal )olage is obained 4/". 8!e %inding o& a 40ole alernaor !a)ing /, slos and a coil san o& 1 o is s!or0 ic!ed b2 degrees. A. 14( C. '( B. ( -. 4( 4/,. H& an alernaor %inding !as a &ractonal ic! o& "K,# !e coil san is degrees. A. /(( C. /( B. 1"( -. ,( 4/7. 8!e !armonic %!ic! %ould be oall2 eliminaed &rom !e alernaor e.m.&. using a &ractonal ic! o& 4K" is rd ! A. / C. " ! ! B. 7 -. 9 a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum curren. A. './ kA C. 4./ kA 4/. =or eliminatng 7! !armonic &rom !e e.m.&. B. 4/9. H&# in an alernaor# c!ording angle &or /./ kA -. "./ kA 4/(. A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e o%er &acor a maximum o%er. A. (."/ C. (.7/ B. (.,/ -. (.4/ %a)e o& an alernaor# !e &ractonal0ic! mus be . A. 'K/ C. 7K B. "K, -. ,K7 &undamenal Tux %a)e is ]# is )alue &or " !armonic is A. "] C. '"] B. ]K" -. ]K'" ! 44(. Regarding disributon &acor o& an armaure %inding o& an alernaor %!ic! is saemen is &alse+ A. i decreases !e disributon o& coils sloKoleP increases B. !ig!er is )alue# !ig!er !e induced e.m.& er !ase C. -. i is no aeced b2 !e 2e o& %inding ei!er la or %a)e is no aeced !e number o& urns er coil 441. *!en seed o& alernaor is c!anged &rom /,(( r..m. o 1(( r..m. !e generaed e.m.&.K!ase %ill become A. one0!al& C. &our tmes B. %ice -. one0&our! 44'. 8!e magniude o& !e !ree )olages dros in an alernaor due o armaure resisance# leakage reacance and armaure reacton is solel2 deermined b2 A. load curren# Ha B. .&. o& !e load C. %!e!er i is a lagging or leading .&. load -. Ield consructon o& !e alernaor 44/. Armaure reacton in an alernaor rimaril2 aecs A. roor seed B. erminal )olage C. &reuenc2 o& armaure curren -. generaed )olage er !ase 444. Fnder no0load conditon# o%er dra%n b2 !e rime mo)er o& an alernaor goes o A. roduce induced e .m.& in armaure %inding B. mee no load loss C. roduce o%er in !e armaure -. mee Cu losses bo! in armaure and roor %indings 44". As load .& o& an alernaor becomes more leading# !e )alue o& generaed )olage reuired o gi)e raed erminal )olage A. increases B. remains unc!anged C. decreases -. )aries %i! roor seed 44,. *i! a load .&. o& uni2# !e eec o& armaure reacton on !e main0Ield Tux o& an alernaor is A. disortonal B. magneting C. demagneting -. nominal 447. A lagging loads# armaure reacton in an alernaor is A. cross0magneting B. demagneting C. non0 eect)e -. magneting 44. A leading .&.# !e armaure Tux in an alernaor !e roor Tux. A. ooses B. aids C. disors -. does no aec 449. 8!e )olage regulaton o& an alernaor !a)ing (.7"
leading .&. load# no0load induced e.m.& o& '4(( and raed erminal )olage o& /((( is . A. '( C. 1"( B. 0'( -. 0',.7 4"(. H&# in a /0U alernaor# a Ield curren o& "( A roduces a &ull0load armaure curren o& '(( A on s!or0circui and 17/( on oen circui# !en is s2nc!ronous imedance is o!m. A. .,, C. " B. 4 -. /4., 4"1. 8!e o%er &acor o& an alernaor is deermined b2 is A. seed B. load C. exciaton -. rime mo)er 4"'. =or roer arallel oeraton a.c. ol2!ase alernaors mus !a)e !e same A. seed C. B. )olage ratng -. kA ratng exciaton 4"/. O& !e &ollo%ing conditons# !e one %!ic! does O8 !a)e o be me b2 !e alernaors %orking in arallel is A. erminal )olage o& eac! mac!ine mus be !e same B. !e mac!ine mus !a)e !e same !ase roaton C. !e mac!ine mus oerae a !e same &reuenc2 -. !e mac!ine mus !a)e eual ratng 4"4. A?er %iring u %o /0U alernaors# 2ou c!ecked !eir &reuenc2 and )olage and &ound !em o be eual. Be&ore connectng !em in arallel# 2ou %ould A. c!eck urbine !ase B. c!eck !ase roaton C. lubricae e)er2!ing -. c!eck seam ressure 4"". Xero o%er &acor me!od o& an alernaor is used o Ind is A. e3cienc2 B. )olage regulaton C. armaure resisance -. s2nc!ronous imedance 4",. 5 ome engineers re&er Slams brig!L s2nc!roniaton o Slams darkL s2nc!roniaton because A. brig!ness o& lams can be ;udged easil2 B. i gi)es s!arer and more accurae s2nc!roniaton C. Ticker is more ronounced -. i can be er&ormed uickl2 4"7. H is ne)er ad)isable o connec a satonar2 alernaoro li)e bus0bars because i A. is likel2 o run as s2nc!ronous moor B. %ill ge s!or0circuied C. %ill decrease bus0bar )olage !roug! momenaril2 -. %ill disurb generaed e.m.&s. o& o!er alernaors conneced in arallel 4". 8%o identcal alernaors are running in arallel and carr2 eual loads. H& exciaton o& one alernaor is increased %i!ou c!anging is seam sul2 # !en A. i %ill keesul2ing almos !e same load B. kAR sulied b2 i %ould decrease C. is .&. %ill increase -. kA sulied b2 i %ould decrease 4"9. eeing is exciaton consan# i& seam sul2 o& an alernaor running in arallel %i! ano!er identcal alernaor is increased# !en A. i %ould o)er0run !e o!er alernaor B. is roor %ill &all back in !ase %i! resec o !e o!er mac!ine C. i %ill sul2 greaer orton o& !e load -. is o%er &acor %ould be decreased 4,(. 8!e load s!aring be%een %o seam0dri)en alernaors oeratng in arallel ma2 be ad;used b2 )ar2ing !e A. Ield sreng!s o& !e alernaors B. o%er &acors o& !e alernaors C. seam sul2 o !eir rime mo)ers -. seed o& !e alernaors 4,1. 5uirrel0cage bars laced in !e roor ole &aces o& an alernaor !el reduce !untng A. abo)e s2nc!ronous seed onl2 B. belo% s2nc!ronous seed onl2 C. abo)e and belo% s2nc!ronous seed bo! -. none o& !e abo)e 4,'. =or a mac!ine on inInie bus act)e o%er can be )aried b2 A. c!anging Ield exciaton B. c!anging o& rime mo)er seed C. bo! A and B abo)e -. none o& !e abo)e 4,/. Ma;ori2 o& alernaors in !e use !a)e A. B. C. -. re)ol)ing ac armaure %inding satonar2 Ield 2e consructon re)ol)ing Ield 2e consructon none o& !e abo)e 4,4. 8!e saor o& an alernaor is identcal o !a o& a A. B. C. -. dc generaor /0!ase inducton moor 10!ase inducton moor Rosenberg generaor B. ac C. bo! dc and ac -. none o& !ese 4,7. 8!e ac armaure %inding o& an alernaor oeraes a !e Ield %inding. A. !e same as B. muc! lesser )olage !an C. muc! !ig!er )olage !an -. none o& !e abo)e 4,. 8!e salien0ole consructon &or Ield srucure o& an alernaor is generall2 used &or mac!ine. A. '0ole B. 40ole C. 0ole -. none o& !ese 4,9. An alernaor is sometmes called generaor. A. s2nc!ronous B. as2nc!ronous C. Rosenberg -. none o& !ese 47(. A urbo0alernaor uses A. salien0ole Ield srucure B. non0salien0 ole Ield srucure C. roatng ac armaure %inding -. none o& !e abo)e 471. 8!e non0salien ole Ield consructon is used &or generaor. A. lo%0seed B. medium0seed C. !ig!0seed -. none o& !ese 47'. 8!e ac armaure %inding o& an alernaor is A. B. C. -. al%a2s sar0conneced generall2 dela0 conneced sar0dela conneced none o& !e abo)e 47/. \o%0seed alernaors are dri)en b2 A. B. C. -. !2draulic urbines seam engines seam urbines none o& !ese 474. 6ig!0seed alernaors are dri)en b2 A. B. C. -. diesel engines !2draulic urbines seam urbines none o& !ese 4,". 8!e saor o& an alernaor rarel2 uses slos. A. %ide0oen 2e B. semi0closed 2e C. closed 2e -. none o& !ese 47". 8!e air0ga in an alernaor is in an inducton mac!ine. A. muc! s!orer !an B. muc! longer !an C. abou !e same as -. none o& !ese 4,,. 8!e Ield %inding o& an alernaor is excied. A. dc 47,.
8!e saor o& an alernaor is %ound &or on !e roor. A. B. C. -. more number o& oles !an less number o& oles !an !e same number o& oles as none o& !e abo)e 477. 8urbo0alernaors !a)e roors o& A. B. C. -. small diameer and long axial leng! large diameer and long axial leng! large diameer and small axial leng! same diameer and axial leng! 47. 8!e roor o& a urbo0alernaor is made c2lindrical in order o reduce . A. edd2 curren loss B. !2seresis loss C. %indage losses -. none o& !ese 479. 8!e number o& c2cles generaed in a ,0ole alernaor in one re)oluton is A. / B. , C. "( -. none o& !ese 4(. 8!e seed a %!ic! a ,0ole alernaor s!ould be dri)en o generaor "( c2cles er second is A. 1#"(( rm B. 1#((( rm C. " (( rm -. none o& !ese 41. 8!e &reuenc2 o& em& generaed in an 0ole alernaor running a 9(( rm is A. "( 6 B. ,( 6 C. 1'( 6 -. none o& !ese 4'. Hn case o& a 40ole mac!ine# 1 mec!anical degree corresonds o elecrical degree. A. ' B. 4 C. -. none o& !ese 4/. =or !e same ratng# !e sie o& lo%0seed alernaor is !a o& !ig!0seed alernaor. A. abou !e same B. more !an C. less !an -. none o& !ese 44. 8!e s2nc!ronous reacance o& an alernaor is due o . A. leakage Tux B. d.c. Ield exciaton C. armaure reacton -. none o& !e abo)e 4". 8!e s2nc!ronous reacance o& an alernaor is generall2 armaure resisance. A. " tmes smaller !an B. " tmes greaer !an C. 1( o 1(( tmes greaer !an -. 1( tmes smaller !an 4,. 8!e s2nc!ronous reacance o& an alernaor as !e iron is sauraed. A. decreases B. increases C. remains unc!anged -. none o& !e abo)e 47. Hn an alernaor# !e eec o& armaure reacton is minimum a o%er &acor o& . A. (.,, lagging B. (.,, leading C. -. (." lagging uni2 4. H& !e lagging load .&. o& an alernaor is decreased# !e demagneting eec o& armaure reacton . A. remains !e same B. is decreased C. is increased -. none o& !ese 49. A /0!ase alernaor generaes an oen0circui !ase )olage o& 4((( %!en excitng curren is "( A !e s!or0circui curren &or !e same exciaton being (( A. 8!e s2nc!ronous reacance er !ase is A. ( o!ms B. " o!ms C. 1" o!ms -. none o& !ese 49(. A /( MA# 1" k alernaor %ill !a)e a er !ase nominal imedance o& A. 9 o!ms B. 1" o!ms C. 7." o!ms -. none o& !ese 491. *!en load on an alernaor is increased# !e erminal )olage increases i& !e load & is A. uni2 C. leading B. lagging -. ero 49'. 8!e e3cienc2 o& !e urbo0alernaor %i! increase in seed. A. decreases B. increases C. remains unc!anged -. none o& !e abo)e 49/. 8!e &ull0load e3cienc2 o& !e alernaor %i! !e sie o& !e mac!ine. A. increases B. decreases C. remains unc!anged -. none o& !e abo)e 494. =or !e same o%er ratng# an alernaor is !a o& a dc generaor. A. larger in sie !an B. smaller in sie !an C. o& !e same sie as -. none o& !e abo)e 49". Hn !e armaure %inding o& an alernaor# !e coil san &alls s!or o& &ull0ic! b2 ,(^ elecricalP. 8!e ic! &acor is A . (.,, B. (." C. (.'" -. none o& !ese 49,. A /0!ase alernaor !as / slos er ole. 8!e disributon &acor o& !e %inding is A. (.,, B. (." C. 1 -. none o& !ese 497. 8!e disad)anage o& a s!or0ic!ed coil is !a A. B. C. -. !armonics are inroduced %a)e&orm becomes non0sinusoidal )olage round !e coil is reduced none o& !e abo)e 49. 8!e )olage regulaton o& an alernaor &or a & o& (. lagging is a uni2 &. A. greaer !an B. smaller !an C. !e same as -. none o& !ese 499. 8!e )olage regulaton o& an alernaor is larger !an !a o& a dc generaor because o& A. larger armaure resisance B. large leakage reacance C. comlex eecs o& armaure reacton -. none o& !e abo)e "((. 8!e er !ase dc armaure resisance o& an alernaor is (." o!m. 8!e eect)e ac armaure resisance %ould be abou A. (." o!m C. 4 o!ms B. (.7" o!m -. (.'" o!m "(1. 8!e dc armaure resisance o& a 0conneced alernaor measured across is %o erminals is (." o!m. 8!e er !ase resisance is A. (." o!m C. (.'" o!m B. 1 o!m -. 1." o!ms "('. 8!e dc armaure resisance o& a dela0 conneced alernaor measured across is %o erminals is 1 o!m. 8!e er !ase dc resisance is A. / o!ms B. 1." o!ms C. (.// o!m -. none o& !ese C. ouu k* %ill c!ange -. none o& !e abo)e "(". 8!e disributon o& load be%een %o alernaors oeratng in arallel can be c!anged b2 c!anging A. !ase seuence B. Ield exciaton o& alernaors C. dri)ing orues o& rime mo)ers -. none o& !e abo)e "(,. *!en a number o& alernaors are oeratng in arallel# !e o%er &acor a %!ic! eac! oeraes is deermined b2 A. o%er &acor o& !e load B. dri)ing orue o& !e rime mo)er C . is Ield exciaton -. none o& !e abo)e "(7. H& !e exciaton o& an alernaor oeratng in arallel %i! o!er alernaors is increased abo)e !e normal )alue o& exciaton#
is A. B. C. -. & becomes more lagging & becomes more leading ouu curren decreases ouu k* decreases "(. 8!e )olage o& !e bus0bar o %!ic! se)eral alernaors are aralleled ma2 be raised b2 simulaneousl2 o& all alernaors. A. increasing Ield exciaton B. decreasing Ield exciaton C. increasing inu o rime mo)ers -. decreasing inu o rime mo)ers "(9. 8!e &reuenc2 o& !e s2sem %i! %!ic! se)eral alernaors are aralleled can be increased b2 simulaneousl2 o& all generaors. A. increasing Ield exciaton B. decreasing Ield exciaton C. increasing !e seed o& rime mo)ers -. decreasing !e seed o& rime mo)ers "1(. 8!e alernaors dri)en b2 do no !a)e a endenc2 o !un. A. diesel engines B. %aer urbines C. seam urbines -. none o& !ese "11. -amer %indings are used in alernaors o A. B. C. -. re)en !untng reduce %indage losses ac!ie)e s2nc!ronism none o& !e abo)e "(/. 8!e under excied alernaor sulies . A. B. C. -. lagging AR leading AR no react)e o%er none o& !e abo)e "(4. H& !e exciaton o& an alernaor oeratng in arallel %i! o!er alernaors is decreased# is A. & becomes more leading B. & becomes more lagg ing "1'. 8!e ratng o& an alernaor is exressed in A. k* B. 6: C. -. kA kAR Fnsol)ed roblems "1/. REE Board Exam 5eember '((4 A /#,(( # "(( kA# ,( 6# /0!ase conneced generaor on es 2ields !e &ollo%ing resuls< Mec!anical and iron losses is 1( k* Ield curren a &ull load 1(($ .&. is "( A Ield curren a &ull0load ($ .&. is 7( A resisance er !ase o& armaure %inding is (.4 o!m. 8!e excier )olage is consan a 1'( )ols and )olage curren is conrol is done b2 means o& r!eosa. -eermine !e &ull0load armaure curren a ($ lagging .&. A. 9,." A C. ,4.' A B. 99. A -. (.' A "14. A 40ole# 1'(( rm alernaor %ill generae em& a A. "( 6 B. 4( 6 C. -. ,( 6 '" 6 "1". 8!e san &or a &ull0ic! coil %ound &or six oles is A. B. C. -. 1( degrees mec!anical 9( degrees mec!anical ,( degrees mec!anical 4" degrees mec!anical A. 7"( rm B. 1"(( rm C. -. /((( rm 144( rm "'/. 8!e magniude o& !e resulan magnetc Ield roduced b2 a !ree0!ase curren To%ing !roug! a !ree0!ase %inding is eual o A. !e maximum )alue o& Tux due o an2 one !ase B. 1." tmes !e maximum )alue o& Tux due o an2 one !ase C. !al& !e )alue o& maximum Tux due o an2 one !ase -. %ice !e maximum )alue o& Tux due o an2 one !ase "'4. olage regulaton o& an alernaor ma2 be negat)e %!en A. !e load o%er &acor is lagging B. !e load o%er &acor is leading C. i is loaded be2ond is &ull0load caaci2 -. !e mac!ine is run a )er2 lo% seeds "1,. 8!e ic! &acor &or a %o0!irds s!or0ic! coil is A. (." B. (.,, C. -. (.,, (.7(7 "17. 8!e armaure Tux ooses !e main Ield Tux %!en !e load o%er &acor is A. uni2 C. leading B. ero lagging -. ero (. leading "1. 8!e armaure Tux !els !e main Ield Tux %!en !e load o%er &acor is A. uni2 C. B. ero lagging -. leading (. lagging ero "19. A commercial alernaor !as A. roatng armaure and satonar2 Ield B. satonar2 armaure and roatng Ield C. bo! armaure and Ield roatng -. bo! armaure and Ield satonar2 "'". :ic! &acor &or "K, s!or ic! coil is A. (.9,, B. (.// C. -. 1.( /.4"4 "',. -isributon &acor &or a %inding !a)ing / slosKoleK!ase and a slo angle o& '( degrees is A. (.9, C. (." B. 1.( -. (.7(7 "'7. Armaure reacton in an elecrical mac!ine is !e eec o& A. armaure Tux on !e main Tux B. !ea roduced on !e armaure %indings C. armaure curren on !e ouu -. armaure Tux on !e ouu "'. An inInie bus0bar s!ould mainain A. inInie &reuenc2 and inInie )olage B. consan &reuenc2 and consan )olage C. consan &reuenc2 bu )ariable )olage -. )ariable &reuenc2 and )ariable )olage "'(. 8!e saor core o& a s2nc!ronous mac!ine is made u o& laminaed s!ees o A. increase !e magniude o& Tux roduced B. make !e mac!ine lig!er in %eig! C. minimie !e edd2 c urren loss -. minimie !e !2seresis loss "'1. Hn alernaors damer %indings are used o A. B. C. -. reduce edd2 curren loss re)en !untng make !e roor d2namicall2 balanced reduce armaure reacton "''. A 4 Dole "(06 s2nc!ronous mac!ine runs a "'9. re&ers o an AC generaor. A. Commuaor B. Moor ACP C. -. Roor Alernaor "/(. Hn !uge alernaors# !e mo)ing ar is A. B. C. -. brus!es armaure oles none o& !e abo)e "/1. Hn case o& alernaor# !e saor &rame ser)es A. o roec !e %!ole mac!ine B. C. -. as a reurn a! &or !e Tux o !old !e armaure samings o )entlae !e armaure "41. 5eam urbo0alernaors are muc! smaller in "/'. Alernaors mosl2 %ok on roatng Ield 2e rincile %!ic! is dieren &rom d.c. mac!ines %!ere !e Ield is satonar2. 8!ere&ore alernaors A. donL obe2 =arada2Ls la% B. %ork on =arada2Ls la%
C. do no obe2 \enLs la% -. obe2 \enLs la% "//. 6ig! seed alernaors !a)e a roor consructon A. similar o d.c. mac!ines B. o& non0salien 2e C. o& salien02e -. none o& !e abo)e c2lindrical roor 2e alernaors is A. !ig! d.c. )olage B. !ig! a.c. )olage C. lo% d.c. )olage -. lo% a.c. )olage coil san &acor is A. (. B. (.,, C. -. (.7, (.9,, )ariable &reuenc2 deInie currens deInie &reuencies deInie o%er &acor "/,. 8!e sandard ractce# no%ada2s in alernaors is o !a)e A. roatng Ield B. roatng armaure C. ei!er roatng Ield or roatng armaure -. none o& !e abo)e "/7. Hn o%er generatng satons !ermal satonsP !e usual number o& oles emlo2ed in alernaors are A. %en2 &our B. &or2 eig! C. !ir2 %o -. none o& !e abo)e "/. 8!e diameer o& !ig! seed urbo alernaors as comared o !2droelecric ones are A. smaller because seed is !ig! B. smaller because seed is less C. larger because seed is !ig! -. none o& !e abo)e less %eig! o& !e entre armaure increased o& generaed em& er !ase "44. *!en !e o%er &acor o& load is uni2# !e armaure Tux o& an alernaor %ill be A. demagneting B. suare %a)e &orm C. cross0magneting -. none o& !e abo)e "4". An alernaor is caable o& deli)ering o%er a a artcular &reuenc2. 8!e &reuenc2 can be increased b2 A. increasing armaure seed B. re)ersing !e armaure roaton C. increasing !e curren sulied in !e Ield elecromagnes -. re)ersing !e Ield olari2 "4,. H& !e inu o& !e rime mo)er o& an alernaor is ke consan bu !e exciaton is increased !en A. kA %ill be leading B. kA %ill be lagging C. k* %ill be c!anged -. !e o%er &acor o& !e load %ill remain consan "47. =or %o alernaors oeratng in arallel# i& !e "/9. 8!e sli rings emlo2ed in a !ree0!ase alernaors in !2drosaton are insulaed &or A. exra !ig! ension )olage B. lo% )olage C. &ull armaure )olage -. )er2 !ig! )olage "4(. *!en !e seed o& alernaor increases# !e C. -. is more !an one number o& slos er ole er !ase resuls in A. reducton o& irregularites roduced in !e %a)e&orm B. econom2 o& maerials used in !e %inding C. -. "/". Alernaors are generall2 designed o generae &reuenc2 A. decreases B. remains !e same "4'. =or a coil !a)ing a san o& 'K/ or ole ic!# !e "4/. -isributng !e armaure %inding in alernaors "/4. 8!e )olage alied o !e Ield o& a roatng A. B. C. -. sie !an %aer0urbine alernaors &or a gi)en ouu. 8!is is so because A. seam urbo alernaors are buil %i! smaller caacites B. seam urbo alernaors run a !ig! seed C. seam urbo alernaors !a)e long roors -. all o& !ese increases c!anges load s!ared b2 one o& !em is o be increased# is Ield exciaton is A. o be sreng!ened keeing inu orue same B. o be %eakened keeing inu orue same C. -. o be ke consan bu inu orue s!ould increase none o& !e abo)e "4. A &our0ole# !ree0!ase# "(06 sar conneced AC generaor !as '4 saor slos. 8!ere are , conducors er slo and a sinusoidall2 disribued Tux er ole o& ,"m*b. =ind !e erminal )olage on oen circui# i& !e coil san &acor is uni2. A. "4,.(" C. ",.4 B. "79.44 -. "".,' "49. A '#"(( kA# !ree0!ase# ,(06# ,., k %2econneced alernaor !as a Ield resisance o& (.4" Z and an armaure resisance o& (.(" Z er !ase. 8!e Ield curren a &ull load (." o%er &acor is '(( A. 8!e sra2 o%er losses amoun o ' k*. Calculae !e e3cienc2 o& !e alernaor a &ull0load# (." o%er &acor lagging. A. 9/.7$ C . 9".'$ B. 94.$ -. 9,./$ ""(. A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , Z er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. Calculae !e maximum o%er !a can be de)eloed b2 !e alernaor a !is exciaton. A. 1' M* C. 9. M* B. 11 M* -. 1( M* ""1. A !ree0!ase alernaor !as , slos er ole er !ase. -eermine !e disributon &acor. A. (.977 C. (.9,/ B. (.9", -. (.94 ""'. A !ree0!ase sar conneced AC generaor is raed a '." MA# 11 k# ,( 6. 8!e generaor !as a negligible resisance and a s2nc!ronous reacance o& '( o!ms er !ase. 8o %!a )alue %ill !e erminal )olage rise %!en &ull load a ($ & lagging is s%ic!ed0o+ A. 14.' k C. 1"./ k B. 1/." k -. 1'.7 k ""/. A "((( kA# /0# 1( k# "( 6 alernaor runs a 1"(( rm conneced o consan &reuenc2# consan )olage busbars. H& !e momen o& 4 inerta o& entre roatng s2sem is 1." x 1( kg' m and !e sead2 s!or circui curren is " tmes !e normal &ull load curren. Calculae !e naural tme eriod o& oscillaton. A. 1." sec C. 1./ sec B. 1.4 sec -. 1.' sec ""4. A !ree !ase %2e conneced ac generaor is raed 1"(( kA# 11((( . 8!e eect)e resisance and s2nc!ronous reacance er !ase are 1." o!ms and /( o!ms resect)el2. 8o
%!a )alue %ill !e erminal )olage rise %!en &ull0load a (. & lagging is s%ic! o. A. 14 k C. 1" k B. 1/ k -. 1' k """. A 1(( MA 1( k urbo0alernaor !as a curren limitng reacor o& (.1,' o!ms in is neural. 8!e er uni )olage o& !e reacor reacance based on !e generaor ratng is A. (.(" C. (.('" B. (." -. (.'" "",. A !ree0!ase# ,0ole# 7'0slo armaure o& a s2nc!ronous generaor is %ound using a %o la2er la coil !a)ing '( conducors er coil %i! a ic! o& /.//$. 8!e Tux er ole is 4#((#((( Max%ells. H& !e roor o& !e generaor is dri)en a a seed o& 1'(( rm# calculae !e induced em& er !ase. oe< 8!ere are ' coils in 1 slo. A. "#,( C. "#",4 B. "#/9( -. "#"4 ""7. A '0ole !ree !ase "( 6 0conneced AC generaor !as 9 slos er ole and , conducors er slo. *!a is !e Tux er ole i& !e )olage on oen circui is 1.1 k line0oline+ Assume a coil san o& uni2. A. (.1,"7 *b C. (.1"(7 *b B. (.174' *b -. (.17' *b "". A 1 MA# 11 k# !ree0!ase 0conneced s2nc!ronous generaor !as a s2nc!ronous reacance o& " o!ms and a negligible resisance er !ase. A a cerain Ield curren !e generaor deli)ers raed load a (.9 lagging o%er &acor a 11 k. =or !e same exciaton# %!a is !e erminal )olage a (.9 leading o%er &acor &ull0load+ A. 11., k C. 11./ k B. 11.4 k -. 11." k ""9. A '"(( kA# ,,(( s2nc!ronous urbo alernaor is oeratng a &ull load and (. & lagging. 8!is mac!ine !as a s2nc!ronous reacance er !ase o& 1( .4 o!ms and negligible resisance. Calculae !e ercenage )olage regulaton. A. 4.",$ C. 4".4$ B. 4'./"$ -. 4/.9,$ ",(. 8%o alernaors are conneced in arallel. 8!e oal load is 4'"( k* a (." o%er &acor lagging. Alernaor oeraes %i! a load o& '1'" k* a (.7(7 o%er &acor lagging. -eermine !e kA load o& alernaor B. A. ''4" kA C. '1" kA B. '(7 kA -. '41( kA ",1. 8!e be s and !e mos accurae me!od &or deermining !e )olage regulaton is A. s2nc!ronous imedance me!od B. mm& me!od C. em& me!od -. :oer riangle me!od ",'. A /0!ase# 0ole generaor is dela conneced. 8!e erminal )olage is '4(( %!ile !e line curren is "(( ameres. H& !e mac!ine is con)ered o %2e# %!a %ill be !e erminal )olage in )ols+ A. 4(( C. 4,(( B. 41"7 -. /(( ",/. A /0!ase# 0ole dela conneced generaor !as a line curren o& "(( ameres. H& con)ered in %2e# %!a is !e olerable curren+ A. /71." A C. '4".1 A B. '.7 A -. /1".' A ",4. A single0!ase alernaor gi)es '"( ameres a 1#'(( )ols. *!a is !e ouu o& !e mac!ine in A+ A. /(( C. 4(( B. 4"( -. /"( ",". A. B. C. -. ",,. A. B. C. -. ",7. A. B. C. -. Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e er !ase dc armaure resisance o& an alernaor is (." o!m. 8!e eect)e ac armaure resisance %ould be abou 5elec one< a. (." o!m b. (.'" o!m c. (.7" o!m d. 4 o!ms =eedback 8!e correc ans%er is< (.7" o!m Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Calculae !e &orce !a %ill be exered on !e scale in a ron2 brake es %!en a '( 6:# 1#4(( rm moor is oeratng a &ull0load. 8!e leng! o& !e brake arm is / ? and !e are %eig! o& !e brake is /.7" lbs. 5elec one< a. ',., lbs b. none o& !ese c. ,'.7, lbs d. '.7, lbs =eedback 8!e correc ans%er is< '.7, lbs Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4 ole# "( 6 single0!ase inducton moor !as a sli o& "$. 8!e seed o& !e moor %ill be 5elec one< a. none o& !ese b. 1"(( rm c. 14'" rm d. 1'(( rm =eedback 8!e correc ans%er is< 14'" rm Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc generaor !as a mec!anical e3cienc2 a 9.'$ and an elecrical e3cienc2 o& 9".9$. =ind !e commercial e3cienc2. 5elec one< a. 97.4$ b. 9,."$ c. 9$ d. 94.'$ =eedback 8!e correc ans%er is< 94.'$ Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e ne cross secton o& a rans&ormer is '( suare inc!es. 8!e maximum Tux densi2 is 11 kilogausses. 8!e &reuenc2 is ,( 6. H& !ere are 1#((( urns in !e rimar2# deermine !e rimar2 induced em&. 5elec one< a. /94" b. /"( c. /"9( d. /7( =eedback 8!e correc ans%er is< /7( Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /#,(( )ols !ree0!ase sar conneced urbo s2nc!ronous generaor o& s2nc!ronous reacance o& (." o!m er !ase and negligible resisance is sul2ing /(#((( kA a (. & lagging o a large o%er s2sem. H& !e seam sul2 is cu0o# calculae !e amoun o& curren !a !e generaor %ill !en carr2 assuming negligible losses. 5elec one< a. /'/ A b. /7( A c. /9(1 A d. /(94 A =eedback 8!e correc ans%er is< /7( A Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 40ole '/(0# ,( 6# !ree0!ase inducton moor direcl2 dri)es a ,0ole alernaor. -eermine !e ouu
&reuenc2. Assume a sli o& /$ in !e moor. 5elec one< a. 9(.( 6 b. ,., 6 c. .4 6 d. 7./ 6 =eedback 8!e correc ans%er is< 7./ 6 Queston Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "(0k* 4,0)ol s!un generaor !as a )olage regulaton o& .7 ercen. Calculae !e no0 load erminal )olage. 5elec one< a. 47" b. 49( c. "(" d. "(( =eedback 8!e correc ans%er is< "(( Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind !e )alue o )olage regulaton !a)ing a dc )olage o& ,7 %i!ou load and %i! &ull load curren dra%n !e ouu )olage dros o 4' . 5elec one< a. /'."$ b. 1".9$ c. "9."$ d. ,'.,$ =eedback 8!e correc ans%er is< "9."$ Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A , ole la %ound s!un moor akes /(( A %!en !e seed is "(( rm. 8!e Tux er ole is (.(, *b and !e armaure !as a 7( conducors. eglectng !e s!un Ield curren# calculae !e ouu !orseo%er o& !e moor. Assume a consan loss o& 4$. 5elec one< a. 1, ! b. 17' ! c. 1," ! d. 17" ! =eedback 8!e correc ans%er is< 1, ! Queston 11 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e induced em& in eac! coil side o& a cerain alernaor %inding is calculaed as 1( )ols# i& !e measured )olage across !e coil is 19./' )ols# !e %inding is s!or b2 !o% man2 elecrical degrees+ 5elec one< a. '( deg b. /( deg c. ,( deg d. "( deg =eedback 8!e correc ans%er is< /( deg Queston 1' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!or s!un comound generaor deli)ers 1"( A a a erminal )olage o& '/( . 8!e s!un Ield curren is '." A. 8!e resisance o& !e armaure# series Ield and di)erer are (.(/' o!m# (.(1" o!m and (.(/ o!m# resect)el2. Calculae !e elecrical e3cienc2 o& !e generaor a !is load. 5elec one< a. 9".7$ b. 94.'$ c. 9/.$ d. 9,.4$ =eedback 8!e correc ans%er is< 9".7$ Queston 1/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "((0!# ''(( # /0!ase# sar0conneced s2nc!ronous moor !as a s2nc!ronous imedance o& (./ G ;/ o!m er !ase. -eermine !e induced em& er !ase i& !e moor %orks on &ull load %i! an e3cienc2 o& 94$ and a o%er &acor o& (. leading. 5elec one< a. 1/,( b. 1/"4 c. 14(' d. 1"'' =eedback 8!e correc ans%er is< 1/,( Queston 14 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(0!# 40ole# '"06# /0!ase inducton moor is aking 9#1(( %a@s &rom !e line. 8!e core loss is '9( %a@s saor coer loss is ", %a@s roor coer loss is 44" %a@s and !e &ricton and %indage loss is 1'1 %a@s. -eermine !e ouu orue in e%onmeer. 5elec one< a. 1(/./' b. 19(./' c. 17.7, d. 1"(.", =eedback 8!e correc ans%er is< 1(/./' Queston 1" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A simlex la %ound armaure !as "( conducors and carries a curren o& 1'" amere er armaure curren a!. H& !e Tux er ole is '( m*b# calculae !e elecromagnetc orue de)eloed b2 !e armaure. 5elec one< a. '(7.,/ 0m b. '/(.77 0m c. '"'.7' 0m d. '1(.,4 0m =eedback 8!e correc ans%er is< '/(.77 0m Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e ulle2 o& an old gen0se !as a diameer o& '( inc!es. 8!e bel exers a ull o& /"/ lbs on a ulle2. 8!e gen0se runs a 9(( rm. *!a is !e aroximae ratng o& !e gen0se+ 5elec one< a. '"( b. 7" c. '(( d. / =eedback 8!e correc ans%er is< / Queston 17 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(0kA# '(((K4(( # single0!ase rans&ormer !as rimar2 and secondar2 %inding imedances o& ".( G ;1( and (.' G ;(.4" o!ms# resect)el2. Calculae !e )olage across !e secondar2 erminals a &ull load# ($ o%er acor lagging# %!en !e rimar2 is sulied %i! '#((( )ols. 5elec one< a. 4(( b. /79 c. /94 d. /" =eedback 8!e correc ans%er is< /79 Queston 1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor sulies a load o& "#"(( k*# ''( )ols# s!un generaor in !e =EF laboraor2 is '/' )ols and raed load )olage is ''( )ols. 8!e armaure resisance including brus!es is (.(', o!m and !e resisance o& !e s!un Ield resisance is "' o!ms. * !a is !e induced elecromagnetc &orce a raed load+ 5elec one< a. ''4.", b. ''1./, c. '',.(' d. ''7.(" =eedback 8!e correc ans%er is< '',.(' Queston 19 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A 1" ! ''( )ol# 1'(( rm s!un moor akes "( Ameres. Hs armaure resisance is (.1 o!m and Ield resisance is ''( o!ms. Brus! conac )olage dro is ' )ols. =ricton and %indage loss is 4(( %a@s and sra2 load loss o& 1$ o& !e ouu. Calculae !e e3cienc2. 5elec one< a. 9'.4$ b. 91.$ c. 9.4$ d. 94.,$ =eedback 8!e correc ans%er is< 91.$ Queston '( Correc Mark 1.(( ou o& 1.(( =lag
ueston Queston ex 52nc!ronous imedance es is aken on a /0!ase generaor. Fnder s!or circui conditon# !e curren is !e !ree lines are ',.' A# '/.7 A# and '7.4 A. *!a curren s!ould be used &or !e es+ 5elec one< a. ',./ A b. '".4 A c. '4., A d. '".7 A =eedback 8!e correc ans%er is< '".7 A Queston '1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e san &or a &ull0ic! coil %ound &or six oles is 5elec one< a. 9( degrees mec!anical b. 1( degrees mec!anical c. 4" degrees mec!anical d. ,( degrees mec!anical =eedback 8!e correc ans%er is< ,( degrees mec!anical Queston '' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A single0!ase rans&ormer is raed 4#1,(0 rimar2 and '"(0 secondar2. H !as 1#"(( urns in !e rimar2 and )olage regulaton o& $. *!a s!ould be !e number o& urns in !e secondar2 %inding+ 5elec one< a. urns b. 9' urns c. , urns d. 9( urns =eedback 8!e correc ans%er is< 9( urns Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor deli)ers 19" A a a erminal )olage o& '"( . 8!e armaure resisance and !e s!un Ield resisance are (.(' and (.(" o!m resect)el2. 8!e iron and !e &ricton losses are eual o 9"( *. =ind !e commercial e3cienc2 o& !e generaor. 5elec one< a. 9".9$ b. 9.'$ c. 9/."$ d. 94.'$ =eedback 8!e correc ans%er is< 94.'$ Queston '4 Correc Mark 1.(( ou o& 1 .(( =lag ueston Queston ex A six0ole# /0!ase AC generaor !as 7' slos# !e coil san is 1'. *!a is !e ic! &acor+ 5elec one< a. (.9,, b. (.9/9 c. 1.((( d. (.9" =eedback 8!e correc ans%er is< 1.((( Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!a is !e se angle o& a ermanen0magne seer moor !a)ing saor oles and 4 roor oles+ 5elec one< a. 4" degrees b. ,( degrees c. /( degrees d. 1" degrees =eedback 8!e correc ans%er is< 4" degrees Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4(( series moor !as a Ield resisance o& (.' o!m and an armaure resisance o& (.1 o!m. 8!e moor akes /( A o& curren a 1((( rm %!ile de)eloing &ull0load orue. *!a is !e moor seed %!en !is moor de)elos ,($ o& &ull load orue+ 5elec one< a. 11/"." rm b. 1/('.4 rm c. 1'"7.' rm d. 1'97., rm =eedback 8!e correc ans%er is< 1'97., rm Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '((0kA rans&ormer !as an imedance o& 1"$ and !e o%er &acor o& !e load is "$. 8!e rimar2 )olage is ,#((( )ols %!ile !e coer loss is 1" k*. =ind !e ercenage )olage regulaton. 5elec one< a. .91$ b. '/.,7$ c. 1".7$ d. 1/.49$ =eedback 8!e correc ans%er is< 1/.49$ Queston ' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A single !ase generaor %i! &ull load c urren o& 4"( ameres a '4(( )ols !as (.( o!m resisance and s2nc!ronous reacance is '. o!ms. -eermine !e )olage regulaton in ercen a 7"$ o%er &acor lagging. 5elec one< a. 7" b. 41 c. "" d. ,4 =eedback 8!e correc ans%er is< 41 Queston '9 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A searael2 excied generaor generaes '/( )ols %!en dri)en a 1'(( rm. H& !e Tux is decrease b2 1($# %!a is !e ne% em& %i! seed remains !e same+ 5elec one< a. '"/ )ols b. '(7 )ols c. '/( )ols d. '", )ols =eedback 8!e correc ans%er is< '(7 )ols Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex eglectng sauraton# i& curren aken b2 a series moor is increased &rom 1( A o 1' A# !e ercenage increase in is orue is ercen. 5elec one< a. 44 b. /(." c. 1,., d. '( =eedback 8!e correc ans%er is< 44 Queston /1 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A /( MA# 1" k !ree0 !ase alernaor %ill !a)e a er !ase nominal imedance o& . 5elec one< a. 7." o!ms b. 9 o!ms c. 1" o!ms d. none o& !ese =eedback 8!e correc ans%er is< 7." o!ms Queston /' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "(( kA# 1/'((K'4(( )ols ,( 6 single !ase rans&ormer !as a 4$ reacance and 1$ resisance. 8!e leakage reacance and resisance o& !e lo% )olage %inding are (.'" and (.("" o!m# resect)el2. Calculae !e leakage reacance and resisance in o!ms o& !e 6 %inding. 5elec one< a. ,."/ am 1.7 b. ,./ am 1.' c. 4., am 1.", d. ,.'/ am 1." =eedback 8!e correc ans%er is< ,./ am 1.' Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a rans&ormer# !e iron loss is &ound o be 4' * a /( 6 and 9( * a ,( 6 measured a !e same Tux densi2. *!a is !e !2seresis and edd2 curren loss a ,( 6+ 5elec one< a. 7 * am 1' * b. ,( * am /( * c. /( * am , * d. 1' * am 7 * =eedback 8!e correc ans%er is< 7 * am 1' * Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A
'"0kA disributon rans&ormer oeraes a 1'($ load# (./ & lagging &or 1 !our a &ull0load# (.9 lagging & &or / !ours "($ load a uni2 & &or !ours and 1($ load a (. leading & &or !e res o& !e da2. H& core loss is 1"( %a@s and &ull load coer loss is "(( *# %!a is !e all0da2 e3cienc2 o& !e rans&ormer+ 5elec one< a. 97.14$ b. 94.'/$ c. 9,.,$ d. 9'.,$ =eedback 8!e correc ans%er is< 9,.,$ Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase alernaor !as / slos er ole. 8!e disributon &acor o& !e %inding is 5elec one< a. 1 b. (." c. none o& !ese d. (.,, =eedback 8!e correc ans%er is< 1 Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An oen0 dela conneced rans&ormer bank ser)es a balanced /0!ase load o& 4( kA a '/( and (.,, & lagging. 5ol)e &or !e real o%er and & a %!ic! eac! rans&ormer is oeratng. 5elec one< a. 11."4 k* a (." & and '/.(9 k* a uni2 & b. 11."4 k* a (.,, & and '/.(9 k* a (.7(7 & c. 1'.'' k* a (.,, & and ''.4'9 k* a (.7(7 & d. 1'.'' k* a (." & and ''.4' a uni2 & =eedback 8!e correc ans%er is< 11."4 k* a (." & and '/.(9 k* a uni2 & Queston /7 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex An ac generaor 1"(( kA caaci2 !as a &ull load e3cienc2 o& 91$ a 1(($ o%er &acor and ,$ e3cienc2 a ($ o%er &acor lagging. *!a engine dri)e in 6 is reuired i& !e gense is o sul2 entrel2 incandescen lam+ 5elec one< a. /1'" b. ''1( c. 19( d. '"'" =eedback 8!e correc ans%er is< ''1( Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A suirrel cage inducton moor %i! namelae daa o& 1"( 6:# /0!ase# 4,( # ,( 6# ,0ole# (." .&. %as sub;eced o cerain er&ormance ess. 8!e es resul readings %ere as &ollo%s< =ull0load curren > '(' A# =ull0load orue > ,7,. lb0?# 5ol)e &or !e ercenage sli. 5elec one< a. 4.1"$ b. /.'$ c. '.'"$ d. /.("$ =eedback 8!e correc ans%er is< /.'$ Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e inu curren o a ''( # s!or s!un comound moor a no0load is , A. 8!e s!un Ield circui resisance is ''( o!ms# !e armaure resisance is (.1( o!m and !e series Ield resisance is (.( o!m. *!a is !e sra2 o%er loss+ 5elec one< a. 1'/'."4 * b. 11"/./1 * c. 1(7/.'" * d. 1(,,.'' * =eedback 8!e correc ans%er is< 1(7/.'" * Queston 4( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure o& a 40ole# 1' slos s!un generaor is la %ound %i! &our conducors er slo. 8!e Tux er ole is "( m*b. 8!e armaure and s!un Ield resisances are (.(4 o!m and "( o!ms resect)el2. -eermine !e seed o& !e mac!ine %!en sul2ing 4(( A a a erminal )olage o& '"( . 5elec one< a. ,'4 rm b. ,''rm c . ,/4 rm d. ,1" rm =eedback 8!e correc ans%er is< ,'4 rm Queston 41 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A -C s!un moor runs a ,(( rm on a '4(0)ol sul2 %!ile dra%ing a line curren o& /( A. Hs armaure and Ield resisances are (." o!m and 1'( o!ms resect)el2. *!a resisance s!ould be laced in series %i! !e armaure circui in order o reduce !e seed o 4(( rm. Assume no c!anges in !e armaure or Ield cur ren. 5elec one< a. '.41 o!ms b. '.,9 o!ms c. './ o!ms d. '.(7 o!ms =eedback 8!e correc ans%er is< '.,9 o!ms Queston 4' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A long s!un comound generaor deli)ers 1(( A# '"( a raed load. 8!e resisances o& !e )arious %indings are< armaure > (.1 o!m# inerole > (.(' o!m# s!un Ield > 1(( o!ms and series Ield > (.('" o!m. H& !e sra2 o%er losses amoun o 1. k*# sol)e &or !e o)erall e3cienc2 o& !e generaor. 5elec one< a. ./'$ b. 9(."'$ c. 7.4/$ d. ,./,$ =eedback 8!e correc ans%er is< ,./,$ Queston 4/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A o%er rans&ormer raed "(#((( kA# /4." kK1/. k is conneced %2e0 %2e. *!a are !e line currens a &ull load+ 5elec one< a. 4/.1 A# 1'(7.7 A b. "'"." A# 17'".4 A c. /,.7 A# '(9' A d. 1449./ A# /,'/.' A =eedback 8!e correc ans%er is< /,.7 A# '(9' A Queston 44 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A rans&ormer %!en sul2ing a load mainained 11 k across erminals. *!en !e load %as s%ic!ed o# !e erminal )olage became 11""( . *!a is !e )olage regulaton o& !e load+ 5elec one< a. ""$ b. "."$ c. 11.""$ d. "$ =eedback 8!e correc ans%er is< "$ Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex =ind !e )olage regulaton o%er sul2 %i! 4(( %i!ou load and '(( %i! &ull load. 5elec one< a. 1(($ b. "$ c. "($ d. 1($ =eedback 8!e correc ans%er is< 1(($ Queston 4, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "0!# !ree0!ase# 4((0 sar0conneced suirrel0cage inducton moor mean
o dri)e a milling mac!ine# a sartng akes abou 5elec one< a. 1"( A b. '(( A c. 4( A d. 1(( A =eedback 8!e correc ans%er is< 4( A Queston 47 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a " 6# '/( ol# 1"(( rm s!un moor# !e resisance o& !e armaure including brus!es is (.17" o!m and !a o& !e s!un Ield is ,1( o!ms. 8!e sra2 o%er losses %!en !e moor deli)ers raed load a raed )olage is /(" %a@s. 8!e e3cienc2 a raed load is neares o 5elec one< a. 9$ b. 9($ c. 9$ d. "$ =eedback 8!e correc ans%er is< 9$ Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase s2nc!ronous moor is measured b2 %o %a@meers A and B. *a@meer A reads '., k* and %a@meer B reads 4,." k*. 8!e inu o%er o& !e moor is under excied and assumed consan. *!a are !e readings o& %a@meers A and B i& !e o%er &acor is "$ and !e moor is o)er0excied+ 5elec one< a. 4'." k*# /'., k* b. "1 k*# '4. 1 k* c. 4., k*# ',." k* d. "'., k*# ''." k* =eedback 8!e correc ans%er is< "1 k*# '4. 1 k* Queston 49 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!m er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. Calculae !e maximum o%er !a can be de)eloed b2 !e alernaor a !is exciaton. 5elec one< a. 11 M* b. 9. M* c. 1' M* d. 1( M* =eedback 8!e correc ans%er is< 11 M* Queston "( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(06:# ""( )ols# ,( 6# /0!ase inducton moor !as a sartng orue o& 1,($ o& &ull0load orue and sartng curren o& 4'"$ o& &ull0 load curren. *!a %ill be !e )olage in order !a !e sartng curren be limied o !e &ull0load )alue+ 5elec one< a. 1'"."' b. 1'9.41 c. 1/'.47 d. 1/,.7" =eedback 8!e correc ans%er is< 1'9.41 Queston 1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e )olage alied o !e !.). side o& a rans&ormer during s!or0circui es is '$ o& is raed )olage. 8!e core loss %ill be ercen o& !e raed core loss. 5elec one< a. (.'" b. (.4 c. 4 d. (.(4 =eedback 8!e correc ans%er is< (.(4 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An oen dela bank# consistng o& %o0single !ase rans&ormers is oeratng %i! balanced !ree0!ase load o& "( kA# 44( a (. & lagging and a single !ase load o& 1( k* resist)e conneced across c0a leg. -eermine !e minimum ratngs o& !e rans&ormers. Assume a !ase seuence o& a0b0c. 5 elec one< a. /".4 kA# /,./4 kA b. /(./ kA# /9."' kA c. /.( kA# /4.(, kA d. /4./' kA# //.4( kA =eedback 8!e correc ans%er is< /.( kA# /4.(, kA Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc resisance es is conduced on a /0!ase '(( kA# '4( )ols# dela conneced generaor. *!en !e %o erminals are conneced &rom , )ols dc source# !e ammeer insered in !e lines reads 1"( ameres. 8!e eect)e resisance o o!mic resisance is 1.'". *!a is !e ercen resisance+ 5elec one< a. 4."$ b. ,$ c. 7."$ d. ,.9$ =eedback 8!e correc ans%er is< ,$ Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '( k*# '(( s!un generaor is oeraed a raed load. H& !e dri)ing engine is de)eloing /( 6:# deermine !e iron and &ricton losses. Armaure resisance is (.(" o!m and Ield resisance is "( o!ms. 5elec one< a. 1(/9 * b. 9"4 * c. 1/4( * d. 9/4 * =eedback 8!e correc ans%er is< 1(/9 * Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An oen dela# !ree0 !ase rans&ormer consistng o& %o single0!ase rans&ormers is oeratng %i! a balanced !ree0!ase load o& "( kA# 44(0 a a lagging & o& (.. -eermine !e oeratng & o& eac! rans&ormer. 5elec one< a. (./9/ lagging# (.99/ lagging b. (.// lagging# (.7 lagging c. (./9/ lagging# (.7 lagging d. (.// lagging# (.99/ lagging =eedback 8!e correc ans%er is< (./9/ lagging# (.99/ lagging Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "( 6:# ""( s!un0%ound moor dra%s a line curren o& 4." A a no0load. 8!e s!un Ield resisance is '7" o!ms and !e armaure resisance exclusi)e o& !e brus!es is (./ o!m# !e brus! dro a &ull0load is ' . A &ull0load# !e moor dra%s a line curren o& 4 A. Calculae !e e3cienc2 a &ull0load. 5elec one< a. 91.'$ b. ."$ c. 9.9$ d. 9'.($ =eedback 8!e correc ans%er is< 9.9$ Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A suirrel cage inducton moor %i! namelae daa o& 1"( 6:# /0!ase# 4,( # ,( 6# ,0ole# (." .&. %as sub;eced o cerain er&ormance ess. 8!e es resul readings %ere as &ollo%s< =ull0load curren > '(' A# =ull0load orue > ,7,. lb0?# 5ol)e &or !e ercenage sli. 5elec one< a. /.("$ b. /.'$ c. '.'"$ d.
4.1"$ =eedback 8!e correc ans%er is< /.'$ Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# !e iron loss o& !e rans&ormer a raed )olage bu "( 6 %ould be %a@. 5elec one< a. ,4( b. ( c. 1.'" d. 1(( =eedback 8!e correc ans%er is< ,4( Queston 9 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a 4 ole# /" slo d.c. armaure# calculae !e coil san. 5elec one< a. 9 slos b. 7 slos c. slos d. 1(slos =eedback 8!e correc ans%er is< slos Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& a !2brid seer moor !as a roor ic! o& /, degrees and a se angle o& 9 degres# !e number o& is !ases mus be 5elec one< a. , b. 4 c. / d. ' =eedback 8!e correc ans%er is< 4 Queston 11 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase inducton moor is running a '$ sli. H& !e inu o roor is 1((( *# !en mec!anical o%er de)eloed b2 !e moor is 5elec one< a. 9( * b. '(( * c. '( * d. "(( * =eedback 8!e correc ans%er is< 9( * Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A raed load# a s!un moor dra%s an armaure curren o& "( A &rom a '/( dc mains %!ile running a 1((( rm. A no0load !e armaure curren dros o " A. H& !e eec o& armaure reacton !as %eaken !e Tux b2 '$ &rom no0load o &ull0load# deermine seed o& !e moor a no0load. Assume !e armaure resisance o be (.1" o!m. 5elec one< a. 1(1( rm b. 1''1 rm c . 11'' rm d. 1'(' rm =eedback 8!e correc ans%er is< 1(1( rm Queston 1/ Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A resisor assembl2 &or a %ound roor consiss o& '( elemens o& cas iron grid elemens. 8!e ratng o& eac! is (.1( o!m. *!en ;oined in series and esed across ''( )ols# !e measured curren %as 1(( A. 6o% muc! o%er %as los in !e ;oins+ 5elec one< a. '.1 k* b. '.( k* c . 1.9 k* d. 1. k* =eedback 8!e correc ans%er is< '.( k* Queston 14 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(0 ole# 4((0k*# '"(0 dc generaor !as a la0%ound armaure %i! 7" slos eac! !a)ing 1' conducors. 8!e secton o& eac! conducor is ' x 17." mmf'. H& !e a)erage leng! o& one urn is 1"( cm# Ind !e resisance o& !e armaure. Assume !e seciIc resisance er coer as ' micro0o!m0cm. 5elec one< a. (.((9,4/ o!m b. (.(('"71 o!m c. (.((/"7 o!m d. (.((7714 o!m =eedback 8!e correc ans%er is< (.((/"7 o!m Queston 1" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A single !ase generaor %i! &ull load curren o& 4"( ameres a '4(( )ols !as (.( o!m resisance and s2nc!ronous reacance is '. o!ms. -eermine !e )olage regulaton in ercen a 7"$ o%er &acor lagging. 5elec one< a. ,4 b. 7" c. "" d. 41 =eedback 8!e correc ans%er is< 41 Queston 1, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A d.c. moor de)elos a orue o& '(( 0m a '" rs. A '( rs# i %ill de)elo a orue o& 0m. 5elec one< a. '"( b. 1' c. 1,( d. '(( =eedback 8!e correc ans%er is< '(( Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o s!un generaors A and B# %i! ratngs o& 1"( k* and 1(( k* resect)el2 !a)ing identcal sraig!line )olage )s. ercen k* ouu c!araceristc# are conneced in arallel. 8!e no0load and &ull0load )olage o& '"" and '/( )ols# calculae !e k* ouu o& eac! %!en !e oal load s!ared is '(( k*. 5elec one< a. 11( k* am 9( k* b. 1'" k* am 7" k* c. 1"( k* am "( k* d. 1'( k* am ( k* =eedback 8!e correc ans%er is< 1'( k* am ( k* Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase %ound roor inducton moor# 44( # ,( c2cles# 4 oles is conneced o a um !a deli)ers 1((( c&m o& %aer agains an eect)e !ead o& ?. Fnder !is load# !e moor dra%s 1" k* a a o%er &acor o& (.9(. *!en oeraed %i!ou load# !e moor dra%s (( %a@s. 8!e saor resisance er !ase is (.'1 o!m and !e roor resisance er !ase is (.('' o!m. 8!e urns rato be%een saor and roor is 4 1.1'# Roor resisance > (.1(# 5aor resisance > (.'"# Connecton > 0. 8!is moor is "(( 6:# /0!ase# ''(( )ol# ,(0c2cle# ,0 ole inducton moor %i! additonal core loss o& '#((( %a@s and !e &ricton and %indage losses oal is 1(#((( %a@s. 5elec one< a. 119, rm b. 119( rm c. 1'(( rm d. 11 rm =eedback 8!e correc ans%er is< 119( rm Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(06:# ""( )ols# ,( 6# /0!ase inducton moor !as a sartng orue o& 1,($ o& &ull0load orue and sartng curren o& 4'"$ o& &ull0load curren. H& !e moor is used on a 44( )ol# ,( 6 s2sem# %!a %ill be !e sartng orue exressed in ercen o& &ull0load )alue+ 5elec one< a. 1(1.$ b. 1(/."$ c. 1('.4$ d. 1(4.'$ =eedback 8!e correc ans%er is< 1('.4$ Queston 19 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o searael2 excied dc s!un generaors are conneced in arallel and carr2 a oal load curren o& "(( ameres. eneraor A !as an armaure resisance o& (.(/ o!m and is generatng a )olage o& '/( )ols. eneraor B !as an armaure resisance o& (.(4 o!m and is generatng a )olage o& '/( )ols also. Calculae !e erminal )olage. 5elec one< a. '/( )ols b. ''1.44 )ols c. '1".", )ols d. '1(."( )ols =eedback 8!e correc ans%er is< ''1.44 )ols Queston '( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '(0k* ''(0)ols s!un generaor !as an armaure resisance o& (.(7 o!m and a s!un resisance o& '(( o!ms. -eermine !e o%er de)eloed in !e armaure %!en i deli)ers is raed ouu. 5elec one< a. '(./ k* b. '".7 k* c. '7.9 k* d. 19.' k* =eedback 8!e correc ans%er is< '(./ k* Queston '1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure o& a moor !as o& 4(( act)e conducors# !e Tux densi2 in !e Ield being /((( gauss. 8!e axial leng! o& !e armaure is '(./' cm. 8!e curren is /( ameres. -eermine !e oal &orce exered in !e armaure.
5elec one< a. 4/9.' b. ,4".9 c . (.(7 d. 7/1." =eedback 8!e correc ans%er is< 7/1." Queston '' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A simlex la %ound armaure !as "( conducors and carries a curren o& 1'" amere er armaure curren a!. H& !e Tux er ole is '( m*b# calculae !e elecromagnetc orue de)eloed b2 !e armaure. 5elec one< a. '/(.77 0m b. '"'.7' 0m c. '(7.,/ 0m d. '1(.,4 0m =eedback 8!e correc ans%er is< '/(.77 0m Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc generaor !as a mec!anical e3cienc2 a 9.'$ and an elecrical e3cienc2 o& 9".9$. =ind !e commercial e3cienc2. 5elec one< a. 9$ b. 94.'$ c. 9,."$ d. 97.4$ =eedback 8!e correc ans%er is< 94.'$ Queston '4 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex =ind !e &reuenc2 in kiloc2les er second in !e armaure o& a 1( ole# 1#'(( rm generaor. 5elec one< a. 1((.( b. 1(((.( c. 1(.(( d. (.1(( =eedback 8!e correc ans%er is< (.1(( Queston '" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 40ole# 1'0slo la %ound d.c. armaure !as ' coil sidesKslo. Assuming single urn coils and rogressi)e %inding# !e back ic! %ould be 5elec one< a. / b. , c. " d. 7 =eedback 8!e correc ans%er is< 7 Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(0kA# '#4((K'4( single0!ase rans&ormer !as !e &ollo%ing resisances and leakage reacances. =ind !e rimar2 )olage reuired o roduce '4(0 a !e secondar2 erminals a &ull0load %!en !e load o%er &acor is (. lagging. r1 > / o!ms# x1 > 1" o!ms# r' > (.(/ o!m# x' > (.1" o!m 5elec one< a. '#4"( )ols b. '#,/' )ols c. '#49, )ols d. '#"7" )ols =eedback 8!e correc ans%er is< '#49, )ols Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A s!or circui es %as er&ormed uon a 1(0kA# '/((K'/( )ol rans&ormer %i! !e &ollo%ing resuls< Esc > 1/7 )ols :sc > 19' * Hsc > 4./4 A. Calculae in rimar2 erms !e reacance o& !e rans&ormer. 5elec one< a. '9. o!ms b. 1'.4" o!ms c. /1.", o!ms d. 1 (.19 o!ms =eedback 8!e correc ans%er is< '9. o!ms Queston ' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a 1(0ole# la0 %ound d.c. generaor# !e number o& act)e armaure conducors ole is "(. 8!e number o& comensatng conducors er ole reuired is 5elec one< a. "(( b. " c. 1( d. "( =eedback 8!e correc ans%er is< " Queston '9 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4#4(( )ol# ,( 6 rans&ormer !as a core loss o& 4( *a@s# o& %!ic! one0!ird is edd20curren loss. -eermine !e core loss o& !is rans&ormer %!en i is conneced o a 4#,(( ols# "( 6. 5elec one< a. 779 *a@s b. 977 *a@s c. ,79 *a@s d. 79 *a@s =eedback 8!e correc ans%er is< 977 *a@s Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e number o& c2cles generaed in a ,0ole alernaor in one re)oluton is 5elec one< a. , b. "( c. / d. none o& !ese =eedback 8!e correc ans%er is< / Queston /1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A d.c. s!un moor de)elos 7. ! a 1'( )ol# !e armaure e3cienc2 is 9/$. *!a is !e armaure eect)e resisance+ 5elec one< a. (.(, o!m b. (.(" o!m c. (.1, o!m d. (.1 o!m =eedback 8!e correc ans%er is< (.1, o!m Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Calculae !e oal magnetc Tux in a ,(0c2cle rans&ormer in %!ic! !e induced em& er urn o& !e %inding is eual o ' . 5elec one< a. 7.4' m*b b. 7."( m*b c. 7.(' m*b d. 7."( m*b =eedback 8!e correc ans%er is< 7."( m*b Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An ( k*# 44( )ols# /0!ase# 0conneced# ,( 6# 40 ole s2nc!ronous moor !as a s2nc!ronous reacance o& /0o!m er !ase. Calculae !e orue in e%on0meer i& i is oeratng a raed conditon a 9'$ e3cienc2. 5elec one< a. 714 b. 4,1 c. 1/" d. "71 =eedback 8!e correc ans%er is< 4,1 Queston /4 Correc Mark 1.(( ou o& 1 .(( =lag ueston Queston ex 8!e inu and ouu o%ers o& a ''( # s!un moor are /( and ' k* resect)el2. 8!e Ield and armaure circui resisances are 4( o!ms and (.(1'" o!m resect)el2. -eermine !e e3cienc2 o& !e moor i& !e ouu o%er is reduced o 1( k*. 5elec one< a. 4.9/$ b. .,7$ c. ,.4$ d. /.",$ =eedback 8!e correc ans%er is< 4.9/$ Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,9K1/. k# 1( MA !ree0!ase rans&ormer is conneced %2e0grounded dela. *!a is !e k ratng o& !e secondar2 %inding+ 5elec one< a. '/.9 b. 7.97 c. 1/. d. 1" =eedback 8!e correc ans%er is< 1/. Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase AC generaor is sul2ing o%er o a load o& /'(( k* a '/( )ols and a o%er &acor o& ,($. Assume !a
!e loss o& !e line# !e generaor armaure and !e load is eual o !e 1($ o& !e load# %!a %ould be !e sa)ings in %a@s i& !e o%er &acor %ere raised o ($+ 5elec one< a. '/(#((( b. (#((( c. 1((#((( d. 14(#((( =eedback 8!e correc ans%er is< 14(#((( Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a !ree !ase s2nc!ronous con)erer# !e rato o& !e AC )olage o -C )olage is 5elec one< a. (.,1' b. 1.( c. ( ."( d. (.7(7 =eedback 8!e correc ans%er is< (.,1' Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o single0!ase disributon rans&ormers are banked in 0 oen delaP. H& eac! rans&ormer is raed /7." kA# sol)e &or !e maximum /0!ase load !a !e bank can carr2 %i!ou o)erloading# considering !a !e load !as a o%er &acor o& (." lagging. 5elec one< a. "".' k* b. 49." k* c. "'." k* d. "/., k* =eedback 8!e correc ans%er is< "".' k* Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '"(( kA# ,,(( s2nc!ronous urbo alernaor is oeratng a &ull load and (. & lagging. 8!is mac!ine !as a s2nc!ronous reacance er !ase o& 1(.4 o!ms and negligible resisance. Calculae !e ercenage )olage regulaton. 5elec one< a. 4.",$ b. 4/.9,$ c. 4'./"$ d. 4".4$ =eedback 8!e correc ans%er is< 4/.9,$ Queston 4( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4((0k*# ,(( )ol# d0c s!un generaor !as an armaure resisance o& (.(/ o!m. 8!e Ield resisance is 4 o!ms. 8!e sra2 o%er loss &or !is mac!ine a raed )olage and seed is 7'(( %a@s. *!a is !e maximum e3cienc2+ 5elec one< a. 9"./$ b. 9/.4$ c. 9."$ d. 9,./$ =eedback 8!e correc ans%er is< 9/.4$ Queston 41 Correc Mark 1.(( ou o& 1 .(( =lag ueston Queston ex 8%o single !ase rans&ormers %i! eual ratngs and urns rato are oeraed in arallel o sul2 a load o& 1( k* a a lagging & o& (.9(. 8rans&ormer A !as a resisance o& 1$ and a reacance o& ,$. 8rans&ormer B !as a resisance o& '$ and a reacance o& "$. Calculae !e o%er deli)ered b2 eac! rans&ormer. 5elec one< a. k*# 9' k* b. ( k*# 1(( k* c. 79 k*# 9' k* d. / k*# 97 k* =eedback 8!e correc ans%er is< ( k*# 1(( k* Queston 4' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Calculae !e &orce !a %ill be exered on !e scale in a on2 brake es %!en a '(0!# 1#4(( rm moor is oeratng a &ull load. 8!e leng! o& !e brake arm is / ? and !e are %eig! o& !e brake is /.7" lbs. 5elec one< a. '1."4 lbs b. /(.4" lbs c. /,.// lbs d. '.7, lbs =eedback 8!e correc ans%er is< '.7, lbs Queston 4/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A iece o& conducor 1( cm long mo)es across a magnetc Ield o& 1(#((( gauss a a )eloci2 o& 1'( cmKsec. *!a )olage aears across !e conducor+ 5elec one< a. 1'( b. (.'4 c. ,( d. (.1' =eedback 8!e correc ans%er is< (.1' Queston 44 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "(( k*# ,((0 -C# 1'0!ase s2nc!ronous con)erer oeraes as a direc con)erer a a &ull load e3cienc2 o& 9'$ and a o%er &acor o& (.9/. Calculae !e AC )olage be%een sli rings and !e AC curren dra%n &rom a 1'0!ase rans&ormer &ed sul2. 5elec one< a. 11( # ''9 A b. 11' # '1" A c. 11( # '1" A d. 11' # ''9 A =eedback 8!e correc ans%er is< 11( # ''9 A Queston 4" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A &our0ole# !ree0!ase# "(06 sar conneced AC generaor !as '4 saor slos. 8!ere are , conducors er slo and a sinusoidall2 disribued Tux er ole o& ," m*b. =ind !e erminal )olage on oen circui# i& !e coil san &acor is uni2. 5elec one< a. "79.44 b. "4,.(" c. ",.4 d. "".,' =eedback 8!e correc ans%er is< "79.44 Queston 4, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase inducton moor is raed "( !# ''( )ols and 174" rm and 7$ o%er &acor. *!a is !e ercen sli+ 5elec one< a. 4.($ b. /."$ c. '."$ d. /.1$ =eedback 8!e correc ans%er is< /.1$ Queston 47 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e curren dra%n b2 a 1'(0 d.c. moor o& armaure resisance (." o!m and back e.m.&. 11( is amere. 5elec one< a. '4( b. '( c. " d. ''( =eedback 8!e correc ans%er is< '( Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A ,0ole# "(06# /0!ase inducton moor is running a 9"( rm and !as roor Cu loss o& " k*. Hs roor inu is k*. 5elec one< a. 9" b. 1( c. 1(( d. "./ =eedback 8!e correc ans%er is< 1(( Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a " 6# '/( ol# 1"(( rm s!un moor# !e resisance o& !e armaure including brus!es is (.17" o!m and !a o& !e s!un Ield is ,1( o!ms. 8!e sra2 o%er losses %!en !e moor deli)ers raed load a raed )olage is /(" %a@s. 8!e e3cienc2 a raed load is neares o 5elec one< a. 9$ b. 9($ c. 9$ d. "$
=eedback 8!e correc ans%er is< 9$ Queston "( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "((( kA# /0!ase# 1( k# "( 6 alernaor runs a 1"(( rm conneced o consan &reuenc2# consan )olage busbars. H& !e momen o& inerta o& entre roatng s2sem is 1." x 1(f4 kg0mf' and !e sead2 s!or circui curren is " tmes !e normal &ull load curren. Calculae !e naural tme eriod o& oscillaton. 5elec one< a. 1." sec b. 1.4 sec c. 1.' sec d. 1./ sec =eedback 8!e correc ans%er is< 1.4 sec E 8!e Ield curren o& a 1(( k*# '"(0)ol s!un generaor is " ameres %!en deli)ering o%er a raed erminal )olage and raed load curren. 8!e combined armaure and brus! resisance is (.(1 o!m. -eermine !e e3cienc2 o& !e generaor. 5elec one< a. 94./$ b. 9.'$ c. 94.7$ d. 97.'$ =eedback 8!e correc ans%er is< 97.'$ Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /#/((K'/( # "( kA# single !ase rans&ormer is &ound o !a)e imedance o& 4$ and a coer loss o& 1.$ a &ull load. *!a is !e ercen reacance+ 5elec one< a. /./$ b. /."7$ c. /.79$ d. /.74$ =eedback 8!e correc ans%er is< /."7$ Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( )ols. 8!e armaure resisance is (.(,1 o!m. *!a is !e armaure curren+ 5elec one< a. 9".1 Ameres b. 9,.1" Ameres c. 9.1" Ameres d. 91." Ameres =eedback 8!e correc ans%er is< 9.1" Ameres Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A , ole la %ound s!un moor akes /(( A %!en !e seed is "(( rm. 8!e Tux er ole is (.(, *b and !e armaure !as a 7( conducors. eglectng !e s!un Ield curren# calculae !e ouu !orseo%er o& !e moor. Assume a consan loss o& 4$. 5elec one< a. 17" ! b. 17' ! c. 1," ! d. 1, ! =eedback 8!e correc ans%er is< 1, ! Queston " Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Eac! o& !e series0Ield coils o& a 40ole "(0k*# '"(0)ol s!or s!un comound generaor !as , 1K' urns o& %ire. 8!e resisance o& !e entre series Ield is (.(1' o!m and !e di)erer resisance is (.(/, o!m. *!a is !e number o& amere0urns o& eac! ser ies0Ield coil a &ull0load+ 5elec one< a. 1/(( A8 b. 97" A8 c. ''7" A8 d. /'" A8 =eedback 8!e correc ans%er is< 1/(( A8 Queston , Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4 ole dc generaor %i! simlex la %inding !as 4 slos and &our elemens er slo. 8!e Tux er ole is '." x 1(f, max%ells and i runs a 1"(( rm. *!a is !e ouu )olage+ 5elec one< a. ''" )ols b. 1'( )ols c. ,( )ols d. /,( )ols =eedback 8!e correc ans%er is< 1'( )ols Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''( s!un moor de)elos a orue o& "4 0m a armaure curren o& 1( A. 8!e orue roduced %!en !e armaure curren is '( A# is 5elec one< a. 1( 0m b. 1 0m c. "4 0m d. none o& !e abo)e =eedback 8!e correc ans%er is< 1( 0m Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4((0# "(06 !ree0!ase inducton moor roaes a 144( rm on &ull0load. 8!e moor is %ound &or 5elec one< a. 0oles b. '0oles c. ,0oles d. 40oles =eedback 8!e correc ans%er is< 40oles Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A s!un moor# %!ic! !as a Ield resisance o& ''( o!ms and an armaure resisance o& (. o!m akes ', A &rom a ',( sul2 %!en running a "(( rm on &ull load. Hn order o conrol !e seed o& !e moor a 1.'0o!m resisor is conneced in series %i! !e armaure. Calculae !e seed a %!ic! !e moor %ill run %!en sul2ing &ull load orue. 5elec one< a. 47' rm b. 4/ rm c. 44" rm d. 4'4 rm =eedback 8!e correc ans%er is< 4/ rm Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e roor o& a ''( # ,( 6# 4 ole inducton moor !as a o%er inu o& ( k* is obser)ed !a !e roor em& makes 9( c2cles er minue. Calculae !e mec!anical o%er de)eloed. 5elec one< a. 77 k* b. 7' k* c. 7" k* d. 7 k* =eedback 8!e correc ans%er is< 7 k* Queston 11 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor deli)ers 19" A a a erminal )olage o& '"( . 8!e armaure resisance and !e s!un Ield resisance are (.(' and (.(" o!m resect)el2. 8!e iron and !e &ricton losses are eual o 9"( *. =ind !e mec!anical e3cienc2. 5elec one< a. 9/."$ b. 9".9$ c. 9.'$ d. 97./"$ =eedback 8!e correc ans%er is< 9.'$ Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "( kA# '/((K'/( )ols# ,( c2cle rans&ormer is esed in !e laboraor2 so !a is c!araceristcs ma2be deermined. 8!e sandard es reuires an oen circui es and s!or circui es. Oen Circui 8es< H > ,." A# E > '/( # : > 17 * 5!or Circui 8es< H > '1.7 A# E > 11" # : > "7( *.
-eermine !e e3cienc2 o& !e rans&ormer a !al& load# uni2 &. 5elec one< a. 9.4"$ b. 97.""$ c. 97.($ d. 9.7($ =eedback 8!e correc ans%er is< 9.7($ Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1((0kA# 11((K44(0# "(06 single0!ase rans&ormer !as 1(( urns on !e secondar2 %inding. 8!e number o& urns in !e rimar2 %ill be 5elec one< a. ""(( b. '7"( c. ""( d. '7" =eedback 8!e correc ans%er is< '7" Queston 14 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex =ind !e &reuenc2 in kiloc2les er second in !e armaure o& a 1( ole# 1#'(( rm generaor. 5elec one< a. 1(((.( b. (.1(( c. 1(.(( d. 1((.( =eedback 8!e correc ans%er is< (.1(( Queston 1" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dela0conneced load inducton moor dra%s 1(( A &rom eac! line o& a !ree0!ase source and de)elos 4( lb0? orue a sandstll. =ind !e orue %!en conneced o !e same source i& !e moor is reconneced in %2e. 5elec one< a. none o& !ese b. 1/./ lb0 ? c. 4( lb0? d. 1'( lb0? =eedback 8!e correc ans%er is< 1/./ lb0? Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '" kA# ''( )ol !ree !ase alernaor deli)ers raed kA a (.4 o%er &acor. 8!e eect)e ac resisance be%een !e armaure %inding erminals is (.1 o!m. 8!e Ield akes 9./ ameres a 11" )ols. H& !e &ricton and %indage loss is 4,( %a@s and !e core loss is ,1( %a@s. *!a is !e 6: deli)ered b2 !e rime mo)er+ 5elec one< a. '.1" b. /1."4 c. /'., d. //.'/ =eedback 8!e correc ans%er is< /'., Queston 17 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /( 6:# 4 oles# /0!ase# '/( )ols# ,( 6 suirrel cage inducton moor oeratng a 9($ e3cienc2# "$ o%er &acor and '."$ sli dri)es a %aer um &or a reser)oir. =ind !e curren and seed a %!ic! !e moor is oeratng. 5elec one< a. ,'.4 A# 17"" rm b. ,'.4 A# 1(( rm c. 7/.4 A# 17"" rm d. 7/.4 A# 1(( rm =eedback 8!e correc ans%er is< 7/.4 A# 17"" rm Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,0ole# /0!ase# ,( c2cle alernaor !as 1' slos er ole and &our conducors er slo. 8!e %inding is "K, ic!. 8!ere are '#"((#((( Max%ells enering !e armaure &rom eac! or! :ole# and !is Tux is sinusoidall2 disribued along !e air ga. 8!e armaure coils are all0 conneced in series. 8!e %inding is %2e0conneced. -eermine !e oen circui em& o& !e alernaor. 5elec one< a. "1'.4 b. "(4.' c. "7'.4 d. "/'.1 =eedback 8!e correc ans%er is< "1'.4 Queston 19 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A raed load# a s!un moor dra%s an armaure curren o& "( A &rom a '/( dc mains %!ile running a 1((( rm. A no0load !e armaure curren dros o " A. H& !e eec o& armaure reacton !as %eaken !e Tux b2 '$ &rom no0load o &ull0 load# deermine seed o& !e moor a no0load. Assume !e armaure resisance o be (.1" o!m. 5elec one< a. 1'(' rm b. 1''1 rm c. 1 1'' rm d. 1(1( rm =eedback 8!e correc ans%er is< 1(1( rm Queston '( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1'(K1( )ol auo0 rans&ormer dra%s o%er a 1'( ol and sulies o%er o a ' k* load a 1( ols %i! a .&. o& (.( lagging. An additonal load o& 1 k* is sulied a uni2 .&. &rom !e ,( ol *inding. *!a is !e cur ren dra%n &rom !e 1'( ol sul2 line+ 5elec one< a. ' b. /( c. ', d. /' =eedback 8!e correc ans%er is< ' Queston '1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4 ole# "( 6 single0!ase inducton moor !as a sli o& "$. 8!e seed o& !e moor %ill be 5elec one< a. none o& !ese b. 1'(( rm c. 14'" rm d. 1"(( rm =eedback 8!e correc ans%er is< 14'" rm Queston '' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A -C s!un moor !as a &ull load ratng o& 1" !# '/( )ols# "7.1 ameres# 14(( rm. 8!e armaure circui resisance is (.1/ o!m and !e Ield circui resisance is 11" o!ms. eglectng !e eec o& armaure reacton# deermine !e no0load seed. 5elec one< a. 1/9' rm b. 1',4 rm c. 1441 rm d. 1/( rm =eedback 8!e correc ans%er is< 1441 rm Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex *!a is !e rato o& caaci2 o& oen dela bank o !e caaci2 o& close dela bank+ 5elec one< a. ,/.'$ b. ,,.7$ c. "7."$ d. 7'$ =eedback 8!e correc ans%er is< "7."$ Queston '4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A s!un moor dra%s curren o& 4( A &rom a 1'( source and runs a 1'(( rm a raed load. 8!e armaure and Ield circui resisances are (.1 o!m and ,( o!ms# resect)el2. -eermine !e seed o& !e moor a !al& load. Assume a brus! dro o& ' raed load and 1 !al& load. 5elec one< a. 1'/( rm b. 1(', rm c. 1'/ rm d. 11( rm =eedback 8!e correc ans%er is< 1'/( rm Queston '" Correc Mark 1.(( ou o& 1.((
=lag ueston Queston ex A !ree0!ase# ,0ole# 7'0slo armaure o& a s2nc!ronous generaor is %ound using a %o la2er la coil !a)ing '( conducors er coil %i! a ic! o& /.//$. 8!e Tux er ole is 4#((#((( Max%ells. H& !e roor o& !e generaor is dri)en a a seed o& 1'(( rm# calculae !e induced em& er !ase. oe< 8!ere are ' coils in 1 slo. 5elec one< a. "#,( b. "#/9( c. "#",4 d. "#"4 =eedback 8!e correc ans%er is< "#,( Queston ', Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A searael2 excied generaor generaes '/( )ols %!en dri)en a 1'(( rm. H& !e Tux is decrease b2 1($# %!a is !e ne% em& %i! seed remains !e same+ 5e lec one< a. '"/ )ols b. '/( )ols c. '(7 )ols d. '", )ols =eedback 8!e correc ans%er is< '(7 )ols Queston '7 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex *!en a closed0dela bank is con)ered ino an oen0dela bank eac! o& !e %o remaining rans&ormer sulies ercen o& !e original load. 5elec one< a. "7.7 b. "( c. 7/.' d. ,,.7 =eedback 8!e correc ans%er is< "7.7 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(0kA# '(((K4(( # single0!ase rans&ormer !as rimar2 and secondar2 %inding imedances o& ".( G ;1( and (.' G ;(.4" o!ms# resect)el2. Calculae !e )olage across !e secondar2 erminals a &ull load# ($ o%er acor lagging# %!en !e rimar2 is sulied %i! '#((( )ols. 5elec one< a. /79 b. /" c. /94 d. 4(( =eedback 8!e correc ans%er is< /79 Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '#"(( kA# !ree0!ase# ,(06# ,., k %2e0 conneced alernaor !as a Ield resisance o& (.4" o!m and an armaure resisance o& (.(" o!m er !ase. 8!e Ield curren a &ull load (." o%er &acor is '(( A. 8!e sra2 o%er losses amoun o ' k*. Calculae !e e3cienc2 o& !e alernaor a &ull0load# (." o%er &acor lagging. 5elec one< a. 9".'$ b. 9/.7$ c. 94.$ d. 9,./$ =eedback 8!e correc ans%er is< 9".'$ Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1((0)ol s!un moor is de)eloing , ! %!ile oeratng a an o)er0all e3cienc2 o& ,$. 8!e armaure and s!un Ield resisances are (.(, and "( o!ms resect)el2. -eermine !e sra2 o%er losses. 5elec one< a. /,4 * b. /9' * c. /,7 * d. /7 * =eedback 8!e correc ans%er is< /7 * Queston /1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e seed o& a moor0generaor se consistng o& a ,0ole inducton moor and a 40ole dc generaor &ed &rom a /0!ase. 5elec one< a. 1((( b. 1"(( c. , (( d. /((( =eedback 8!e correc ans%er is< ,(( Queston /' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(06:# ""( )ols# ,( 6# /0!ase inducton moor !as a sartng orue o& 1,($ o& &ull0load orue and sartng curren o& 4'"$ o& &ull0 load curren. *!a %ill be !e )olage in order !a !e sartng curren be limied o !e &ull0load )alue+ 5elec one< a. 1/'.47 b. 1/,.7" c. 1'"."' d. 1'9.41 =eedback 8!e correc ans%er is< 1'9.41 Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex :ic! &acor &or "K, s!or ic! coil is 5elec one< a. 1.( b. (.// c. (.9,, d. /.4"4 =eedback 8!e correc ans%er is< (.9,, Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase inducton moor is raed "( !# ''( )ols and 174" rm and 7$ o%er &acor. *!a is !e ercen sli+ 5elec one< a. 4.($ b. '."$ c. /.1$ d. /."$ =eedback 8!e correc ans%er is< /.1$ Queston /" Hncorrec Mark (.(( ou o& 1.(( = lag ueston Queston ex =or a 40ole# '0la2er d.c. la %inding %i! '( slos and one conducor er la2er# !e number o& commuaor bars is 5elec one< a. ( b. 4( c. '( d. 1,( =eedback 8!e correc ans%er is< '( Queston /, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A six0ole d2namo# %i! ineroles# reuires /,( inducors on is armaure %i! / urns er coil and ' coil sides er slo. -eermine !e number o& coils# slos and commuaor bars. 5elec one< a. 1'(# 1'(# 1'( b. 1'(# ,(# ,( c. ,(# ,(# 1'( d. ,(# ,(# ,( =eedback 8!e correc ans%er is< ,(# ,(# ,( Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H&# in a /0!ase alernaor# a Ield curren o& "( A roduces a &ull0load armaure curren o& '(( A on s!orcircui and 17/( on oen circui# !en is s2nc!ronous imedance is o!m. 5elec one< a. " b. 4 c. .,, d. /4., =eedback 8!e correc ans%er is< " Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Calculae !e elecrical dislacemen be%een ad;acen slos o& a 1, ole alernaor %i! 144 slos. 5elec one< a. ,( deg b. /( deg c. '( deg d. 1( deg =eedback 8!e correc ans%er is< '( deg Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e ulle2 o& an old gen0se !as a diameer o& '( inc!es. 8!e bel exers a ull o& /"/ lbs
on a ulle2. 8!e gen0se runs a 9(( rm. *!a is !e aroximae ratng o& !e gen0se+ 5elec one< a. / b. 7" c. '"( d. '(( =eedback 8!e correc ans%er is< / Queston 4( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase# /1.7" kA# '/(( alernaor !as an armaure resisance o& (./" o!ms er !ase and s2nc!ronous reacance o& 1.' o!ms er !ase. -eermine !e )olage regulaton a &ull load (., o%er &acor leading. 5elec one< a. ,.1'$ b. 0,.1'$ c. 4.//$ d. 04.//$ =eedback 8!e correc ans%er is< 04.//$ Queston 41 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn !e armaure %inding o& an alernaor# !e coil san &alls s!or o& &ull0ic! b2 ,( degrees elecricalP. 8!e ic! &acor is 5elec one< a. none o& !ese b. (.,, c. (.'" d. (." =eedback 8!e correc ans%er is< (.,, Queston 4' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!a is !e normal secondar2 curren ratng o& curren rans&ormer in ameres+ 5elec one< a. '( b. 1" c. " d. 1( =eedback 8!e correc ans%er is< " Queston 4/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "(( k*# ,((0 -C# 1'0!ase s2nc!ronous con)erer oeraes as a direc con)erer a a &ull load e3cienc2 o& 9'$ and a o%er &acor o& (.9/. Calculae !e AC )olage be%een sli rings and !e AC curren dra%n &rom a 1'0!ase rans&ormer &ed sul2. 5elec one< a. 11( # ''9 A b. 11' # ''9 A c. 11' # '1" A d. 11( # '1" A =eedback 8!e correc ans%er is< 11( # ''9 A Queston 44 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e namelae ratng o& a s!un moor is 1"( !# ,(( )ols# '(" A# 17(( rm. 8!e resisance o& !e s!un Ield circui is '4( o!ms and !e oal armaure circui resisance is (.1" o!m. H& !e moor is o be deli)er &ull0load orue a 1#'(( rm# %!a )alue o& resisance mus be added o !e armaure circui+ 5elec one< a. (.(' o!m b. (.// o!m c. (.'7 o!m d. (.,' o!m =eedback 8!e correc ans%er is< (.'7 o!m Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e edd2 curren and !2seresis losses o& a 4#4((0# ,(06 single0!ase disributon rans&ormer are '( and ",( %a@s# resect)el2. -eermine !e core loss %!en !e rans&ormer is conneced across a 4#,(()ol# "(06 source. 5elec one< a. 9,7 * b. 9/ * c. 994 * d. 977 * =eedback 8!e correc ans%er is< 977 * Queston 4, H ncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e )olage alied o !e !.). side o& a rans&ormer during s!or0circui es is '$ o& is raed )olage. 8!e core loss %ill be ercen o& !e raed core loss. 5elec one< a. (.4 b. 4 c. (.(4 d. (.'" =eedback 8!e correc ans%er is< (.(4 Queston 47 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!ree single0!ase rans&ormers conneced dela0dela &ed a !ree0!ase roar2 con)erer a '#/(( . 8!is con)erer sulies o%er o a -C load !a dra%s 1(( k* a '"( . H& !e roar2 con)erer oeraes a an e3cienc2 o& 9"$ a uni2 &# calculae !e curren in !e secondar2 %indings o& !e rans&ormer bank. 5elec one< a. '49 A b. ''9 A c. /97 A d. /"" A =eedback 8!e correc ans%er is< ''9 A Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o searael2 excied dc s!un generaors are conneced in arallel and carr2 a oal load curren o& " (( ameres. eneraor A !as an armaure resisance o& (.(/ o!m and is generatng a )olage o& '/( )ols. eneraor B !as an armaure resisance o& (.(4 o!m and is gene ratng a )olage o& '/( )ols also. Calculae !e erminal )olage. 5elec one< a. ''1.44 )ols b. '1(."( )ols c. '1".", )ols d. '/( )ols =eedback 8!e correc ans%er is< ''1.44 )ols Queston 49 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 94.("$ b. 9/.7/$ c. 91.7$ d. 9'.1/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston "( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A -C generaor !as no0load ouu )olage o& 1'( )ols. Hs armaure circui resisance is (.9" o!m and is Ield coils are searael2 energied. H& !e load is raed ' k* a 11" . eglectng !e eec o& armaure reacton# %!a o%er could be deli)ered o !e load+ 5elec one< a. '#1( * b. 1#"1 * c. 1#,7( * d. '#((( * =eedback 8!e correc ans%er is< 1#,7( * 6ar)e2 Queston 1 Hncorrec Mark (.(( ou o& 1.(( = lag ueston Queston ex 8!e )olage alied o !e !.). side o& a rans&ormer during s!or0circui es is '$ o& is raed )olage. 8!e core loss %ill be ercen o& !e raed core loss. 5elec one< a. (.'" b. (.4 c. 4 d. (.(4 =eedback 8!e correc ans%er is< (.(4 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston
ex An oen dela bank# consistng o& %o0single !ase rans&ormers is oeratng %i! balanced !ree0 !ase load o& "( kA# 44( a (. & lagging and a single !ase load o& 1( k* resist)e conneced across c0a leg. -eermine !e minimum ratngs o& !e rans&ormers. Assume a !ase seuence o& a0b0c. 5e lec one< a. /".4 kA# /,./4 kA b. /(./ kA# /9."' kA c. /.( kA# /4.(, kA d. /4./' kA# //.4( kA =eedback 8!e correc ans%er is< /.( kA# /4.(, kA Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc resisance es is conduced on a /0!ase '(( kA# '4( )ols# dela conneced generaor. *!en !e %o erminals are conneced &rom , )ols dc source# !e ammeer insered in !e lines reads 1"( ameres. 8!e eect)e resisance o o!mic resisance is 1.'". *!a is !e ercen resisance+ 5elec one< a. 4."$ b. ,$ c. 7."$ d. ,.9$ =eedback 8!e correc ans%er is< ,$ Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '( k*# '(( s!un generaor is oeraed a raed load. H& !e dri)ing engine is de)eloing /( 6:# deermine !e iron and &ricton losses. Armaure resisance is (.(" o!m and Ield resisance is "( o!ms. 5elec one< a. 1(/9 * b. 9"4 * c. 1/4( * d. 9/4 * =eedback 8!e correc ans%er is< 1(/9 * Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An oen dela# !ree0!ase rans&ormer consistng o& %o single0!ase rans&ormers is oeratng %i! a balanced !ree0!ase load o& "( kA# 44(0 a a lagging & o& (.. -eermine !e oeratng & o& eac! rans&ormer. 5elec one< a. (./9/ lagging# (.99/ lagging b. (.// lagging# (.7 lagging c. (./9/ lagging# (.7 lagging d. (.// lagging# (.99/ lagging =eedback 8!e correc ans%er is< (./9/ lagging# (.99/ lagging Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "( 6:# ""( s!un0%ound moor dra%s a line curren o& 4." A a no0load. 8!e s!un Ield resisance is '7" o!ms and !e armaure resisance exclusi)e o& !e brus!es is (./ o!m# !e brus! dro a &ull0load is ' . A &ull0load# !e moor dra%s a line curren o& 4 A. Calculae !e e3cienc2 a &ull0load. 5elec one< a. 91.'$ b. ."$ c. 9.9$ d. 9'.($ =eedback 8!e correc ans%er is< 9.9$ Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A suirrel cage inducton moor %i! namelae daa o& 1"( 6:# /0!ase# 4,( # ,( 6# ,0ole# (." .&. %as sub;eced o cerain er&ormance ess. 8!e es resul readings %ere as &ollo%s< =ull0load curren > '(' A# =ull0load orue > ,7,. lb0?# 5ol)e &or !e ercenage sli. 5elec one< a. /.("$ b. /.'$ c. '.'"$ d. 4.1"$ =eedback 8!e correc ans%er is< /.'$ Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# !e iron loss o& !e rans&ormer a raed )olage bu "( 6 %ould be %a@. 5elec one< a. ,4( b. ( c. 1.'" d. 1(( =eedback 8!e correc ans%er is< ,4( Queston 9 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a 4 ole# /" slo d.c. armaure# calculae !e coil san. 5elec one< a. 9 slos b. 7 slos c. slos d. 1(slos =eedback 8!e correc ans%er is< slos Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& a !2brid seer moor !as a roor ic! o& /, degrees and a se angle o& 9 degres# !e number o& is !ases mus be 5elec one< a. , b. 4 c. / d. ' =eedback 8!e correc ans%er is< 4 Queston 11 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase inducton moor is running a '$ sli. H& !e inu o roor is 1((( *# !en mec!anical o%er de)eloed b2 !e moor is 5elec one< a. 9( * b. '(( * c. '( * d. "(( * =eedback 8!e correc ans%er is< 9( * Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A raed load# a s!un moor dra%s an armaure curren o& "( A &rom a '/( dc mains %!ile running a 1((( rm. A no0load !e armaure curren dros o " A. H& !e eec o& armaure reacton !as %eaken !e Tux b2 '$ &rom no0load o &ull0load# deermine seed o& !e moor a no0load. Assume !e armaure resisance o be ( .1" o!m. 5elec one< a. 1(1( rm b. 1''1 rm c. 11'' rm d. 1'(' rm =eedback 8!e correc ans%er is< 1(1( rm Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A resisor assembl2 &or a %ound roor consiss o& '( elemens o& cas iron grid elemens. 8!e ratng o& eac! is (.1( o!m. *!en ;oined in series and esed across ''( )ols# !e measured curren %as 1(( A. 6o% muc! o%er %as los in !e ;oins+ 5elec one< a. '.1 k* b. '.( k* c. 1.9 k* d. 1. k* =eedback 8!e correc ans%er is< '.( k* Queston 14 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(0ole# 4((0k*# '"(0 dc generaor !as a la0%ound armaure %i! 7" slos eac! !a)ing 1' conducors. 8!e secton o& eac!
conducor is ' x 17." mmf'. H& !e a)erage leng! o& one urn is 1"( cm# Ind !e resisance o& !e armaure. Assume !e seciIc resisance er coer as ' micro0o!m0cm. 5elec one< a. (.((9,4/ o!m b. (.(('"71 o!m c. (.((/"7 o!m d. (.((7714 o!m =eedback 8!e correc ans%er is< (.((/"7 o!m Queston 1" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A single !ase generaor %i! &ull load curren o& 4"( ameres a '4(( )ols !as (.( o!m resisance and s2nc!ronous reacance is '. o!ms. -eermine !e )olage regulaton in ercen a 7"$ o%er &acor lagging. 5elec one< a. ,4 b. 7" c. "" d. 41 =eedback 8!e correc ans%er is< 41 Queston 1, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A d.c. moor de)elos a orue o& '(( 0m a '" rs. A '( rs# i %ill de)elo a orue o& 0m. 5elec one< a. '"( b. 1' c. 1,( d. '(( =eedback 8!e correc ans%er is< '(( Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o s!un generaors A and B# %i! ratngs o& 1"( k* and 1(( k* resect)el2 !a)ing identcal sraig!line )olage )s. ercen k* ouu c!araceristc# are conneced in arallel. 8!e no0load and &ull0load )olage o& '"" and '/( )ols# calculae !e k* ouu o& eac! %!en !e oal load s!ared is '(( k*. 5elec one< a. 11( k* am 9( k* b. 1'" k* am 7" k* c. 1"( k* am "( k* d. 1'( k* am ( k* =eedback 8!e correc ans%er is< 1'( k* am ( k* Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase %ound roor inducton moor# 44( # ,( c2cles# 4 oles is conneced o a um !a deli)ers 1((( c&m o& %aer agains an eect)e !ead o& ?. Fnder !is load# !e moor dra%s 1" k* a a o%er &acor o& (.9(. *!en oeraed %i!ou load# !e moor dra%s (( %a@s. 8!e saor resisance er !ase is (.'1 o!m and !e roor resisance er !ase is (.('' o!m. 8!e urns rato be%een saor and roor is 4 1(( o!ms and series Ield > (.('" o!m. H& !e sra2 o%er losses amoun o 1. k*# k*# sol)e &or !e o)erall e3cienc2 o& !e generaor. generaor. 5elec one< a. ./'$ b. 9(."'$ c. 7.4/$ d. ,./,$ =eedback 8!e correc ans%er is< ,./,$ Queston 4/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A o%er rans&ormer raed raed "(#((( kA# /4." kK1/. k is conneced %2e0%2e. *!a are !e line c urrens a &ull load+ 5elec one< a. 4/.1 A# 1'(7.7 A b. "'"." A# 17'".4 A c. /,.7 A# '(9' A d. 1449./ A# /,'/.' A =eedback 8!e correc ans%er is< /,.7 A# '(9' A Queston 44 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A rans&ormer %!en sul2ing a load mainained 11 k across erminals. *!en !e load %as s%ic!ed o# !e erminal )olage became 11""( . *!a is !e )olage regulaton o& !e load+ 5elec one< a. ""$ b. "."$ c. 11.""$ d. " $ =eedback 8!e correc ans%er is< "$ Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex = ind !e )olage regulaton o%er sul2 %i! 4(( %i!ou load and '(( %i! &ull load. 5elec one< a. 1(($ b. "$ c. "($ d. 1($ =eedback 8!e correc ans%er is< 1(($ Queston 4, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "0!# !ree0!ase# 4((0 sar0conneced suirrel0cage suirrel0cage inducton moor mean o dri)e a milling mac!ine# a sartng akes akes abou 5elec one< a. 1"( A b. '(( A c. 4( A d. 1(( A =eedback 8!e correc ans%er is< 4( A Queston 47 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a " 6# '/( ol# 1"(( rm s!un moor# moor# !e resisance o& !e armaure including brus!es is (.17" o!m and !a o& !e s!un Ield is ,1( o!ms. 8!e sra2 o%er losses %!en !e moor deli)ers raed load a raed )olage is /(" %a@s. 8!e e3cienc2 a raed load is neares o 5elec one< a. 9$ b. 9($ c. 9$ d. "$ =eedback 8!e correc ans%er is< 9$ Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase s2nc!ronous s2nc!ronous moor is measured b2 %o %a@meers A and B. *a@meer A reads '., k* and %a@meer B reads 4,." k*. 8!e inu o%er o& !e moor is under excied and assumed consan. *!a are !e readings o& %a@meers A and B i& !e o%er &acor is "$ and !e moor is o)er0excied+ 5elec one< a. 4'." k*# /'., k* b. "1 k*# '4. 1 k* c. 4., k*# ',." k* d. "'., k*# ''." k* =eedback 8!e correc ans%er is< "1 k*# '4. 1 k* Queston 49 C orrec Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,., k# k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!m er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. Calculae !e maximum o%er !a can be de)eloed b2 !e alernaor a !is exciaton. 5elec one< a. 11 M* b. 9. M* c. 1' M* d. 1( M* =eedback 8!e correc ans%er is< 11 M* Queston "( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1(06:# 1(06:# ""( )ols# ,( 6# /0!ase inducton moor !as a sartng orue o& 1,($ o& &ull0load orue and sartng curren o& 4'"$ o& &ull0load curren. *!a %ill be !e )olage in order !a !e sartng curren be limied o !e &ull0load )alue+ 5elec one< a. 1'"."' b. 1'9.41 c. 1/'.47 d. 1/,.7" =eedback 8!e correc ans%er is< 1'9.41 alenuela alenuela Queston 1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '4( )ol d.c. moor on brake es ook "' Am %!en running a 1"(( rm. 8!e sring balance a !e end o& !e 7, cm brake arm reads 9/." . *!a is !e e3cienc2 o& !e moor a !is load+ 5elec one< a. (." b. (., c. (.9( d. (.9" =eedback 8!e correc ans%er is< (.9( Queston ' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un moor %i! armaure resisance o& (.1' o!m and designed o oerae a 11" # is aking ,( A in armaure curren a &ull0load. -eermine !e )alue o& !e exernal resisance o be insered in !e armaure c ircui so !a !e armaure curren s!all no exceed %ice is &ull0load )alue a sartng. 5elec one< a. (./ o!ms b. (.7 o!ms c. (./ o!ms d. (.( o!ms =eedback 8!e correc ans%er is< (./ o!ms Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 40ole# 1'0slo la %ound d.c. armaure !as ' coil sidesKslo. Assuming single urn coils and rogressi)e %inding# !e back ic! %ould be 5elec
one< a. , b. / c. " d. 7 =eedback 8!e correc ans%er is< 7 Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "(0k*# '"(0 s!or0s!un comound generaor !as !e &ollo%ing daa< Ra > (.(, o!m# Rse > (.(4 o!m and R& > 1'" o!ms. Calculae !e induced armaure )olage a raed load and erminal )olage. 8ake ' as !e oal brus!0conac dro. 5elec one< a. '74.1' b. '7'.1' c. ',.'4 d. '7(.1' =eedback 8!e correc ans%er is< '7'.1' Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase inducton moor is %ound &or 4 oles and is sulied &rom a "( 6 s2sem. *!a is !e roor &reuenc2 %!en roor runs a 141( rm+ 5elec one< a. / 6 b. /." 6 c. '.9 6 d. '." 6 =eedback 8!e correc ans%er is< / 6 Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e secondar2 curren o& a '( kK7.970k auorans&ormer is 1(( ameres. -eermine !e curren !a To%s !roug! !e common %inding. 5elec one< a. 1(( ameres b. "( ameres c. 7( ameres d. ,( ameres =eedback 8!e correc ans%er is< ,( ameres Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An AC suirrel cage inducton moor !as a seed ratng o& 1#7"( rm. H& !e leads are suc! !a !e2 could be reconneced &or conseuen %inding# %!a %ould be !e resultng seed+ 5elec one< a. /#"(( rm b. 7" rm c. /#4"( rm d. 1#7( rm =eedback 8!e correc ans%er is< 7" rm Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e inu and ouu o%ers o& a ''( # s!un moor are /( and ' k* resect)el2. 8!e Ield and armaure circui resisances are 4( o!ms and (.(1'" o!m resect)el2. -eermine !e e3cienc2 o& !e moor i& !e ouu o%er is reduced o 1( k*. 5elec one< a. .,7$ b. /.",$ c. ,.4$ d. 4.9/$ =eedback 8!e correc ans%er is< 4.9/$ Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '(( # 1( A moor could be re%ound &or 1(( # '( A b2 using as man2 urns er coil o& %aer !a)ing cross0sectonal area. 5elec one< a. %ice# !al& b. !al&# %ice c. &our tmes# one0&our! d. !rice# one0!ird =eedback 8!e correc ans%er is< !al&# %ice Queston 1( H ncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(0!# '/(0 s!un moor akes a &ull0load line curren o& 4( A. !e armaure and Ield resisances are (.'" o!m and '/( o!ms# resect)el2. 8!e oal brus!0conac dro is ' and !e core and &ricton losses are /( *. calculae !e e3cienc2 o& !e moor. Assume !a sra20load loss is 1$ o& ouu. 5elec one< a. /."$ b. 7.,$ c. 9,.4$ d. 7.,$ =eedback 8!e correc ans%er is< 7.,$ Queston 11 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e core loss o& a " kA single0!ase rans&ormer %i! normal )olage alied o !e rimar2 is 7" %a@s. 8!e maximum e3cienc2 occurs a ,($ o& &ull0load kA. *!a is !e &ull0load e3cienc2 o& !e rans&ormer a (.( o%er &acor+ 5elec one< a. 91./,$ b. 9/./$ c. 9."'$ d. 9".1,$ =eedback 8!e correc ans%er is< 9/./$ Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& Cu loss o& a rans&ormer a 7K! &ull0load is 49(( *# !en is &ull0load Cu loss %ould be %a@. 5elec one< a. /7" b. ,4(( c. ",(( d. 4'9 =eedback 8!e correc ans%er is< ,4(( Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& a 40ole inducton moor !as a s2nc!ronous seed o& 1"(( rm# !en sul2 &reuenc2 is 5elec one< a. none o& !ese b. '" 6 c. ,( 6 d. "( 6 =eedback 8!e correc ans%er is< "( 6 Queston 14 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A comound d2namo sulies a load o& '( k* a 4(( !roug! a &eeder !a)ing a resisance eual o (.1 o!m. 8!e s!un and series Ield resisances are " o!ms and (.(, o!m resect)el2. -eermine !e oal elecromot)e &orce %!en !e generaor is conneced s!or0 s!un. Assume a brus! conac dro o& 1 er brus! and an armaure resisance o& (.1 o!m. 5elec one< a. 41,.'/ b. 411.4' c. 41'.4' d. 41".4 =eedback 8!e correc ans%er is< 41".4 Queston 1" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An indusrial load is aking "(( k* a (., lagging .&. is desired o raise !e .&. o (.,, lagging using a s2nc!ronous mac!ine %!ose o%er inu is /(( k*. Calculae !e kA ratng o& !e moor reuired &or suc! oe raton and !e o%er &acor a %!ic! !e moor %ill oerae. 5elec one< a. /(" kA# (.', leading b. /( kA# (.,, leading c. /," kA# (.', leading d. /," kA# (.77 leading =eedback 8!e correc ans%er is< /," kA# (.', leading Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e %inding o& a 40ole alernaor !a)ing /, slos and a coil san o& 1 o is s!or0ic!ed b2 degrees. 5elec one< a. 4( b. 14( c. ( d. '( =eedback 8!e correc ans%er is< 4( Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston
ex 8%o /0!ase alernaors oeraton in arallel deli)ers o%er a a line oental o& ''(( ols o an induct)e load o& 1"( k* a ($ .&. H& !e armaure currens o& !e %o alernaors be eual one be oeratng a uni2 .&. 6o% muc! o%er does eac! alernaor sul2 o !e load+ 5elec one< a. bo! 7" k* one a uni2 .&. b. 1(( k* &or uni2 am "( k* c. 11'.7 k* &or uni2 .&. am /.' k* d. 117.' k* &or uni2 .&. am /'. k* =eedback 8!e correc ans%er is< 117.' k* &or uni2 .&. am /'. k* Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 9/.7/$ b. 94.("$ c. 91.7$ d. 9'.1/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston 19 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''(( # '(( !# /0!ase mes! conneced s2nc!ronous moor is %orking on &ull load a an e3cienc2 o& (. and (. & leading. 8!e armaure reacance er !ase is " o!ms. -eermine !e induced em& er !ase. eglec resisance. 5elec one< a. '/( b. '/(7 c. '/77 d. '/4" =eedback 8!e correc ans%er is< '/77 Queston '( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A ,( MA# ,9./0k# !ree !ase s2nc!ronous generaor !as a s2nc!ronous reacance o& 1" o!ms er !ase and negligible armaure resisance. 8!e generaor is deli)ering rae o%er a ($ o%er &acor lagging a raed erminal )olage o an inInie bus0bar. H& !e generaed em& is /, k er !ase# %!a is !e maximum !ree !ase o%er !a !e generaor an deli)er be&ore losing is s2nc!ronism. 5elec one< a. 1'( M* b. /'( M* c. 9, M* d. ' M* =eedback 8!e correc ans%er is< ' M* Queston '1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A d.c. moor de)elos a orue o& '(( 0m a '" rs. A '( rs# i %ill de)elo a orue o& 0m. 5elec one< a. 1' b. '"( c. '(( d. 1,( =eedback 8!e correc ans%er is< '(( Queston '' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase cusomer !as a maximum demand o& " kA. *!a rans&ormer ratng s!all be used i& conneced oen0%2e0oen dela+ 5elec one< a. 4" kA b. 1(( kA c. // kA d. "( kA =eedback 8!e correc ans%er is< "( kA Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un moor %i! an armaure resisance o& (.1" o!m is running a 1'(( rm &or a load %!ic! reuires o& armaure curren o& "( amere &rom a '/( )ol source. A no load# !e armaure curren is " amere. H& !e eec o& armaure reacton !as reduced !e air ga Tux '$ &rom no load o &ull load# %!a is !e no load seed+ 5elec one< a. 1', rm b. 1#'(9 rm c. 1 '1" rm d. 1#'1' rm =eedback 8!e correc ans%er is< 1#'1' rm Queston '4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A long s!un comound generaor deli)ers 1(( A# '"( a raed load. 8!e resisances o& !e )arious %indings are< armaure > (.1 o!m# inerole > (.(' o!m# s!un Ield > 1(( o!ms and series Ield > (.('" o!m. H& !e sra2 o%er losses amoun o 1. k*# sol)e &or !e o)erall e3cienc2 o& !e generaor. 5elec one< a. ./'$ b. 9(."'$ c. 7.4/$ d. ,./,$ =eedback 8!e correc ans%er is< ,./,$ Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure o& a 40ole dc generaor is reuired o generae an e.m.&. o& "'( on oen circui %!en re)ol)ing a a seed o& ,,( rm. Calculae !e magnetc Tux er ole reuired i& !e armaure !as 144 slos %i! ' coil sides er slo# eac! coil consistng o& !ree urns. 8!e armaure is %a)e0%ound. 5elec one< a. '7.4 m*bKole b. "4. m*bKole c. 41.1 m*bKole d. 1/.7 m*bKole =eedback 8!e correc ans%er is< '7.4 m*bKole Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum curren. 5elec one< a. './ kA b. /./ kA c. "./ kA d. 4./ kA =eedback 8!e correc ans%er is< './ kA Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =or sul2ing is a balanced /0!ase load o& 4(0kA# ratng o& eac! rans&ormer in 0 bank# s!ould be nearl2 kA. 5elec one< a. '/ b. '( c. '" d. /4., =eedback 8!e correc ans%er is< '/ Queston ' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex An 0ole# '"( # %a)e0%ound generaor !as 4(( conducors. H& !e generaor is o be la0%ound# !e number o& conducor reuired is 5elec one< a. /'(( b. 1(( c. (( d. 1,(( =eedback 8!e correc ans%er is< 1,(( Queston '9 Hncorrec Mark (.(( ou o& 1.(( = lag ueston
Queston ex A dc s!un moor runs a 9(( rm &rom a 4,( sul2 %!en aking an armaure curren o& '" A. Calculae !e seed o& %!ic! i %ill run &rom a '/( sul2 %!en aking an armaure curren o& 1" A. 8!e resisance o& !e armaure circui is (. o!m. Assume Tux er ole a '/( !a)e o decrease o 7"$ o& is )alue a 4,( 5elec one< a. "9" b. 49" c. 4" d. " " =eedback 8!e correc ans%er is< "9" Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e namelae ratng o& a s!un moor is 1"( !# ,(( )ols# '(" A# 17(( rm. 8!e resisance o& !e s!un Ield circui is '4( o!ms and !e oal armaure circui resisance is (.1" o!m. H& !e moor is o be deli)er &ull0load orue a 1#'(( rm# %!a )alue o& resisance mus be added o !e armaure circui+ 5elec one< a. (.(' o!m b. (.'7 o!m c. (.// o!m d. (.,' o!m =eedback 8!e correc ans%er is< (.'7 o!m Queston /1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o single !ase rans&ormers %i! eual ratngs and urns rato are oeraed in arallel o sul2 a load o& 1( k* a a lagging & o& (.9(. 8rans&ormer A !as a resisance o& 1$ and a reacance o& ,$. 8rans&ormer B !as a resisance o& '$ and a reacance o& "$. Calculae !e o%er deli)ered b2 eac! rans&ormer. 5elec one< a. 79 k*# 9' k* b. / k*# 97 k* c. ( k*# 1(( k* d. k*# 9' k* =eedback 8!e correc ans%er is< ( k*# 1(( k* Queston /' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0sack R seer moor !as a se angle o& 1( degrees. *!a is !e number o& roor ee! in eac! sack+ 5elec one< a. /, degrees b. 1 deg rees c. 1' degrees d. '4 degrees =eedback 8!e correc ans%er is< 1' degrees Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''(0 s!un moor deli)ers 4( ! on &ull0load a 9"( rm and !as an e3cienc2 o& $. 8!e armaure and Ield resisances are (.' o!m and 11( o!ms# resect)el2. -eermine !e sartng resisance suc! !a !e sartng armaure curren does no exceed 1., tmes !e &ull0load curren. 5elec one< a. (.71' o!m b. (.7/9 o!m c. (.7(4 o!m d. (.7/' o!m =eedback 8!e correc ans%er is< (.7(4 o!m Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e rato o& !e rimar2 o secondar2 )olage o& a rans&ormer is ' (.(" o!m and R& > "7." o!ms. H& !e generaor oeraes a raed )olage# calculae !e induced )olage a !al& &ull0 load. eglec brus!0conac dro. 5elec one< a. '41 b. '"' c. '/.' d. '/ =eedback 8!e correc ans%er is< '41 Queston '" Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex 8!e roor o& a
''( # ,( 6# 40ole inducton moor !as a o%er inu o& ( k* is obser)ed !a !e roor em& makes 9( c2cles er minue. Calculae !e roor coer loss. 5elec one< a. 4 k* b. ' k* c. / k* d. " k* =eedback 8!e correc ans%er is< ' k* Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A long0s!un comound generaor sulies "( k* a '/( . !e oal Ield0 and armaure0circui resisances are 4, o!ms and (.(/ o!m# resect)el2. 8!e brus!0conac dro is ' . -eermine !e ercen )olage regulaton. eglec !e armaure reacton. 5elec one< a. /."7$ b. /.77$ c. /.97$ d. '.9$ =eedback 8!e correc ans%er is< /.77$ Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!a is !e &reuenc2 o& !e generaed em& o& a 1( ole alernaor dri)en a 7'( rm+ 5elec one< a. ,( 6 b. '" 6 c. "" 6 d. "( 6 =eedback 8!e correc ans%er is< ,( 6 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase# 0ole dela conneced generaor !as a line curren o& "(( ameres. H& con)ered in %2e# %!a is !e olerable curren+ 5elec one< a. /71." A b. '.7 A c. '4".1 A d. /1".' A =eedback 8!e correc ans%er is< '.7 A Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4 ole# 1' slo la0%ound dc armaure !as %o coil sidesKslo. Assuming single urn coil# calculae !e back ic! &or rogressi)e and rerogressi)e %inding. 5elec one< a. / am " b. , am 4 c. 7 am " d. " am / =eedback 8!e correc ans%er is< 7 am " Queston /( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex H& !ree rans&ormers in a dela0 dela are deli)ering !eir raed load and one rans&ormer is remo)ed# !en o)erload and e ac! o& !e remaining rans&ormer is ercen. 5elec one< a. " b. 7/.' c. 17/.' d. ,,.7 =eedback 8!e correc ans%er is< 7/.' Queston /1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase 0 conneced s2nc!ronous moor %i! a line0o0line )olage o& 44( and a s2nc!ronous seed o& 9(( rm oeraes %i! a o%er o& 9 k* and a lagging o%er &acor o& (.. 8!e s2nc!ronous reacance er !ase is 1( o!ms. -eermine !e orue angle in elecrical degrees. 5elec one< a. /"."1 degrees b. /.4, degrees c. //."1 degrees d. /,.// degrees =eedback 8!e correc ans%er is< /"."1 degrees Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4#4(( )ol# ,( 6 rans&ormer !as a core loss o& 4( *a@s# o& %!ic! one0!ird is edd20curren loss. -eermine !e core loss o& !is rans&ormer %!en i is conneced o a 4#,(( ols# "( 6. 5elec one< a. ,79 *a@s b. 79 *a@s c. 779 *a@s d. 977 *a@s =eedback 8!e correc ans%er is< 977 *a@s Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o s!un generaors oeratng in arallel are gi)ing a oal ouu o& /'( k*. eneraor A< Armaure resisance > (.(' o!m# Hnduced em& > 4"( eneraor B# Armaure resisance > (.('" o!m# Hnduced em& > 4,( . =ind !e bus bar )olage. eglec s!un Ield curren. 5elec one< a. 44,." b. 4"(./ c. 44,." d. 4,4.' =eedback 8!e correc ans%er is< 44,." Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /(0kA# '#4((K'4( )ols# ,(06 rans&ormer !as a &ull0load o%er o& uni2 o)er !e eriod o& '4 !rs. 8!e maximum e3cienc2 is 9"$ and i occurs a &ull0 load. Calculae !e all0da2 e3cienc2 i& loaded ,0!ours a &ull0load. 5elec one< a. ./$ b. 9'.4"$ c. 7.9($ d. 9.,7$ =eedback 8!e correc ans%er is< ./$ Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!en a 4((0# "(06# ,0ole inducton moor is roatng a 9,( rm on no0 load# is sli is 5elec one< a. / er cen b. 4 er cen c. ' er cen d. 1 er cen =eedback 8!e correc ans%er is< 4 er cen Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind !e rimar2 )olage o& a o%er rans&ormer under !e &ollo%ing conditons / urns &or rimar2# , urns &or secondar2 and 1'( )ols &or secondar2 )olage. 5elec one< a. )ols b. 1' )ols c. ,( )ols d. , )ols =eedback 8!e correc ans%er is< ,( )ols Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '4( )ols dc s!un moor !as an armaure curren o& "( amere# armaure resisance o& (.'" o!m running a 1'(( rm. H& i is run a ''( )ols# %!a )alue o& armaure curren %!en dri)ing !e same load. 8!e Ield is ad;used so !a !e seed remains a 1'(( rm. 5elec one< a. ,( b. "" c. "( d. "7." =eedback 8!e correc ans%er is< "" Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a brake es !e eect)e load on !e branc! ulle2 %as /.1 kg# !e eect)e diameer o& !e ulle2 is ,/." cm and !e seed is 1' r..s. 8!e moor ook 49 amere a ''( )ols. *!a is !e e3cienc2 a !is load+ 5elec one< a. ,$ b. /$ c. "$ d. ($ =eedback 8!e correc ans%er is< /$
Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''( )ols single !ase inducton moor dra%s curren o& 1( ams a (.7" &. A caacior o& "( micro0= is conneced in order o imro)e !e o%er &acor. *!a is !e ne% o%er &acor+ 5elec one< a. (.9" leading b. (. ,, leading c. (.,, lagging d. (.9" lagging =eedback 8!e correc ans%er is< (.9" lagging Queston 4( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 40ole moor is la %ound %i! 7' conducors# and !as a Tux o& '" m*b er ole. 8!e armaure akes "( A in c urren !e resulan demagneting eec due o armaure reacton reduces !e air0ga Tux b2 "$. Calculae !e de)eloed orue. 5elec one< a. 1,7./ 0m b. 1/7., 0m c. 144. 0m d. 17,./ 0m =eedback 8!e correc ans%er is< 1/7., 0m Queston 41 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure o& a moor !as o& 4(( act)e conducors# !e Tux densi2 in !e Ie ld being /((( gauss. 8!e axial leng! o& !e armaure is '(./' cm. 8!e curren is /( ameres. -eermine !e oal &orce exered in !e armaure. 5elec one< a. (.(7 b. 4/9.' c. 7/1." d. ,4".9 =eedback 8!e correc ans%er is< 7/1." Queston 4' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!or0s!un comound generaor deli)ers a load curren o& "( A a a erminal )olage o& '"( )ols. 8!e armaure# series Ield# s!un Ield resisances are (.(" o!m# (.(/ o!m and '"( o!ms resect)el2. *!a is !e generaed em& o& !e mac!ine+ 5elec one< a. '"4.(" b. ',(.4" c. '"7./4 d. '"( =eedback 8!e correc ans%er is< '"4.(" Queston 4/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase %2e conneced ac generaor is raed 1"(( kA# 11((( . 8!e eect)e resisance and s2nc!ronous reacance er !ase are 1." o!ms and /( o!ms resect)el2. 8o %!a )alue %ill !e erminal )olage rise %!en &ull0load a (. & lagging is s%ic! o. 5elec one< a. 1/ k b. 1' k c. 1" k d. 14 k =eedback 8!e correc ans%er is< 14 k Queston 44 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o searael2 excied dc s!un generaors are conneced in arallel and carr2 a oal load curren o& "(( ameres. eneraor A !as an armaure resisance o& (.(/ o!m and is gene ratng a )olage o& '/( )ols. eneraor B !as an armaure resisance o& (.(4 o!m and is generatng a )olage o& '/( )ols also. Calculae !e erminal )olage. 5elec one< a. '1(."( )ols b. '1".", )ols c. '/( )ols d. ''1.44 )ols =eedback 8!e correc ans%er is< ''1.44 )ols Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc series generaor is sul2ing a curren o& " A o a series lig!tng s2sem !roug! a &eeder o& oal resisance# 1 o!m. 8!e erminal )olage is '"(( )ols. 8!e armaure and series Ield resisances are 1 and 1" o!ms# resect)el2. A /( o!m di)erer resisance is s!uned across !e series Ield. -eermine !e generaed o%er o& !e generaor. 5elec one< a. 1'./'9 k* b. 1/.,( k* c. 1/.''" k* d. 1/.7"( k* =eedback 8!e correc ans%er is< 1/.''" k* Queston 4, Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A "(( kA# 1/'((K'4(( )ols ,( 6 single !ase rans&ormer !as a 4$ reacance and 1$ resisance. 8!e core loss under raed conditon is 1(( %a@s. Calculae !e ercen e3cienc2 o& !is rans&ormer a &ull load and "$ o%er &acor. 5elec one< a. 9,. b. 9.4 c. 97., d. 9,.' =eedback 8!e correc ans%er is< 9.4 Queston 47 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e dc ouu o& a six0 !ase sar0conneced con)erer is "(( k* a 4(( . H& !e & and e3cienc2 o& !e mac!ine is (.,, and (.9' resect)el2# deermine !e ac curren dra%n &rom !e sul2. 5elec one< a. 7/' A b. 7'9 A c. 7,' A d. 74( A =eedback 8!e correc ans%er is< 74( A Queston 4 Hncorrec Mark ( .(( ou o& 1.(( =lag ueston Queston ex *!a is !e a)erage )olage generaed in a mo)ing conducor i& i cus '." x 1(f, max%ells in 1K4( second+ 5elec one< a. ' )ols b. 1( )ols c. 1 )ol d. 1(( )ols =eedback 8!e correc ans%er is< 1 )ol Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4((0# "(06 !ree0!ase inducton moor roaes a 144( rm on &ull0load. 8!e moor is %ound &or 5elec one< a. 40 oles b. 0oles c. ,0oles d. '0oles =eedback 8!e correc ans%er is< 40oles Queston "( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( . 8!e armaure e3cienc2 is 9"$. *!a is !e back em&+ 5elec one< a. 117 )ols b. 11 )ols c. 114 )ols d. 1'' )ols =eedback 8!e correc ans%er is< 114 )ols H\\AO Queston 1 Hncorrec Mark (.(( ou o& 1.(( Queston ex A 40ole# simlex# %a)e0%ound generaor !as "7 slos# %!a is !e coil ic!+ 5elec one< a. 4 b. 14.'" c. 14 d. 7 =eedback 8!e correc ans%er is< 14 Queston ' H ncorrec Mark (.(( ou o& 1.(( Queston
ex =or a 40ole# '0la2er d.c. la %inding %i! '( slos and one conducor er la2er# !e number o& commuaor bars is 5elec one< a. 4( b. 1,( c. '( d. ( =eedback 8!e correc ans%er is< '( Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1'(( kA# ,,(( )ol# / 0!ase# 0conneced alernaor !as an eect)e resisance o& (.4( o!m and a reacance o& , o!ms er !ase. H deli)ers &ull load curren o& (.( lagging o%er &acor a raed )olage. *!a %ill be !e erminal )olage &or !e same exciaton and load curren i& !e o%er &acor is (.( leading+ 5elec one< a. 97 b. 4'"( c. 4",( d. 79 =eedback 8!e correc ans%er is< 79 Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A uant2 is exressed in er uni i& i is di)ided b2 a c!osen base uant2 !a)ing !e same !2sical dimensionP. 5uose !a &or a 1(0kA# '4((0K'4(0 rans&ormer %e c!oose< :base> 1(k*# 1#base > '4(( # '#base > '4( . 8!is rans&ormer !as !e &ollo%ing es daa< Oen0 circui es lo%0)olage sideP< '4( # (. A# ( * 5!or0circui es !ig!0)olage sideP< ( # ".1 A# ''( *. *!a is !e series resisance in er uni+ 5elec one< a. (.(14 u b. (.(114 u c. (.(1, u d. (.(14 u =eedback 8!e correc ans%er is< (.(14 u Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& a !2brid seer moor !as a roor ic! o& /, degrees and a se angle o& 9 degres# !e number o& is !ases mus be 5elec one< a. 4 b. ' c. , d. / =eedback 8!e correc ans%er is< 4 Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind !e )olage regulaton o%er sul2 %i! 4(( %i!ou load and '(( %i! &ull load. 5elec one< a. 1(($ b. "$ c. "($ d. 1($ =eedback 8!e correc ans%er is< 1(($ Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e :8s o& a ''( k ransmission line !a)e a rato o& 1/'.7, kK,,./7" are conneced %2e0%2e. A )olmeer conneced line o ground reads ,, )ols# %!a is !e ransmission line )olage+ 5elec one< a. '' (.1( k b. ''".'" k c. ''/.1" k d. ''.,/ k =eedback 8!e correc ans%er is< ''.,/ k Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# !e iron loss o& !e rans&ormer a raed )olage bu "( 6 %ould be %a@. 5elec one< a. ( b. 1(( c. 1.'" d. ,4( =eedback 8!e correc ans%er is< ,4( Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase alernaor !as , slos er ole er !ase. -eermine !e disributon &acor. 5elec one< a. (.9,/ b. (.9", c. (.94 d. (.977 =eedback 8!e correc ans%er is< (.9", Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '#"(( kA# !ree0!ase# ,(06# ,., k %2e0conneced alernaor !as a Ield resisance o& (.4" o!m and an armaure resisance o& (.(" o!m er !ase. 8!e Ield curren a &ull load (." o%er &acor is '(( A. 8!e sra2 o%er losses amoun o ' k*. Calculae !e e3cienc2 o& !e alernaor a &ull0load# (." o%er &acor lagging. 5elec one< a. 9,./$ b. 94.$ c. 9".'$ d. 9/.7$ =eedback 8!e correc ans%er is< 9".'$ Queston 11 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e number o& arallel a!s in !e armaure %inding o& a &our ole %a)e conneced dc mac!ine !a)ing '' coil0sides is 5elec one< a. ' b. 4 c. 11 d. '' =eedback 8!e correc ans%er is< ' Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o rans&ormers A and B !a)ing eual ouus and )olage ratos bu uneual ercenage imedances o& 4 and ' are oeratng in arallel. 8rans&ormer A %ill be running o)er0load b2 ercen. 5elec one< a. '" b. "( c. ,, d. // =eedback 8!e correc ans%er is< // Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a ,0ole d.c. mac!ine# 9( mec!anical degrees corresond o elecrical deg rees. 5elec one< a. /( b. '7( c. 1( d. 4" =eedback 8!e correc ans%er is< '7( Queston 14 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure and Ield circuis o& a '/( ol s!un moor !a)e resisance o& (./1 and 11" o!ms resect)el2. H akes "' Am %!en oeratng a a cerain load. *!a is !e armaure o%er de)eloed+ 5elec one< a. 14.4 ! b. 1'.4 ! c. '4., ! d. 7." ! =eedback 8!e correc ans%er is< 14.4 ! Queston 1" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase# /1.7" kA# '/(( alernaor !as an armaure resisance o& (./" o!ms er !ase and s2nc!ronous reacance o& 1.' o!ms er !ase. -eermine !e )olage regulaton a &ull load (., o%er &acor leading. 5elec one< a. 4.//$ b. 0,.1'$ c. ,.1'$ d. 04.//$ =eedback 8!e correc ans%er is< 04.//$ Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A %ound roor moor# 7." 6:# '/(
)ols# /0!ase akes a line curren o& 1.4 ameres# %!en oeratng a raed ouu a an e3cienc2 o& $. Calculae !e indicatons on %a@meers %!en !ese are insered o measure o%er b2 !e %o %a@meer me!od. 5elec one< a. 4.'/' k*# '.1', k* b. /.9(' k*# '.4", k* c. 4.(/" k*# './'" k* d. /."" k*# '."(/ k* =eedback 8!e correc ans%er is< 4.'/' k*# '.1', k* Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1" ! ''( )ol# 1'(( rm s!un moor akes "( Ameres. Hs armaure resisance is (.1 o!m and Ield resisance is ''( o!ms. Brus! conac )olage dro is ' )ols. =ricton and %indage loss is 4(( %a@s and sra2 load loss o& 1$ o& !e ouu. Calculae !e e3cienc2. 5elec one< a. 94.,$ b. 91.$ c. 9'.4$ d. 9.4$ =eedback 8!e correc ans%er is< 91.$ Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e s!a? o%er o& a s!un moor is 7. !. H dra%s "( A &rom 1'( . 8!e Ield %inding dra%s 1.' A. *!a is !e e3cienc2 o& !e moor+ 5elec one< a. 9/$ b. 9,.9$ c. 94.7$ d. 9.'$ =eedback 8!e correc ans%er is< 9,.9$ Queston 19 Correc Mark 1 .(( ou o& 1.(( =lag ueston Queston ex A ''( s!un moor dri)ing is normal load dra%s an armaure curren o& "( A &rom a ''( dc source. 8!e armaure resisance o& !is moor including brus!es is (.'" o!m. 6o% muc! armaure curren minimumP %ill !is moor dra% &rom a '(( dc source %!en dri)ing !e same load %i! !e Ield ad;used o mainain !e same seed+ 5elec one< a. "".7, A b. ,(.1' A c. ,/.4 A d. ".'4 A =eedback 8!e correc ans%er is< "".7, A Queston '( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 40ole la0%ound armaure !as 144 slos %i! %o coil sides er slo# eac! coil !a)ing %o urns. H& !e Tux er ole is ' m*b and !e armaure roaes a 7'( rm. *!a is !e induced )olage+ 5elec one< a. ,9.1' b. 1/.'4 c. '7,.4 d. /4.9, =eedback 8!e correc ans%er is< ,9.1' Queston '1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance o o!mic resisance is 1.". 8!e o!mic resisance is obained b2 connectng %o erminals o a d.c source. 8!e curren )olage are 7., Ameres and , )ols resect)el2. *!a is !e ercen resisance+ 5elec one< a. ' b. 1 c. / d. 4.' =eedback 8!e correc ans%er is< / Queston '' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "(0k* 4,0)ol s!un generaor !as a )olage regulaton o& .7 ercen. Calculae !e no0load erminal )olage. 5elec one< a. "(" b. 49( c. "(( d. 47" =eedback 8!e correc ans%er is< "(( Queston '/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e inu and ouu o%ers o& a ''( # s!un moor are /( and ' k* resect)el2. 8!e Ield and armaure circui resisances are 4( o!ms and (.(1'" o!m resect)el2. -eermine !e e3cienc2 o& !e moor i& !e ouu o%er is reduced o 1( k*. 5elec one< a. .,7$ b. 4.9/$ c. ,.4$ d. /.",$ =eedback 8!e correc ans%er is< 4.9/$ Queston '4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 9'.1/$ b. 94.("$ c. 91.7$ d. 9/.7/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 7(0!# '/(0)ols# /0!ase inducton moor oeratng a (.77 o%er &acor !as a sartng curren o& " tmes is &ull0load curren. Calculae !e sartng curren. 5elec one< a. 17( ams b. 1#47" ams c. '9" ams d. "1 ams =eedback 8!e correc ans%er is< "1 ams Queston ', Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 44( )ol s!un moor !as an armaure resisance o& (. o!m and Ield resisance o& '(( o!ms. *!a is !e armaure o%er de)eloed %!en gi)ing an ouu o& 7.4, k* a "$ e3cienc2+ 5elec one< a. 7.4, k* b. 7.", k* c. .4, % d. 7.'/k* =eedback 8!e correc ans%er is< 7.", k* Queston '7 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex Hn a brake es !e eect)e load on !e branc! ulle2 %as /.1 kg# !e eect)e diameer o& !e ulle2 is ,/." cm and !e seed is 1' r..s. 8!e moor ook 49 amere a ''( )ols. *!a is !e e3cienc2 a !is load+ 5elec one< a. "$ b. ($ c. /$ d. ,$ =eedback 8!e correc ans%er is< /$ Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An inducton moor o& /(0!# ''(0)ols# /0!ase dra%s 4"( ercen o& !e raed curren %i! !e raed )olage and deli)ers during !e sartng eriod 1/( ercen o& !e raed orue. 8!e &ull0load e3cienc2 and &ull0load o%er &acor o& !is moor is ($ and 7($ resect)el2. H& an auorans&ormer is used as a sartng uni and sartng orue o&
!e load is onl2 "( ercen o& !e raed orue o& !e moor# Ind !e sartng )olage and sartng cur ren o& !e line. 5elec one< a. 17.9( )ols and '., ams b. ''( )ols and ''7./ ams c. 1/,.44 )ols and '9'.7 ams d. '4".7 )ols and /(1.4 ams =eedback 8!e correc ans%er is< 1/,.44 )ols and '9'.7 ams Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /#,(( )ols !ree0!ase sar conneced urbo s2nc!ronous generaor o& s2nc!ronous reacance o& (." o!m er !ase and negligible resisance is sul2ing /(#((( kA a (. & lagging o a large o%er s2sem. H& !e seam sul2 is cu0o# calculae !e amoun o& curren !a !e generaor %ill !en carr2 assuming negligible losses. 5elec one< a. /(94 A b. /'/ A c. /9(1 A d. /7( A =eedback 8!e correc ans%er is< /7( A Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& maximum orue o& an inducton moor is '(( kg0m a a sli o& 1'$# !e orue a ,$ sli %ould be kg0m. 5elec one< a. 1(( b. 1,( c. "( d. 4( =eedback 8!e correc ans%er is< 1,( Queston /1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!or s!un comound generaor deli)ers 1"( A a a erminal )olage o& '/( . 8!e s!un Ield curren is '." A. 8!e resisance o& !e armaure# series Ield and di)erer are (.(/' o!m# (.(1" o!m and (.(/ o!m# resect)el2. Calculae !e elecrical e3cienc2 o& !e generaor a !is load. 5elec one< a. 9,.4$ b. 9/.$ c. 94.'$ d. 9".7$ =eedback 8!e correc ans%er is< 9".7$ Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '( k*# '(( s!un generaor is oeraed a raed load. H& !e dri)ing engine is de)eloing /( 6:# deermine !e iron and &ricton losses. Armaure resisance is (.(" o!m and Ield resisance is "( o!ms. 5elec one< a. 9/4 * b. 1/4( * c. 1(/9 * d. 9"4 * =eedback 8!e correc ans%er is< 1(/9 * Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e curren !a To%s !roug! !e common %inding o& a '(0kK7.97 k auorans&ormer is '(( ameres. -eermine !e secondar2 curren. 5elec one< a. ''( ameres b. //( ameres c. 1"( ameres d. '(( ameres =eedback 8!e correc ans%er is< //( ameres Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e &reuenc2 o& em& generaed in an 0ole alernaor running a 9(( rm is 5elec one< a. ,( 6 b. none o& !ese c. "( 6 d. 1'( 6 =eedback 8!e correc ans%er is< ,( 6 Queston /" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A bel0dri)en 1"( k* s!un %ound -C generaor is running a 4"( rm and is sul2ing &ull0load o a bus bar a '4( . A %!a seed %ill i run i& !e bel breaks and !e mac!ine contnues o run aking ." k* &rom !e bus bar+ 8!e armaure and Ield resisance are (.(" o!m and " o!ms resect)el2. 8!e brus! conac dro is 1." er brus!. eglec armaure reacton. 5elec one< a. /" rm b. / rm c. /9" rm d. 4(' rm =eedback 8!e correc ans%er is< /9" rm Queston /, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex =or a coil !a)ing a san o& 'K/ or ole ic!# !e coil san &acor is 5elec one< a. (.7, b. (.9,, c. (. d. (.,, =eedback 8!e correc ans%er is< (.,, Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o /0!ase alernaors oeraton in arallel deli)ers o%er a a line oental o& ''(( ols o an induct)e load o& 1"( k* a ($ .&. H& !e armaure currens o& !e %o alernaors be eual one be oeratng a uni2 .&. 6o% muc! o%er does eac! alernaor sul2 o !e load+ 5elec one< a. 1(( k* &or uni2 am "( k* b. 117.' k* &or uni2 .&. am /'. k* c. 11'.7 k* &or uni2 .&. am /.' k* d. bo! 7" k* one a uni2 .&. =eedback 8!e correc ans%er is< 117.' k* &or uni2 .&. am /'. k* Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e losses in a ''( # !ree0!ase# '" 6# 40ole inducton moor a &ull0load are as &ollo%s< Core > /.($# =ricton and %indage > '.($# 5aor Cu loss > 4.($# Roor Cu loss > '.($# A 7($ o& &ull0load o& !e mac!ine# deermine is seed and e3cienc2 5elec one< a. 1#17( rm and .7$ b. 1#'(( rm and 9.1$ c. 1#(( rm and 7.9/$ d. 74( rm and 9.1$ =eedback 8!e correc ans%er is< 74( rm and 9.1$ Queston /9 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '4( )ol d.c. moor on brake es ook "' Am %!en running a 1"(( rm. 8!e sring balance a !e end o& !e 7, cm brake arm reads 9/." . *!a is !e e3cienc2 o& !e moor a !is load+ 5elec one< a. (.9" b. (." c. (.9( d. (., =eedback 8!e correc ans%er is< (.9( Queston 4( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A single !ase ,( 6 rans&ormer !as is core )alue o& 1." x 1(f0/ cu m. 8!e maximum Tux densi2 is 1.( 8esla and !e !2seresis consan o& !e core is 7"((. =ind !e !2seresis loss. 5elec one< a.
7"" *a@s b. ,7" *a@s c. /"" *a@s d. '"" *a@s =eedback 8!e correc ans%er is< ,7" *a@s Queston 41 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e ne cross secton o& a rans&ormer is '( suare inc!es. 8!e maximum Tux densi2 is 11 kilogausses. 8!e &reuenc2 is ,( 6. H& !ere are 1#((( urns in !e rimar2# deermine !e rimar2 induced em&. 5elec one< a. /"( b. /"9( c. /7( d. /94" =eedback 8!e correc ans%er is< /7( Queston 4' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e curren a !e common %inding o& a '(kK7.97k auo0rans&ormer is '((A. *!a is !e curren a !e secondar2+ 5elec one< a. //'.4" A b. 14'.'' A c. 1/'.4" A d. '(( A =eedback 8!e correc ans%er is< //'.4" A Queston 4/ Hncorrec Mark (.(( ou o& 1.(( = lag ueston Queston ex A 1(06:# 40ole# '" 6# /0!ase inducton moor is aking 91(( %a@s &rom !e line. Core loss is '9( %a@s saor coer loss is ", %a@s roor coer loss is 44" %a@s and !e &ricton and %indage loss is 1'1 %a@s. -eermine !e ouu orue in e%on0meers. 5elec one< a. 1(1.' b. 11'." c. 1(.4 d. 1(/./ =eedback 8!e correc ans%er is< 1(/./ Queston 44 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 6o% man2 arallel a!s does a ,0ole rilex la0%ound conneced armaure %inding o& a dc generaor !a)e+ 5elec one< a. / b. 1 c. , d. 1' =eedback 8!e correc ans%er is< 1 Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "(( k*# ,((0 -C# 1'0!ase s2nc!ronous con)erer oeraes as a direc con)erer a a &ull load e3cienc2 o& 9'$ and a o%er &acor o& (.9/. Calculae !e AC )olage be%een sli rings and !e AC curren dra%n &rom a 1'0!ase rans&ormer &ed sul2. 5elec one< a. 11' # '1" A b. 11( # ''9 A c. 11( # '1" A d. 11' # ''9 A =eedback 8!e correc ans%er is< 11( # ''9 A Queston 4, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "((( kA# /0!ase# 1( k# "( 6 alernaor runs a 1"(( rm conneced o consan &reuenc2# consan )olage busbars. H& !e momen o& inerta o& entre roatng s2sem is 1." x 1(f4 kg0mf' and !e sead2 s!or circui curren is " tmes !e normal &ull load curren. Calculae !e naural tme eriod o& oscillaton. 5elec one< a. 1./ sec b. 1.' sec c. 1.4 sec d. 1." sec =eedback 8!e correc ans%er is< 1.4 sec Queston 47 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /(0kA# '#4((K'4( )ols# ,(06 rans&ormer !as a &ull0load o%er o& uni2 o)er !e eriod o& '4 !rs. 8!e maximum e3cienc2 is 9"$ and i occurs a &ull0load. Calculae !e all0da2 e3cienc2 i& loaded ,0!ours a &ull0load. 5elec one< a. ./$ b. 7.9($ c. 9'.4"$ d. 9.,7$ =eedback 8!e correc ans%er is< ./$ Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o %a@meer me!od is used o es a '" 6:# '/( )ol# 1(( rm# ,( c2cle# /0!ase inducton moor. *!en !e line )olages are '/( )ols# one %a@meer reads G1/#4(( %a@s and !e o!er G7#4(( %a@s. -eermine moor line curren. 5elec one< a. ".4 A b. ""., A c. "'./ A d. "(. A =eedback 8!e correc ans%er is< ".4 A Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex An oen0dela conneced rans&ormer bank ser)es a balanced /0!ase load o& 4( kA a '/( and (.,, & lagging. 5ol)e &or !e real o%er and & a %!ic! eac! rans&ormer is oeratng. 5elec one< a. 11."4 k* a (.,, & and '/.(9 k* a (.7(7 & b. 1'.'' k* a (.,, & and ''.4'9 k* a (.7(7 & c. 1'.'' k* a ( ." & and ''.4' a uni2 & d. 11."4 k* a (." & and '/.(9 k* a uni2 & =eedback 8!e correc ans%er is< 11."4 k* a (." & and '/.(9 k* a uni2 & Queston "( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A /0!ase alernaor generaes an oen0 circui !ase )olage o& 4((( %!en excitng curren is "( A !e s!or0circui curren &or !e same exciaton being (( A. 8!e s2nc!ronous reacance er !ase is 5e lec one< a. ( o!ms b. none o& !ese c. 1" o!ms d. " o!ms =eedback 8!e correc ans%er is< " o!ms =E\H[ A dc s!un moor de)elos 1" ! a 1'( . 8!e armaure e3cienc2 is 9"$. *!a is !e back em&+ 5elec one< a. 117 )ols b. 1'' )ols Hncorrec c. 11 )ols d. 114 )ols =eedback 8!e correc ans%er is< 114 )ols Queston ' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A 10!ase# 1(( kA# '4((K'4( ol# ,( 6 rans&ormer !as a rimar2 resisance and secondar2 %inding resisance o& (.' o!ms and (.((9 o!m resect)el2. Calculae !e eui)alen resisance re&erred o !e rimar2. 5elec one< a. 1.7' o!ms b. 1., o!ms c. (./7 o!ms Hncorrec d. 1.4, o!ms =eedback 8!e correc ans%er is< 1.7' o!ms Queston / Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield
curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum curren. 5elec one< a. "./ kA b. './ kA c. 4./ kA d. /./ kA Hncorrec =eedback 8!e correc ans%er is< './ kA Queston 4 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex An ac generaor 1"(( kA caaci2 !as a &ull load e3cienc2 o& 91$ a 1(($ o%er &acor and ,$ e3cienc2 a ($ o%er &acor lagging. *!a engine dri)e in 6 is reuired i& !e gense is o sul2 entrel2 incandescen lam+ 5elec one< a. 19( b. /1'" c. '"'" Hncorrec d. ''1( =eedback 8!e correc ans%er is< ''1( Queston " Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '((( kA# /4#"((K'4( )ols# ,( 6# /0!ase oil0Illed rans&ormer !as an imedance o& ".7"$. -eermine !e secondar2 &ull load curren. 5elec one< a. 411 b. "'( Hncorrec c. "/"( d. "1(' =eedback 8!e correc ans%er is< 411 Queston , Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A searael2 excied generaor generaes '/( )ols %!en dri)en a 1'(( rm. H& !e Tux is decrease b2 1($# %!a is !e ne% em& %i! seed remains !e same+ 5elec one< a. '(7 )ols b. '"/ )ols c. '/( )ols d. '", )ols Hncorrec =eedback 8!e correc ans%er is< '(7 )ols Queston 7 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '((0kA rans&ormer %i! imedance o& "$ and !e o%er &acor o& !e load is "$. 8!e rimar2 )olage is ,#((( )ols %!ile !e coer loss is " k*. =ind !e ercenage regulaton. 5elec one< a. ".'1$ b. 4.4/$ Correc c. ".(/$ d. 4.(/$ =eedback 8!e correc ans%er is< 4.4/$ Queston Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '"( # /( 6 generaor sulies o%er o a arallel circui consistng o& a '( ! moor %!ose e3cienc2 is 9($ a (.( & lagging and a second load !a dra%s an aaren o%er o& 7 kA a uni2 &. -eermine !e s2sem react)e o%er. 5elec one< a. 1'.4/" kAR Correc b. '/."' kAR c. 1(./41 kAR d. '(./4 kAR =eedback 8!e correc ans%er is< 1'.4/" kAR Queston 9 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e dierence be%een !e &ron ic! and !e back ic! o& a rerogressi)e la %inding is '. H& !e &ron ic! is '1# %!a is !e back ic!+ 5elec one< a. '1." b. '1 c. '/ Correc d. 19 =eedback 8!e correc ans%er is< '/ Queston 1( Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8%o searael2 excied dc s!un generaors are conneced in arallel and carr2 a oal load curren o& "(( ameres. eneraor A !as an armaure resisance o& (.(/ o!m and is generatng a )olage o& '/( )ols. ene raor B !as an armaure resisance o& (.(4 o!m and is generatng a )olage o& '/( )ols also. Calculae !e erminal )olage. 5elec one< a. '1(."( )ols b. '/( )ols Hncorrec c. '1".", )ols d. ''1.44 )ols =eedback 8!e correc ans%er is< ''1.44 )ols Queston 11 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A s!or0s!un comound generaor deli)ers a load curren o& "( A a a erminal )olage o& '"( )ols. 8!e armaure# series Ield# s!un Ield resisances are (.(" o!m# (.(/ o!m and '"( o!ms resect)el2. *!a is !e generaed em& o& !e mac!ine+ 5elec one< a. '"( b. ' "4.(" Correc c. ',(.4" d. '"7./4 =eedback 8!e correc ans%er is< '"4.(" Queston 1' Correc Mark 1.(( ou o& 1.(( o Tag ged=lag ueston Queston ex A "( 6:# 44( # /0!ase# ,( 6# ,0ole suirrel cage inducton moor is oeratng a &ull0load and (. &. 8!e &ull0load e3cienc2 is "$ and !e ercenage sli is "$. -eermine !e &ull0load orue. 5elec one< a. /'/.'4 0m b. '14."" 0m c. '(,.7' 0m d. /1'.47 0m Correc =eedback 8!e correc ans%er is< /1'.47 0m Queston 1/ Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e namelae ratng o& a s!un moor is 1"( !# ,(( )ols# '(" A# 17(( rm. 8!e resisance o& !e s!un Ield circui is '4( o!ms and !e oal armaure circui resisance is (.1" o!m. Calculae !e seed regulaton o& !e moor. 5elec one< a. 4.(7$ b. 4.9$ c. ".'"$ d. ".1$ Correc =eedback 8!e correc ans%er is< ".1$ Queston 14 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A "( kA# '/((K'/( )ols# ,( c2cle rans&ormer is esed in !e laboraor2 so !a is c!araceristcs ma2be deermined. 8!e sandard es reuires an oen circui es and s!or circui es. Oen Circui 8es< H > ,." A# E > '/( # : > 17 * 5!or Circui 8es< H > '1.7 A# E > 11" # : > "7( *. -eermine !e e3cienc2 o& !e rans&ormer a !al& load# uni2 &. 5elec one< a. 9.4"$ b. 9.7($ Correc c. 97.($ d. 97.""$ =eedback 8!e correc ans%er is< 9.7($ Queston 1" Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A searael2 excied moor a 1(4" rm# %i! a consan Ield curren# %!ile aking an armaure curren o&
"( A a 1'( . !e armaure resisance is (.1 o!m. H& !e load on !e moor c!anges suc! !a i no% akes 9" A a 1'( # deermine !e moor seed a !e load. 5elec one< a. 994 rm Hncorrec b. 1(14 rm c. 11(4 rm d. 1((4 rm =eedback 8!e correc ans%er is< 1((4 rm Queston 1, Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ,., k# 0conneced s2nc!ronous moor !as a s2nc!ronous reacance er !ase o& 1( o!ms and a negligible resisance. =or a cerain load# !e moor dra%s 99( k* a normal )olage. A !is load# !e induced em& er !ase is "1,( . -eermine oeratng &. 5elec one< a. (."1 b. (.4,' c. (.47 Correc d. (."(' =eedback 8!e correc ans%er is< (.47 Queston 17 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex An induct)e load consumes 1( k* a (.7" & lagging. A s2nc!ronous moor %i! a & o& (.9 leading is conneced in arallel %i! !e induct)e load. *!a is !e minimum reuired k* sie o& !e s2nc!ronous moor so !a !e combined load %ill !a)e a & o& (. lagging+ 5elec one< a. 1.1(9 k* b. 1.(, k* Correc c. 1.(7" k* d. 1.'(/ k* =eedback 8!e correc ans%er is< 1.(, k* Queston 1 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A Ball Mill roor is raed 7"(0!# 4,( )ols line o line# ,( 6# (." o%er &acor lagging and (.9" e3cienc2. 5ol)e &or !e raed curren. 5elec one< a. 9(( ams b. 7( ams c. 7( ams Correc d. 99( ams =eedback 8!e correc ans%er is< 7( ams Queston 19 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A 44( )ol s!un moor !as an armaure resisance o& (. o!m and Ield resisance o& '(( o!ms. *!a is !e armaure o%er de)eloed %!en gi)ing an ouu o& 7.4, k* a "$ e3cienc2+ 5elec one< a. 7.4, k* b. 7.", k* c. .4, % Hncorrec d. 7.'/k* =eedback 8!e correc ans%er is< 7.", k* Queston '( Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex An oen dela bank is ser)ing a !ree0!ase roar2 con)erer. 8!e con)erer sulies 17" A o& curren o 1.4 o!m dc resist)e load. H& !e mac!ine dra%s an AC curren o& 1(( A a (. & lagging# deermine minimum sie o& rans&ormer needed. 5elec one< a. 1".( kA Correc b. 19.4 kA c. '".9 kA d. '4.7 kA =eedback 8!e correc ans%er is< 1".( kA Queston '1 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A long s!un comound moor akes a curren o& 4' A &rom a '/( source. Armaure# series Ield and s!un Ield resisances are (.1 o!m# (.' o!m and "( o!ms resect)el2. H& !e &ricton and %indage losses amoun o 4(( *# deermine !e o)er0all e3cienc2 o& !e mac!ine. 5elec one< a. 1.''$ b. (.""$ Correc c. '.'4$ d. 79."/$ =eedback 8!e correc ans%er is< (.""$ Queston '' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8%o s!un generaors running in arallel deli)ers a oal curren o& /#,(( A. Eac! mac!ine !as a Ield resisance o& ,( o!ms and an armaure resisance o& (.(1 o!m. 8!e em&s generaed b2 eac! mac!ine are 4"" and 4,( # resect)el2. Calculae !e k* s!are o& eac! mac!ine. 5elec one< a. ,' k*# 1("7 k* Hncorrec b. ,41 k*# 1(9 k* c. ,7( k*# 1(,9 k* d. ,"' k*# 1(7 k* =eedback 8!e correc ans%er is< ,"' k*# 1(7 k* Queston '/ Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '((0kA rans&ormer !as an imedance o& 1"$ and !e o%er &acor o& !e load is "$. 8!e rimar2 )olage is ,#((( )ols %!ile !e coer loss is 1" k*. =ind !e ercenage )olage regulaton. 5elec one< a. 1/.49$ Correc b. .91$ c. '/.,7$ d. 1".7$ =eedback 8!e correc ans%er is< 1/.49$ Queston '4 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A generaor a no0load oeraes ,1 6# sloe 1 M*K6. \oad 1 > 1.( M* and load ' > (. M* are conneced. =ind !e &reuenc2 be&ore and a?er adding !e load '. 5elec one< a. ,( 6 am "9./ 6 b. ,( 6 am "9 6 Hncorrec c. ,( 6 am "9.' 6 d. ,( 6 am "9.1 6 =eedback 8!e correc ans%er is< ,( 6 am "9.' 6 Queston '" Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex -eermine !e seed in rm o& !e moor a &ull load %i! !e &ollo%ing circui elemens er !ase< Roor leakage reacance > (.,"# 5aor leakage reacance > 1.1'# Roor resisance > (.1(# 5aor resisance > (.'"# Connecton > 0. 8!is moor is "(( 6:# /0!ase# ''(( )ol# ,(0c2cle# ,0 ole inducton moor %i! additonal core loss o& '#((( %a@s and !e &ricton and %indage losses oal is 1(#((( %a@s. 5elec one< a. 119( rm Correc b. 1'(( rm c. 119, rm d. 11 rm =eedback 8!e correc ans%er is< 119( rm Queston ', Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A s!or s!un comound dc generaor deli)ers a load curren o& /( A a ''( and !as armaure# series Ield and s!un Ield resisances o& (.(" o!m# (.(/
o!m# and '(( o!ms resect)el2. Calculae !e generaed )olage allo% 1 &or brus! conac droP. 5elec one< a. ''1.(" b. /(1.", c. ''/.4" Correc d. '9".' =eedback 8!e correc ans%er is< ''/.4" Queston '7 Correc Mark 1.(( ou o& 1.(( o Tag ged=lag ueston Queston ex 8!e )olage o& a 1((0k*# '"(0)ol s!un generaor rises o ',( )ols %!en !e load is remo)ed. *!a is !e &ull0load curren does !e mac!ine deli)er# and %!a is is ercen regulaton+ 5elec one< a. 4(( A# 4$ Correc b. "(( A# "$ c. 4(( A# '$ d. /" A# /."$ =eedback 8!e correc ans%er is< 4(( A# 4$ Queston ' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 91.7$ b. 9'.1/$ Hncorrec c. 94.("$ d. 9/.7/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston '9 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '( k*# '((0 s!un generaor is oeraed a raed load. H& !e dri)ing engine is de)eloing /( !# deermine !e iron and &ricton losses. Armaure resisance is (.(" o!m and s!un Ield resisance is "( o!ms. 5elec one< a. 9"4 * b. 1(/4 * Hncorrec c. 1(/9 * d. 1/4( * =eedback 8!e correc ans%er is< 1(/9 * Queston /( Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex *!en a 0 s2sem is con)ered ino a dela0dela s2sem# increase in a caaci2 o& !e s2sem is ercen. 5elec one< a. ,,.7 b. 7/.' Correc c. "( d. ,., =eedback 8!e correc ans%er is< 7/.' Queston /1 Correc Mark 1.(( ou o& 1.(( o Tag ged=lag ueston Queston ex A s!un moor %as esed b2 means o& a ron20brake !a)ing a leng! o& arm o& /." &ee and a are %eig! /.7 ounds. 8!e curren dra%n b2 !e mac!ine &rom a '4(0)ols line %as "(.9 ameres %!en !e scale reading on !e brake %as '4.( ounds and !e seed o& !e moor %as 1#1(/ rm. 8!e resisance o& !e armaure including !e brus!es is (.' o!m and !a o& !e s!un Ield is ',"." o!m. Assume ')ol dro across !e brus!esP. Calculae !e e3cienc2 under !e consideraton o& !e es. 5elec one< a. ".91$ b. 91.11$ Correc c. 9.41$ d. 94.7/$ =eedback 8!e correc ans%er is< 91.11$ Queston /' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance o o!mic resisance is 1.". 8!e o!mic resisance is obained b2 connectng %o erminals o a d.c source. 8!e curren )olage are 7., Ameres and , )ols resect)el2. *!a is !e ercen resisance+ 5elec one< a. 1 Hncorrec b. ' c. 4.' d. / =eedback 8!e correc ans%er is< / Queston // Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance is 1." tmes !e o!mic resisance. 8!e o!mic resisance is obained b2 connectng %o erminals o a -C source. 8!e curren and )olage are 7., A and , resect)el2. *!a is !e eect)e resisance er !ase+ 8!e generaor is %2e0conneced. 5elec one< a. (./4' o!m b. (.(," o!m c. (.("1/ o!m Correc d. (.(,17 o!m =eedback 8!e correc ans%er is< (.("1/ o!m Queston /4 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e :8s o& a ''( k ransmission line !a)e a rato o& 1/'.7, kK,,./7" are conneced %2e0%2e. A )olmeer conneced line o ground reads ,, )ols# %!a is !e ransmission line )olage+ 5elec one< a. ''".'" k b. ''.,/ k Correc c. ''/.1" k d. ''(.1( k =eedback 8!e correc ans%er is< ''.,/ k Queston /" Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex H& load angle o& a 4 ole s2nc!ronous moor is degrees elecricalP# is )alue in mec!anical degree is . 5elec one< a. 4 Correc b. ' c. (.'" d. (." =eedback 8!e correc ans%er is< 4 Queston /, Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A seed0indicatng de)ice consiss o& a '0ole ermanen magne -C generaor %i! a '(((0o!ms -C )olmeer conneced across is erminals. 8!e generaor !as an armaure %i! 1'(( conducors !a)ing %o arallel a!s and a oal resisance o& 1((( o!ms be%een brus!es. 8!e air ga Tux is 4(#((( lines er ole. H& !e )olmeer reads 1( # a %!a seed i %ill !is reading indicaes+ 5elec one< a. 1",' rm b. 1"1' rm Hncorrec c. 1"/4 rm d. 1"' rm =eedback 8!e correc ans%er is< 1",' rm Queston /7 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e coer0loss and core0loss o& a rans&ormer o& a rans&ormer a )arious loads are as s!o%n belo%. A %!a load %ill !e e3cienc2 o& !e rans&ormer be a maximum+ 5elec one< a. \oad > '( kA# Core loss > /'( *# Coer \oss > ( * b. \oad > 4( kA#
Core loss > /'( *# Coer \oss > /'( * Correc c. \oad > "( kA# Core loss > /'( *# Coer \oss > "(( * d. \oad > /( kA# Core loss > /'( *# Coer \oss > 1( * =eedback 8!e correc ans%er is< \oad > 4( kA# Core loss > /'( *# Coer \oss > /'( * Queston / Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ''(0 s!un moor deli)ers 4( ! on &ull0load a 9"( rm and !as an e3cienc2 o& $. 8!e armaure and Ield resisances are (.' o!m and 11( o!ms# resect)el2. -eermine !e sartng resisance suc! !a !e sartng armaure curren does no exceed 1., tmes !e &ull0load curren. 5elec one< a. (.71' o!m b. (.7/' o!m c. (.7(4 o!m Correc d. (.7/9 o!m =eedback 8!e correc ans%er is< (.7(4 o!m Queston /9 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A !ree0!ase alernaor !as , slos e r ole er !ase. -eermine !e disributon &acor. 5elec one< a. (.977 b. (.94 c. (.9", Correc d. (.9,/ =eedback 8!e correc ans%er is< (.9", Queston 4( Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A !ree0!ase roar2 con)erer deli)ers 1"( A a "(( dc. -eermine !e curren on !e AC side i& !e oeratng o%er &acor o& !e mac!ine is (. and !e e3cienc2 is 9($ 5elec one< a. 1 "7 A Hncorrec b. 19 A c. 179 A d. 19, A =eedback 8!e correc ans%er is< 19, A Queston 41 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ,( MA# ,9./0k# !ree !ase s2nc!ronous generaor !as a s2nc!ronous reacance o& 1" o!ms er !ase and negligible armaure resisance. 8!e generaor is deli)ering rae o%er a ($ o%er &acor lagging a raed erminal )olage o an inInie bus0bar. H& !e generaed em& is /, k er !ase# %!a is !e maximum !ree !ase o%er !a !e generaor an deli)er be&ore losing is s2nc!ronism. 5elec one< a. /'( M* b. 9, M* Hncorrec c. ' M* d. 1'( M* =eedback 8!e correc ans%er is< ' M* Queston 4' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A d.c. moor de)elos a orue o& '(( 0m a '" rs. A '( rs# i %ill de)elo a orue o& 0m. 5elec one< a. '(( b. 1' Hncorrec c. '"( d. 1,( =eedback 8!e correc ans%er is< '(( Queston 4/ Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( )ols. 8!e armaure resisance is (.(,1 o!m. *!a is !e armaure curren+ 5elec one< a. 91." Ameres b. 9,.1" Ameres c. 9".1 Ameres Hncorrec d. 9.1" Ameres =eedback 8!e correc ans%er is< 9.1" Ameres Queston 44 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e rato o& !e rimar2 o secondar2 )olage o& a rans&ormer is ' (.1" o!m 5elec one< a. '#49, )ols b. '#,/' )ols c. '#"7" )ols d. '#4"( )ols =eedback 8!e correc ans%er is< '#49, )ols Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e dierence be%een !e &ron ic! and !e back ic! o& a rerogressi)e la %inding is '. H& !e &ron
ic! is '1# %!a is !e back ic!+ 5elec one< a. '/ b. '1 c. 19 d. '1." =eedback 8!e correc ans%er is< '/ Queston '7 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor deli)ers 19" A a a erminal )olage o& '"( . 8!e armaure resisance and !e s!un Ield resisance are (.(' and (.(" o!m resect)el2. 8!e iron and !e &ricton losses are eual o 9"( *. =ind !e mec!anical e3cienc2. 5elec one< a. 9.'$ b. 97./"$ c. 9/."$ d. 9".9$ =eedback 8!e correc ans%er is< 9.'$ Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!m er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. Calculae !e maximum o%er !a can be de)eloed b2 !e alernaor a !is exciaton. 5elec one< a. 11 M* b. 9. M* c. 1( M* d. 1' M* =eedback 8!e correc ans%er is< 11 M* Queston '9 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A '(( kA rans&ormer !as an iron loss o& 1 k* and &ull0load Cu loss o& ' k*. Hs load kA corresonding o maximum e3cienc2 is kA. 5elec one< a. '(( b. 141.4 c. 1(( d. "( =eedback 8!e correc ans%er is< '(( Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An inducton moor o& /(0!# ''(0)ols# /0!ase dra%s 4"( ercen o& !e raed curren %i! !e raed )olage and deli)ers during !e sartng eriod 1/( ercen o& !e raed orue. 8!e &ull0load e3cienc2 and &ull0load o%er &acor o& !is moor is ($ and 7($ resect)el2. H& an auorans&ormer is used as a sartng uni and sartng orue o& !e load is onl2 "( ercen o& !e raed orue o& !e moor# Ind !e sartng )olage and sartng curren o& !e line. 5elec one< a. 17.9( )ols and '., ams b. 1/,.44 )ols and '9'.7 ams c. '4".7 )ols and /(1.4 ams d. ''( )ols and ''7./ ams =eedback 8!e correc ans%er is< 1/,.44 )ols and '9'.7 ams Queston /1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& an alernaor %inding !as a &ractonal ic! o& "K,# !e coil san is degrees. 5elec one< a. /( b. 1"( c. ,( d. /(( =eedback 8!e correc ans%er is< 1"( Queston /' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '(0k* ''(0)ols s!un generaor !as an armaure resisance o& (.(7 o!m and a s!un resisance o& '(( o!ms. -eermine !e o%er de)eloed in !e armaure %!en i deli)ers is raed ouu. 5elec one< a. '".7 k* b. '(./ k* c. '7.9 k* d. 19.' k* =eedback 8!e correc ans%er is< '(./ k* Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,0ole# "(0 6# /0!ase inducton moor is running a 9"( rm and !as roor Cu loss o& " k*. Hs roor inu is k*. 5elec one< a. "./ b. 1(( c. 9" d. 1( =eedback 8!e correc ans%er is< 1(( Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A " !# /0!ase moor dra%s curren %!en conneced o '/( . -eermine !e curren dra%n b2 !e moor i& !e o%er &acor is (.9( and e3cienc2 o& /$. 5elec one< a. 1'."/ A b. 1/.'" A c. 1 ".1/ A d. 14.(" A =eedback 8!e correc ans%er is< 1'."/ A Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A es is er&ormed on a '/( )ols# dela conneced s2nc!ronous moor !a)ing 9'$ e3cienc2 and "$ o%er &acor. *i! , )ols dc imressed across is erminals# !e curren reading is 9 ( ameres. -eermine !e o!mic resisance er !ase. 5elec one< a. (.1" o!mK!ase b. (.1 o!mK!ase c. (.44 o!mK!ase d. (.(,7 o!mK!ase =eedback 8!e correc ans%er is< (.1 o!mK!ase Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e rato o& !e rimar2 o secondar2 )olage o& a rans&ormer is ' /'( *# Coer \oss > "(( * b. \oad > /( kA# Core loss > /'( *# Coer \oss > 1( * c. \oad > 4( kA# Core loss > /'( *# Coer \oss > /'( * d. \oad > '( kA# Core loss > /'( *# Coer \oss > ( * =eedback 8!e correc ans%er is< \oad > 4( k A# Core loss > /'( *# Coer \oss > /'( * Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "( MA# '/(kK/4."k %2e grounded auorans&ormer carries a /0!ase unbalanced load. H& !e rimar2 ground curren is 1( cis /( deg# %!a is !e secondar2 ground curren+ 5elec one< a. ,,.7 cis /o deg. b. ,,.7 cis 0/( deg.P c. 1( cis /( deg. d. ",.7 cis /( deg. =eedback 8!e correc ans%er is< ,,.7 cis /o deg. Queston 49 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 6o% man2 arallel a!s does a ,0ole rilex la0%ound conneced armaure %inding o& a dc generaor !a)e+ 5elec one< a. , b. / c. 1 d. 1' =eedback 8!e correc ans%er is< 1 Queston "( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e roor o& a ''( # ,( 6# 40ole inducton moor !as a o%er inu o& ( k* is obser)ed !a !e roor em&
makes 9( c2cles er minue. Calculae !e roor coer loss. 5elec one< a. ' k* b. 4 k* c. " k* d. / k* =eedback 8!e correc ans%er is< ' k* 5HHA A 1(( MA 1( k urbo0alernaor !as a curren limitng reacor o& (.1,' o!ms in is neural. 8!e er uni )olage o& !e reacor reacance based on !e generaor ratng is 5elec one< a. (.(" b. (." c. (.'" d. (.('" =eedback 8!e correc ans%er is< (.(" Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o 1"(( kA ac generaors running in arallel sulies !e oal load o& ''"( k* a (.9( .& lagging. One mac!ine is loaded o 1((( k* a (." .&. lagging. *!a is !e kA and .& o& !e o!er mac!ine+ 5elec one< a. 1//" am (.94 lagging b. 17"( am (. lagging c. 1'"( am (.7 lagging d. 47( am (.9 lagging =eedback 8!e correc ans%er is< 1//" am (.94 lagging Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A iece o& conducor 1( cm long mo)es across a magnetc Ield o& 1(#((( gauss a a )eloci2 o& 1'( cmKsec. *!a )olage aears across !e conducor+ 5elec one< a. 1'( b. (.'4 c. ,( d. (.1' =eedback 8!e correc ans%er is< (.1' Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase sar conneced AC generaor is raed a '." MA# 11 k# ,( 6. 8!e generaor !as a negligible resisance and a s2nc!ronous reacance o& '( o!ms er !ase. 8o %!a )alue %ill !e erminal )olage rise %!en &ull load a ($ & lagging is s%ic!ed0o+ 5elec one< a. 1"./ k b. 14.' k c. 1/." k d. 1'.7 k =eedback 8!e correc ans%er is< 14.' k Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1 '( . 8!e armaure e3cienc2 is 9"$. *!a is !e back em&+ 5elec one< a. 1'' )ols b. 114 )ols c. 11 )ols d. 117 )ols =eedback 8!e correc ans%er is< 114 )ols Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!en alied raed )olage er !ase is reduced b2 one0!al&# !e sartng orue o& a 5CHM becomes o& !e sartng orue %i! &ull )olage. 5elec one< a. /f1K'PK' b. 1K4 c. 1K'f1K'P d. 1K' =eedback 8!e correc ans%er is< 1K4 Queston 7 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex H& !ree rans&ormers in a dela0dela are deli)ering !eir raed load and one rans&ormer is remo)ed# !en o)erload and eac! o& !e remaining rans&ormer is ercen. 5elec one< a. 7/.' b. ,,.7 c. " d. 17/.' =eedback 8!e correc ans%er is< 7/.' Queston Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 44( )ol 7" ! s!un moor !as an armaure resisance o& (.1" o!m and a Ield resisance o& /"( o!ms. 8!e curren dra%n a &ull load is 1/" ameres. *!a is !e back em& in )ols+ 5elec one< a. 41"./ b. /94. c. /9./ d. 417.1 =eedback 8!e correc ans%er is< 41"./ Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dela0conneced load inducton moor dra%s 1(( A &rom eac! line o& a !ree0!ase source and de)elos 4( lb0? orue a sandstll. =ind !e orue %!en conneced o !e same source i& !e moor is reconneced in %2e. 5elec one< a. 1/./ lb0? b. 4( lb0? c. 1'( lb0? d. none o& !ese =eedback 8!e correc ans%er is< 1/./ lb0? Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A series moor# !a)ing an armaure resisance o& (.1 o!m and a Ield resisance o& (.1" o!m# akes 4 A a '/( and 7'( rm. 8!e oal core and &ricton losses are ,"( *# neglectng sra20load and brus!0conac losses# calculae ouu o%er a !e s!a?. 5elec one< a. 11./, 6: b. 1,.1/ 6: c. 11/., 6: d. 1/.1, 6: =eedback 8!e correc ans%er is< 1/.1, 6: Queston 11 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4#4(( )ol# ,( 6 rans&ormer !as a core loss o& 4( *a@s# o& %!ic! one0!ird is edd20curren loss. -eermine !e core loss o& !is rans&ormer %!en i is conneced o a 4#,(( ols# "( 6. 5elec one< a. 779 *a@s b. 977 *a@s c. 79 *a@s d. ,79 *a@s =eedback 8!e correc ans%er is< 977 *a@s Queston 1' Correc Mark 1.(( ou o& 1.(( Remo)e Tag Queston ex A !ree0 !ase AC generaor is sul2ing o%er o a load o& /'(( k* a '/( )ols and a o%er &acor o& ,($. Assume !a !e loss o& !e line# !e generaor armaure and !e load is eual o !e 1($ o& !e load# %!a %ould be !e sa)ings in %a@s i& !e o%er &acor %ere raised o ($+ 5elec one< a. '/(#((( b. 1((#((( c. (#((( d. 14(#((( =eedback 8!e correc ans%er is< 14(#((( Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4(( series moor !as a Ield resisance o& (.' o!m and an armaure resisance o& (.1 o!m. 8!e moor akes /( A o& curren a 1((( rm %!ile de)eloing &ull0load orue. *!a is !e moor seed %!en !is moor de)elos ,($ o& &ull load orue+ 5elec one< a. 11/"." rm b. 1'"7.' rm c. 1'97., rm d. 1/('.4 rm =eedback 8!e correc ans%er is< 1'97., rm
Queston 14 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 40ole# "( 6 inducton moor oeraes a "$ sli. 8!e &reuenc2 o& em& induced in !e roor %ill be 5elec one< a. '." 6 b. '" 6 c. none o& !ese d. "( 6 =eedback 8!e correc ans%er is< '." 6 Queston 1" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An ( k*# 44( )ols# /0!ase# 0conneced# ,( 6# 40ole s2nc!ronous moor !as a s2nc!ronous reacance o& /0o!m er !ase. Calculae !e orue in e%on0meer i& i is oeratng a raed conditon a 9'$ e3cienc2. 5elec one< a. 4,1 b. 1/" c. "71 d. 714 =eedback 8!e correc ans%er is< 4,1 Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An auorans&ormer !a)ing a rans&ormaton rato o& (. sulies a load o& / k*. 8!e o%er rans&erred conduct)el2 &rom rimar2 o secondar2 is k*. 5elec one< a. (., b. 1." c. (.'7 d. '.4 =eedback 8!e correc ans%er is< '.4 Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a 4 ole# "4 slo d.c. armaure# calculae !e coil san. 5elec one< a. 1/ b. 14 c. 9 d. 1 =eedback 8!e correc ans%er is< 1/ Queston 1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Calculae !e e3cienc2 o& a '((0# 1((0k* s!un generaor i& !e resisance o& !e armaure and s!un resect)el2 are (.((" o!m and '( o!ms. 8!e &ricton# %indage and iron losses oge!er amoun o /#((( *. 5elec one< a. 9".$ b. 9'.$ c. 9.($ d. 94.($ =eedback 8!e correc ans%er is< 94.($ Queston 19 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(( kA# 4(( )ol# % 2e conneced salien ole s2nc!ronous generaor runs a &ull load and ($ o%er &acor leading. H& [d > '[ > 1.1 er !ase and Ra is negligible# calculae !e )olage regulaton. 5elec one< a. 0'4,$ b. 0'4.,$ c. 0',.4$ d. 0,4.'$ =eedback 8!e correc ans%er is< 0',.4$ Queston '( H ncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o identcal s!un generaors running in arallel sul2 a oal load curren o& '"(( A. Eac! mac!ine !as a Ield resisance o& "( o!ms and an armaure resisance o& (.(1 o!m. 8!e induced em&s generaed are '/( and '/" )ols# resect)el2. Calculae !e common oeratng )olage o& eac! mac!ine. 5 elec one< a. ''/ b. ''( c. '1 d. ''' =eedback 8!e correc ans%er is< ''( Queston '1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor deli)ers 19" A a a erminal )olage o& '"( . 8!e armaure resisance and !e s!un Ield resisance are (.(' and (.(" o!m resect)el2. 8!e iron and !e &ricton losses are eual o 9"( *. =ind !e elecrical e3cienc2. 5elec one< a. 97./$ b. 9.'$ c. 9".9$ d. 9/."$ =eedback 8!e correc ans%er is< 9".9$ Queston '' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '" kA# single !ase rans&ormer !e core loss and &ull load coer loss are /'( and /( %a@s resect)el2. *!a is !e e3cienc2 a !al& load and (.,, o%er &acor+ 5elec one< a. 9,./$ b. 9"./$ c. 97.$ d. 94.7$ =eedback 8!e correc ans%er is< 9,./$ Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A seed0indicatng de)ice consiss o& a '0ole ermanen magne -C generaor %i! a '(((0o!ms -C )olmeer conneced across is erminals. 8!e generaor !as an armaure %i! 1'(( conducors !a)ing %o arallel a!s and a oal resisance o& 1((( o!ms be%een brus!es. 8!e air ga Tux is 4(#((( lines er ole. H& !e )olmeer reads 1( # a %!a seed i %ill !is reading indicaes+ 5elec one< a. 1"' rm b. 1"1' rm c. 1",' rm d. 1"/4 rm =eedback 8!e correc ans%er is< 1",' rm Queston '4 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex 8!e seed o& a moor0generaor se consistng o& a ,0ole inducton moor and a 4ole dc generaor &ed &rom a /0 !ase. 5elec one< a. 1"(( b. /((( c. ,(( d. 1((( =eedback 8!e correc ans%er is< ,(( Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# !e iron loss o& !e rans&ormer a raed )olage bu "( 6 %ould be %a@. 5elec one< a. 1(( b. ( c. ,4( d. 1.'" =eedback 8!e correc ans%er is< ,4( Queston ', Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex An eig! ole %ound roor inducton moor oeratng on ,( 6 sul2 is dri)en a 1(( r..m. b2 a rime mo)er in !e oosie directon o& re)ol)ing magnetc Ield. 8!e &reuenc2 o& roor curren is 5elec one< a. ,( 6 b. none o& !e abo)e c. 1'( 6 d. 1( 6 =eedback 8!e correc ans%er is< 1( 6 Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase# 0ole generaor is dela conneced. 8!e erminal )olage is '4(( %!ile !e line curren is "(( ameres. H& !e mac!ine is con)ered o %2e# %!a %ill be !e erminal )olage in )ols+ 5elec one< a. /(( b. 41"7 c. 4(( d.
4,(( =eedback 8!e correc ans%er is< 41"7 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An oen dela bank# consistng o& %o0single !ase rans&ormers is oeratng %i! balanced !ree0!ase load o& "( kA# 44( a (. & lagging and a single !ase load o& 1( k* resist)e conneced across c0a leg. -eermine !e minimum ratngs o& !e rans&ormers. Assume a !ase seuence o& a0b0c. 5elec one< a. /.( kA# /4.(, kA b. /4./' k A# //.4( kA c. /(./ kA# /9."' kA d. /".4 kA# /,./4 kA =eedback 8!e correc ans%er is< /.( kA# /4.(, kA Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A s2nc!ronous moor oeraes contnuousl2 on !e &ollo%ing du2 c2cle< "( ! &or 1( sec# 1(( ! &or 1( sec# 1"( ! &or " sec# 1'( ! &or '( sec# idling &or 14 sec. *!a %ould be !e sie o& moor o be used+ 5elec one< a. 1'( ! b. 9( ! c. 1(( ! d. 1"( ! =eedback 8!e correc ans%er is< 1(( ! Queston /( o ans%ered Marked ou o& 1 .(( =lag ueston Queston ex 8o ge !e armaure resisance o& a 1(( M*# 1/.9 k and 9($ o%er &acor generaor# %o erminals are conneced o a -C source. 8!e measured curren and )olage are 7., ameres and , )ols resect)el2. *!a is !e -C resisance er !ase+ 5elec one< a. (.(/4' o!m b. (.(''/ o!m c. (.(,17 o!m d. (.(," o!m =eedback 8!e correc ans%er is< (.(/4' o!m Queston /1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e losses in a ''( # !ree0!ase# '" 6# 40ole inducton moor a &ull0load are as &ollo%s< Core > /.($# =ricton and %indage > '.($# 5aor Cu loss > 4.($# Roor Cu loss > '.($# A 7($ o& &ull0load o& !e mac!ine# deermine is seed and e3cienc2 5elec one< a. 74( rm and 9.1$ b. 1#'(( rm and 9.1$ c. 1#(( rm and 7.9/$ d. 1#17( rm and .7$ =eedback 8!e correc ans%er is< 74( rm and 9.1$ Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex As comared o dela0dela bank# !e caaci2 o& !e 0 bank o& rans&ormers is ercen. 5elec one< a. ,., b. ,,.7 c. "7.7 d. "( =eedback 8!e correc ans%er is< "7.7 Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "(0k*# '"(0 s!or0s!un comound generaor !as !e &ollo%ing daa< Ra > (.(, o!m# Rse > (.(4 o!m and R& > 1'" o!ms. Calculae !e induced armaure )olage a raed load and erminal )olage. 8ake ' as !e oal brus!0conac dro. 5elec one< a. ',.'4 b. '74.1' c. '7(.1' d. '7'.1' =eedback 8!e correc ans%er is< '7'.1' Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind unloaded ouu o& a o%er sul2 !a)ing a rans&ormer regulaton o& 11.1($ and 9(( load ouu. 5elec one< a. 9( b. 9(( c. 99.99 d. 999.9 =eedback 8!e correc ans%er is< 999.9 Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e lo% side o& a cerain %elding rans&ormer !as ' urns and deli)ers /(( A. H& !e !ig! )olage side !as /( urns# !o% muc! curren lo%s !roug! i+ 5elec one< a. '( A b. 1' A c. 1" A d. 1( A =eedback 8!e correc ans%er is< '( A Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A single0!ase roar2 con)erer !as an ouu )olage o& 11( )ols. -eermine !e line curren in !e AC side %!en !e mac!ine deli)ers a -C ouu o& "( A. Assume !e mac!ine is oeratng %i! a & o& (." and e3cienc2 o& 9"$. 5elec one< a. '.'/ A b. 9(./4 A c. 7."7 A d. 7(.71 A =eedback 8!e correc ans%er is< 7."7 A Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e )olage o& a 1((0k*# '"(0)ol s!un generaor rises o ',( )ols %!en !e load is remo)ed. *!a is !e &ull0load curren does !e mac!ine deli)er# and %!a is is ercen regulaton+ 5elec one< a. 4(( A# '$ b. 4(( A# 4$ c. "(( A# "$ d. /" A# /."$ =eedback 8!e correc ans%er is< 4(( A# 4$ Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A -C s!un moor !as a &ull load ratng o& 1" !# '/( )ols# "7.1 ameres# 14(( rm. 8!e armaure circui resisance is (.1/ o!m and !e Ield circui resisance is 11" o!ms. eglectng !e eec o& armaure reacton# deermine !e no0load seed. 5elec one< a. 1/( rm b. 1441 rm c. 1 ',4 rm d. 1/9' rm =eedback 8!e correc ans%er is< 1441 rm Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 40ole# 1'0slo la %ound d.c. armaure !as ' coil sidesKslo. Assuming single urn coils and rogressi)e %inding# !e back ic! %ould be 5elec one< a. / b. 7 c. , d. " =eedback 8!e correc ans%er is< 7 Queston 4( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum o%er !a can be roduced. 5elec
one< a. 1' M* b. 9. M* c. 1( M* d. 11 M* =eedback 8!e correc ans%er is< 11 M* Queston 41 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc series moor de)ice 1( lbs.0? o& orue %!en !e curren is /( Am. 8!e load increased so !a !e moor curren rises o "( Am. 8!e orue no% is 5elec one< a. 1( lbs.0? b. ,4. lbs.0? c. "(( lbs.0? d. /(( lbs.0? =eedback 8!e correc ans%er is< "(( lbs.0? Queston 4' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( )ols. 8!e armaure resisance is (.(,1 o!m. *!a is !e armaure curren+ 5elec one< a. 9".1 Ameres b. 9,.1" Ameres c. 9.1" Ameres d. 91." Ameres =eedback 8!e correc ans%er is< 9.1" Ameres Queston 4/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A , ole la %ound s!un moor akes /(( A %!en !e seed is "(( rm. 8!e Tux er ole is (.(, *b and !e armaure !as a 7( conducors. eglectng !e s!un Ield curren# calculae !e ouu !orseo%er o& !e moor. Assume a consan loss o& 4$. 5elec one< a. 1," ! b. 17" ! c . 1, ! d. 17' ! =eedback 8!e correc ans%er is< 1, ! Queston 44 Hncorrec Mark (.(( ou o& 1.(( = lag ueston Queston ex A s!un generaor sulies a load o& "#"(( * a 11( !roug! a air o& &eeder conducors !a)ing a resisance o& (.(' o!m eac!. 8!e armaure# s!un Ield resisances are (.1" o!m and "( o!ms resect)el2. =ind !e em& generaed. 5elec one< a. 1'( b. 11 c. 119 d. 1'1 =eedback 8!e correc ans%er is< 1'( Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex *!a is !e ercen sli o& a 40ole inducton moor i& !e ouu seed is 1#7"" rm+ 5elec one< a. / b. " c. 4 d. '." =eedback 8!e correc ans%er is< '." Queston 4, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un moor dra%s curren o& 4( A &rom a 1'( source and runs a 1'(( rm a raed load. 8!e armaure and Ield circui resisances are (.1 o!m and ,( o!ms# resect)el2. -eermine !e seed o& !e moor a !al& load. Assume a brus! dro o& ' raed load and 1 !al& load. 5elec one< a. 1(', rm b. 1'/ rm c. 1'/( rm d. 11( rm =eedback 8!e correc ans%er is< 1'/( rm Queston 47 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e seed a %!ic! a ,0ole alernaor s!ould be dri)en o generaor "( c2cles er second is 5elec one< a. none o& !ese b. 1#"(( rm c. 1#((( rm d. "(( rm =eedback 8!e correc ans%er is< 1#((( rm Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a 5co@0connecton# calculae !e )alues o& !e line currens in Ameres on !e //(( )ols /0!ase side i& !e load on !e '0!ase are bo! /(( k* a 1(( ol and 7(.7$ lagging .&. 5elec one< a. ".7 b. 14." c. 1"7.' d. 14".' =eedback 8!e correc ans%er is< 14." Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A d.c. s!un moor de)elos 7. ! a 1'( )ol# !e armaure e3cienc2 is 9/$. *!a is !e armaure eect)e resisance+ 5elec one< a. (.(" o!m b. (.(, o!m c. (.1 o!m d. (.1, o!m =eedback 8!e correc ans%er is< (.1, o!m Queston "( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A /0!ase# 0ole dela conneced generaor !as a line curren o& "(( ameres. H& con)ered in %2e# %!a is !e olerable curren+ 5elec one< a. '.7 A b. '4".1 A c. /71." A d. /1".' A =eedback 8!e correc ans%er is< '.7 A Queston 1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '4( )ol d.c. moor on brake es ook "' Am %!en running a 1"(( rm. 8!e sring balance a !e end o& !e 7, cm brake arm reads 9/." . *!a is !e e3cienc2 o& !e moor a !is load+ 5elec one< a. (." b. (., c. (.9( d. (.9" =eedback 8!e correc ans%er is< (.9( Queston ' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un moor %i! armaure resisance o& (.1' o!m and designed o oerae a 11" # is aking ,( A in armaure curren a &ull0load. -eermine !e )alue o& !e exernal resisance o be insered in !e armaure circui so !a !e armaure curren s!all no exceed %ice is &ull0load )alue a sartng. 5elec one< a. (./ o!ms b. (.7 o!ms c. (./ o!ms d. (.( o!ms =eedback 8!e correc ans%er is< (./ o!ms Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 40ole# 1'0slo la %ound d.c. armaure !as ' coil sidesKslo. Assuming single urn coils and rogressi)e %inding# !e back ic! %ould be 5elec one< a. , b. / c. " d. 7 =eedback 8!e correc ans%er is< 7 Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "(0k*# '"(0 s!or0s!un comound generaor !as !e &ollo%ing daa< Ra > (.(, o!m# Rse > (.(4 o!m and R& > 1'" o!ms. Calculae !e induced armaure )olage a raed load and erminal )olage. 8ake ' as !e oal brus!0conac dro. 5elec one< a. '74.1' b. '7'.1' c. ',.'4 d.
'7(.1' =eedback 8!e correc ans%er is< '7'.1' Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase inducton moor is %ound &or 4 oles and is sulied &rom a "( 6 s2sem. *!a is !e roor &reuenc2 %!en roor runs a 141( rm+ 5elec one< a. / 6 b. /." 6 c. '.9 6 d. '." 6 =eedback 8!e correc ans%er is< / 6 Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e secondar2 curren o& a '( kK7.970k auorans&ormer is 1(( ameres. -eermine !e curren !a To%s !roug! !e common %inding. 5elec one< a. 1(( ameres b. "( ameres c. 7( ameres d. ,( ameres =eedback 8!e correc ans%er is< ,( ameres Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An AC suirrel cage inducton moor !as a seed ratng o& 1#7"( rm. H& !e leads are suc! !a !e2 could be reconneced &or conseuen %inding# %!a %ould be !e resultng seed+ 5elec one< a. /#"(( rm b. 7" rm c. /#4"( rm d. 1#7( rm =eedback 8!e correc ans%er is< 7" rm Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e inu and ouu o%ers o& a ''( # s!un moor are /( and ' k* resect)el2. 8!e Ield and armaure circui resisances are 4( o!ms and (.(1'" o!m resect)el2. -eermine !e e3cienc2 o& !e moor i& !e ouu o%er is reduced o 1( k*. 5elec one< a. .,7$ b. /.",$ c. ,.4$ d. 4.9/$ =eedback 8!e correc ans%er is< 4.9/$ Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '(( # 1( A moor could be re%ound &or 1(( # '( A b2 using as man2 urns er coil o& %aer !a)ing cross0sectonal area. 5elec one< a. %ice# !al& b. !al&# %ice c. &our tmes# one0&our! d. !rice# one0!ird =eedback 8!e correc ans%er is< !al&# %ice Queston 1( H ncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(0!# '/(0 s!un moor akes a &ull0load line curren o& 4( A. !e armaure and Ield resisances are (.'" o!m and '/( o!ms# resect)el2. 8!e oal brus!0conac dro is ' and !e core and &ricton losses are /( *. calculae !e e3cienc2 o& !e moor. Assume !a sra20load loss is 1$ o& ouu. 5elec one< a. /."$ b. 7.,$ c. 9,.4$ d. 7.,$ =eedback 8!e correc ans%er is< 7.,$ Queston 11 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e core loss o& a " kA single0!ase rans&ormer %i! normal )olage alied o !e rimar2 is 7" %a@s. 8!e maximum e3cienc2 occurs a ,($ o& &ull0load kA. *!a is !e &ull0load e3cienc2 o& !e rans&ormer a (.( o%er &acor+ 5elec one< a. 91./,$ b. 9/./$ c. 9."'$ d. 9".1,$ =eedback 8!e correc ans%er is< 9/./$ Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& Cu loss o& a rans&ormer a 7K! &ull0load is 49(( *# !en is &ull0load Cu loss %ould be %a@. 5elec one< a. /7" b. ,4(( c. ",(( d. 4'9 =eedback 8!e correc ans%er is< ,4(( Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& a 40ole inducton moor !as a s2nc!ronous seed o& 1"(( rm# !en sul2 &reuenc2 is 5elec one< a. none o& !ese b. '" 6 c. ,( 6 d. "( 6 =eedback 8!e correc ans%er is< "( 6 Queston 14 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A comound d2namo sulies a load o& '( k* a 4(( !roug! a &eeder !a)ing a resisance eual o (.1 o!m. 8!e s!un and series Ield resisances are " o!ms and (.(, o!m resect)el2. -eermine !e oal elecromot)e &orce %!en !e generaor is conneced s!or0 s!un. Assume a brus! conac dro o& 1 er brus! and an armaure resisance o& (.1 o!m. 5elec one< a. 41,.'/ b. 411.4' c. 41'.4' d. 41".4 =eedback 8!e correc ans%er is< 41".4 Queston 1" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An indusrial load is aking "(( k* a (., lagging .&. is desired o raise !e .&. o (.,, lagging using a s2nc!ronous mac!ine %!ose o%er inu is /(( k*. Calculae !e kA ratng o& !e moor reuired &or suc! oe raton and !e o%er &acor a %!ic! !e moor %ill oerae. 5elec one< a. /(" kA# (.', leading b. /( kA# (.,, leading c. /," kA# (.', leading d. /," kA# (.77 leading =eedback 8!e correc ans%er is< /," kA# (.', leading Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e %inding o& a 40ole alernaor !a)ing /, slos and a coil san o& 1 o is s!or0ic!ed b2 degrees. 5elec one< a. 4( b. 14( c. ( d. '( =eedback 8!e correc ans%er is< 4( Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o /0!ase alernaors oeraton in arallel deli)ers o%er a a line oental o& ''(( ols o an induct)e load o& 1"( k* a ($ .&. H& !e armaure currens o& !e %o alernaors be eual one be oeratng a uni2 .&. 6o% muc! o%er does eac! alernaor sul2 o !e load+ 5elec one< a. bo! 7" k* one a uni2 .&. b. 1(( k* &or uni2 am "( k* c. 11'.7 k* &or uni2 .&. am /.' k* d. 117.'
k* &or uni2 .&. am /'. k* =eedback 8!e correc ans%er is< 117.' k* &or uni2 .&. am /'. k* Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 9/.7/$ b. 94.("$ c. 91.7$ d. 9'.1/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston 19 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''(( # '(( !# /0!ase mes! conneced s2nc!ronous moor is %orking on &ull load a an e3cienc2 o& (. and (. & leading. 8!e armaure reacance er !ase is " o!ms. -eermine !e induced em& er !ase. eglec resisance. 5elec one< a. '/( b. '/(7 c. '/77 d. '/4" =eedback 8!e correc ans%er is< '/77 Queston '( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A ,( MA# ,9./0k# !ree !ase s2nc!ronous generaor !as a s2nc!ronous reacance o& 1" o!ms er !ase and negligible armaure resisance. 8!e generaor is deli)ering rae o%er a ($ o%er &acor lagging a raed erminal )olage o an inInie bus0bar. H& !e generaed em& is /, k er !ase# %!a is !e maximum !ree !ase o%er !a !e generaor an deli)er be&ore losing is s2nc!ronism. 5elec one< a. 1'( M* b. /'( M* c. 9, M* d. ' M* =eedback 8!e correc ans%er is< ' M* Queston '1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A d.c. moor de)elos a orue o& '(( 0m a '" rs. A '( rs# i %ill de)elo a orue o& 0m. 5elec one< a. 1' b. '"( c. '(( d. 1,( =eedback 8!e correc ans%er is< '(( Queston '' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase cusomer !as a maximum demand o& " kA. *!a rans&ormer ratng s!all be used i& conneced oen0%2e0oen dela+ 5elec one< a. 4" kA b. 1(( kA c. // kA d. "( kA =eedback 8!e correc ans%er is< "( kA Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un moor %i! an armaure resisance o& (.1" o!m is running a 1'(( rm &or a load %!ic! reuires o& armaure curren o& "( amere &rom a '/( )ol source. A no load# !e armaure curren is " amere. H& !e eec o& armaure reacton !as reduced !e air ga Tux '$ &rom no load o &ull load# %!a is !e no load seed+ 5elec one< a. 1', rm b. 1#'(9 rm c. 1'1" rm d. 1#'1' rm =eedback 8!e correc ans%er is< 1#'1' rm Queston '4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A long s!un comound generaor deli)ers 1(( A# '"( a raed load. 8!e resisances o& !e )arious %indings are< armaure > (.1 o!m# inerole > (.(' o!m# s!un Ield > 1(( o!ms and series Ield > (.('" o!m. H& !e sra2 o%er losses amoun o 1. k*# sol)e &or !e o)erall e3cienc2 o& !e generaor. 5elec one< a. ./'$ b. 9(."'$ c. 7.4/$ d. ,./,$ =eedback 8!e correc ans%er is< ,./,$ Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure o& a 40ole dc generaor is reuired o generae an e.m.&. o& "'( on oen circui %!en re)ol)ing a a seed o& ,,( rm. Calculae !e magnetc Tux er ole reuired i& !e armaure !as 144 slos %i! ' coil sides er slo# eac! coil consistng o& !ree urns. 8!e armaure is %a)e0%ound. 5elec one< a. '7.4 m*bKole b. "4. m*bKole c. 41.1 m*bKole d. 1/.7 m*bKole =eedback 8!e correc ans%er is< '7.4 m*bKole Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum curren. 5elec one< a. './ kA b. /./ kA c. "./ kA d. 4./ kA =eedback 8!e correc ans%er is< './ kA Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =or sul2ing is a balanced /0!ase load o& 4(0kA# ratng o& eac! rans&ormer in 0 bank# s!ould be nearl2 kA. 5elec one< a. '/ b. '( c. '" d. /4., =eedback 8!e correc ans%er is< '/ Queston ' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex An 0ole# '"( # %a)e0%ound generaor !as 4(( conducors. H& !e generaor is o be la0%ound# !e number o& conducor reuired is 5elec one< a. /'(( b. 1(( c. (( d. 1,(( =eedback 8!e correc ans%er is< 1,(( Queston '9 Hncorrec Mark (.(( ou o& 1.(( = lag ueston Queston ex A dc s!un moor runs a 9(( rm &rom a 4,( sul2 %!en aking an armaure curren o& '" A. Calculae !e seed o& %!ic! i %ill run &rom a '/( sul2 %!en aking an armaure curren o& 1" A. 8!e resisance o& !e armaure circui is (. o!m. Assume Tux er ole a '/( !a)e o decrease o 7"$ o& is )alue a 4,( 5elec one< a. "9" b. 49" c. 4" d. " " =eedback 8!e correc ans%er is< "9"
Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e namelae ratng o& a s!un moor is 1"( !# ,(( )ols# '(" A# 17(( rm. 8!e resisance o& !e s!un Ield circui is '4( o!ms and !e oal armaure circui resisance is (.1" o!m. H& !e moor is o be deli)er &ull0load orue a 1#'(( rm# %!a )alue o& resisance mus be added o !e armaure circui+ 5elec one< a. (.(' o!m b. (.'7 o!m c. (.// o!m d. (.,' o!m =eedback 8!e correc ans%er is< (.'7 o!m Queston /1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o single !ase rans&ormers %i! eual ratngs and urns rato are oeraed in arallel o sul2 a load o& 1( k* a a lagging & o& (.9(. 8rans&ormer A !as a resisance o& 1$ and a reacance o& ,$. 8rans&ormer B !as a resisance o& '$ and a reacance o& "$. Calculae !e o%er deli)ered b2 eac! rans&ormer. 5elec one< a. 79 k*# 9' k* b. / k*# 97 k* c. ( k*# 1(( k* d. k*# 9' k* =eedback 8!e correc ans%er is< ( k*# 1(( k* Queston /' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0sack R seer moor !as a se angle o& 1( degrees. *!a is !e number o& roor ee! in eac! sack+ 5elec one< a. /, degrees b. 1 deg rees c. 1' degrees d. '4 degrees =eedback 8!e correc ans%er is< 1' degrees Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''(0 s!un moor deli)ers 4( ! on &ull0load a 9"( rm and !as an e3cienc2 o& $. 8!e armaure and Ield resisances are (.' o!m and 11( o!ms# resect)el2. -eermine !e sartng resisance suc! !a !e sartng armaure curren does no exceed 1., tmes !e &ull0load curren. 5elec one< a. (.71' o!m b. (.7/9 o!m c. (.7(4 o!m d. (.7/' o!m =eedback 8!e correc ans%er is< (.7(4 o!m Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e rato o& !e rimar2 o secondar2 )olage o& a rans&ormer is ' (.(" o!m and R& > "7." o!ms. H& !e generaor oeraes a raed )olage# calculae !e induced )olage a !al& &ull0 load. eglec brus!0conac dro. 5elec one< a. '41 b. '"' c. '/.' d. '/ =eedback 8!e correc ans%er is< '41 Queston '" Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex 8!e roor o& a ''( # ,( 6# 40ole inducton moor !as a o%er inu o& ( k* is obser)ed !a !e roor em& makes 9( c2cles er minue. Calculae !e roor coer loss. 5elec one< a. 4 k* b. ' k* c. / k* d. " k* =eedback 8!e correc ans%er is< ' k* Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A long0s!un comound generaor sulies "( k* a '/( . !e oal Ield0 and armaure0circui
resisances are 4, o!ms and (.(/ o!m# resect)el2. 8!e brus!0conac dro is ' . -eermine !e ercen )olage regulaton. eglec !e armaure reacton. 5elec one< a. /."7$ b. /.77$ c. /.97$ d. '.9$ =eedback 8!e correc ans%er is< /.77$ Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!a is !e &reuenc2 o& !e generaed em& o& a 1( ole alernaor dri)en a 7'( rm+ 5elec one< a. ,( 6 b. '" 6 c. "" 6 d. "( 6 =eedback 8!e correc ans%er is< ,( 6 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0!ase# 0ole dela conneced generaor !as a line curren o& "(( ameres. H& con)ered in %2e# %!a is !e olerable curren+ 5elec one< a. /71." A b. '.7 A c. '4".1 A d. /1".' A =eedback 8!e correc ans%er is< '.7 A Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4 ole# 1' slo la0%ound dc armaure !as %o coil sidesKslo. Assuming single urn coil# calculae !e back ic! &or rogressi)e and rerogressi)e %inding. 5elec one< a. / am " b. , am 4 c. 7 am " d. " am / =eedback 8!e correc ans%er is< 7 am " Queston /( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex H& !ree rans&ormers in a dela0 dela are deli)ering !eir raed load and one rans&ormer is remo)ed# !en o)erload and e ac! o& !e remaining rans&ormer is ercen. 5elec one< a. " b. 7/.' c. 17/.' d. ,,.7 =eedback 8!e correc ans%er is< 7/.' Queston /1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase 0 conneced s2nc!ronous moor %i! a line0o0line )olage o& 44( and a s2nc!ronous seed o& 9(( rm oeraes %i! a o%er o& 9 k* and a lagging o%er &acor o& (.. 8!e s2nc!ronous reacance er !ase is 1( o!ms. -eermine !e orue angle in elecrical degrees. 5elec one< a. /"."1 degrees b. /.4, degrees c. //."1 degrees d. /,.// degrees =eedback 8!e correc ans%er is< /"."1 degrees Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4#4(( )ol# ,( 6 rans&ormer !as a core loss o& 4( *a@s# o& %!ic! one0!ird is edd20curren loss. -eermine !e core loss o& !is rans&ormer %!en i is conneced o a 4#,(( ols# "( 6. 5elec one< a. ,79 *a@s b. 79 *a@s c. 779 *a@s d. 977 *a@s =eedback 8!e correc ans%er is< 977 *a@s Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o s!un generaors oeratng in arallel are gi)ing a oal ouu o& /'( k*. eneraor A< Armaure resisance > (.(' o!m# Hnduced em& > 4"( eneraor B# Armaure resisance > (.('" o!m# Hnduced em& > 4,( . =ind !e bus bar )olage. eglec s!un Ield curren. 5elec one< a. 44,." b. 4"(./ c. 44,." d. 4,4.' =eedback 8!e correc ans%er is< 44,." Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /(0kA# '#4((K'4( )ols# ,(06 rans&ormer !as a &ull0load o%er o& uni2 o)er !e eriod o& '4 !rs. 8!e maximum e3cienc2 is 9"$ and i occurs a &ull0 load. Calculae !e all0da2 e3cienc2 i& loaded ,0!ours a &ull0load. 5elec one< a. ./$ b. 9'.4"$ c. 7.9($ d. 9.,7$ =eedback 8!e correc ans%er is< ./$ Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!en a 4((0# "(06# ,0ole inducton moor is roatng a 9,( rm on no0 load# is sli is 5elec one< a. / er cen b. 4 er cen c. ' er cen d. 1 er cen =eedback 8!e correc ans%er is< 4 er cen Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind !e rimar2 )olage o& a o%er rans&ormer under !e &ollo%ing conditons / urns &or rimar2# , urns &or secondar2 and 1'( )ols &or secondar2 )olage. 5elec one< a. )ols b. 1' )ols c. ,( )ols d. , )ols =eedback 8!e correc ans%er is< ,( )ols Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '4( )ols dc s!un moor !as an armaure curren o& "( amere# armaure resisance o& (.'" o!m running a 1'(( rm. H& i is run a ''( )ols# %!a )alue o& armaure curren %!en dri)ing !e same load. 8!e Ield is ad;used so !a !e seed remains a 1'(( rm. 5elec one< a. ,( b. "" c. "( d. "7." =eedback 8!e correc ans%er is< "" Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a brake es !e eect)e load on !e branc! ulle2 %as /.1 kg# !e eect)e diameer o& !e ulle2 is ,/." cm and !e seed is 1' r..s. 8!e moor ook 49 amere a ''( )ols. *!a is !e e3cienc2 a !is load+ 5elec one< a. ,$ b. /$ c. "$ d. ($ =eedback 8!e correc ans%er is< /$ Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A ''( )ols single !ase inducton moor dra%s curren o& 1( ams a (.7" &. A caacior o& "( micro0= is conneced in order o imro)e !e o%er &acor. *!a is !e ne% o%er &acor+ 5elec one< a. (.9" leading b. (. ,, leading c. (.,, lagging d. (.9" lagging =eedback 8!e correc ans%er is< (.9" lagging Queston 4( Hncorrec Mark (.(( ou
o& 1.(( =lag ueston Queston ex A 40ole moor is la %ound %i! 7' conducors# and !as a Tux o& '" m*b er ole. 8!e armaure akes "( A in c urren !e resulan demagneting eec due o armaure reacton reduces !e air0ga Tux b2 "$. Calculae !e de)eloed orue. 5elec one< a. 1,7./ 0m b. 1/7., 0m c. 144. 0m d. 17,./ 0m =eedback 8!e correc ans%er is< 1/7., 0m Queston 41 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure o& a moor !as o& 4(( act)e conducors# !e Tux densi2 in !e Ie ld being /((( gauss. 8!e axial leng! o& !e armaure is '(./' cm. 8!e curren is /( ameres. -eermine !e oal &orce exered in !e armaure. 5elec one< a. (.(7 b. 4/9.' c. 7/1." d. ,4".9 =eedback 8!e correc ans%er is< 7/1." Queston 4' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!or0s!un comound generaor deli)ers a load curren o& "( A a a erminal )olage o& '"( )ols. 8!e armaure# series Ield# s!un Ield resisances are (.(" o!m# (.(/ o!m and '"( o!ms resect)el2. *!a is !e generaed em& o& !e mac!ine+ 5elec one< a. '"4.(" b. ',(.4" c. '"7./4 d. '"( =eedback 8!e correc ans%er is< '"4.(" Queston 4/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase %2e conneced ac generaor is raed 1"(( kA# 11((( . 8!e eect)e resisance and s2nc!ronous reacance er !ase are 1." o!ms and /( o!ms resect)el2. 8o %!a )alue %ill !e erminal )olage rise %!en &ull0load a (. & lagging is s%ic! o. 5elec one< a. 1/ k b. 1' k c. 1" k d. 14 k =eedback 8!e correc ans%er is< 14 k Queston 44 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o searael2 excied dc s!un generaors are conneced in arallel and carr2 a oal load curren o& "(( ameres. eneraor A !as an armaure resisance o& (.(/ o!m and is gene ratng a )olage o& '/( )ols. eneraor B !as an armaure resisance o& (.(4 o!m and is generatng a )olage o& '/( )ols also. Calculae !e erminal )olage. 5elec one< a. '1(."( )ols b. '1".", )ols c. '/( )ols d. ''1.44 )ols =eedback 8!e correc ans%er is< ''1.44 )ols Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc series generaor is sul2ing a curren o& " A o a series lig!tng s2sem !roug! a &eeder o& oal resisance# 1 o!m. 8!e erminal )olage is '"(( )ols. 8!e armaure and series Ield resisances are 1 and 1" o!ms# resect)el2. A /( o!m di)erer resisance is s!uned across !e series Ield. -eermine !e generaed o%er o& !e generaor. 5elec one< a. 1'./'9 k* b. 1/.,( k* c. 1/.''" k* d. 1/.7"( k* =eedback 8!e correc ans%er is< 1/.''" k* Queston 4, Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A "(( kA# 1/'((K'4(( )ols ,( 6 single !ase rans&ormer !as a 4$ reacance and 1$ resisance. 8!e core loss under raed conditon is 1(( %a@s. Calculae !e ercen e3cienc2 o& !is rans&ormer a &ull load and "$ o%er &acor. 5elec one< a. 9,. b. 9.4 c. 97., d. 9,.' =eedback 8!e correc ans%er is< 9.4 Queston 47 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e dc ouu o& a six0 !ase sar0conneced con)erer is "(( k* a 4(( . H& !e & and e3cienc2 o& !e mac!ine is (.,, and (.9' resect)el2# deermine !e ac curren dra%n &rom !e sul2. 5elec one< a. 7/' A b. 7'9 A c. 7,' A d. 74( A =eedback 8!e correc ans%er is< 74( A Queston 4 Hncorrec Mark ( .(( ou o& 1.(( =lag ueston Queston ex *!a is !e a)erage )olage generaed in a mo)ing conducor i& i cus '." x 1(f, max%ells in 1K4( second+ 5elec one< a. ' )ols b. 1( )ols c. 1 )ol d. 1(( )ols =eedback 8!e correc ans%er is< 1 )ol Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4((0# "(06 !ree0!ase inducton moor roaes a 144( rm on &ull0load. 8!e moor is %ound &or 5elec one< a. 40 oles b. 0oles c. ,0oles d. '0oles =eedback 8!e correc ans%er is< 40oles Queston "( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( . 8!e armaure e3cienc2 is 9"$. *!a is !e back em&+ 5elec one< a. 117 )ols b. 11 )ols c. 114 )ols d. 1'' )ols =eedback 8!e correc ans%er is< 114 )ols Queston 1 Hncorrec Mark (.(( ou o& 1.(( Queston ex A 40 ole# simlex# %a)e0%ound generaor !as "7 slos# %!a is !e coil ic!+ 5elec one< a. 4 b. 14.'" c. 14 d. 7 =eedback 8!e correc ans%er is< 14 Queston ' Hncorrec Mark (.(( ou o& 1.(( Queston ex =or a 40 ole# '0la2er d.c. la %inding %i! '( slos and one conducor er la2er# !e number o& commuaor bars is 5elec one< a. 4( b. 1,( c. '( d. ( =eedback 8!e correc ans%er is< '( Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 1'(( kA# ,,(( )ol# /0!ase# 0conneced alernaor !as an eect)e resisance o& (.4( o!m and a reacance o& , o!ms er !ase. H deli)ers &ull load curren o& (.(
lagging o%er &acor a raed )olage. *!a %ill be !e erminal )olage &or !e same exciaton and load curren i& !e o%er &acor is (.( leading+ 5elec one< a. 97 b. 4'"( c. 4",( d. 79 =eedback 8!e correc ans%er is< 79 Queston 4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A uant2 is exressed in er uni i& i is di)ided b2 a c!osen base uant2 !a)ing !e same !2sical dimensionP. 5uose !a &or a 1(0kA# '4((0K'4(0 rans&ormer %e c!oose< :base> 1(k*# 1#base > '4(( # '#base > '4( . 8!is rans&ormer !as !e &ollo%ing es daa< Oen0circui es lo%0)olage sideP< '4( # (. A# ( * 5!or0circui es !ig!0)olage sideP< ( # ".1 A# ''( *. *!a is !e series resisance in er uni+ 5elec one< a. (.(14 u b. (.(114 u c. (.(1, u d. (.(14 u =eedback 8!e correc ans%er is< (.(14 u Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& a !2brid seer moor !as a roor ic! o& /, degrees and a se angle o& 9 degres# !e number o& is !ases mus be 5elec one< a. 4 b. ' c. , d. / =eedback 8!e correc ans%er is< 4 Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind !e )olage regulaton o%er sul2 %i! 4(( %i!ou load and '(( %i! &ull load. 5elec one< a. 1(($ b. "$ c. "($ d. 1($ =eedback 8!e correc ans%er is< 1(($ Queston 7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e :8s o& a ''( k ransmission line !a)e a rato o& 1/'.7, kK,,./7" are conneced %2e0%2e. A )olmeer conneced line o ground reads ,, )ols# %!a is !e ransmission line )olage+ 5elec one< a. ''(.1( k b. ''".'" k c. ''/.1" k d. ''.,/ k =eedback 8!e correc ans%er is< ''.,/ k Queston Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# !e iron loss o& !e rans&ormer a raed )olage bu "( 6 %ould be %a@. 5elec one< a. ( b. 1(( c. 1.'" d. ,4( =eedback 8!e correc ans%er is< ,4( Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase alernaor !as , slos er ole er !ase. -eermine !e disributon &acor. 5elec one< a. (.9,/ b. (.9", c. (.94 d. (.977 =eedback 8!e correc ans%er is< (.9", Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A '#"(( kA# !ree0!ase# ,(06# ,., k %2e0conneced alernaor !as a Ield resisance o& (.4" o!m and an armaure resisance o& (.(" o!m er !ase. 8!e Ield curren a &ull load (." o%er &acor is '(( A. 8!e sra2 o%er losses amoun o ' k*. Calculae !e e3cienc2 o& !e alernaor a &ull0load# (." o%er &acor lagging. 5elec one< a. 9,./$ b. 94.$ c . 9".'$ d. 9/.7$ =eedback 8!e correc ans%er is< 9".'$ Queston 11 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e number o& arallel a!s in !e armaure %inding o& a &our ole %a)e conneced dc mac!ine !a)ing '' coil0sides is 5elec one< a. ' b. 4 c. 11 d. '' =eedback 8!e correc ans%er is< ' Queston 1' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o rans&ormers A and B !a)ing eual ouus and )olage ratos bu uneual ercenage imedances o& 4 and ' are oeratng in arallel. 8rans&ormer A %ill be running o)er0load b2 ercen. 5elec one< a. '" b. "( c. ,, d. // =eedback 8!e correc ans%er is< // Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a ,0ole d.c. mac!ine# 9( mec!anical degrees corresond o elecrical degrees. 5elec one< a. /( b. '7( c. 1( d. 4" =eedback 8!e correc ans%er is< '7( Queston 14 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e armaure and Ield circuis o& a '/( ol s!un moor !a)e resisance o& (./1 and 11" o!ms resect)el2. H akes "' Am %!en oeratng a a cerain load. *!a is !e armaure o%er de)eloed+ 5elec one< a. 14.4 ! b. 1'.4 ! c. '4., ! d. 7." ! =eedback 8!e correc ans%er is< 14.4 ! Queston 1" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A !ree !ase# /1.7" kA# '/(( alernaor !as an armaure resisance o& (./" o!ms er !ase and s2nc!ronous reacance o& 1.' o!ms er !ase. -eermine !e )olage regulaton a &ull load (., o%er &acor leading. 5elec one< a. 4.//$ b. 0,.1'$ c. ,.1'$ d. 04.//$ =eedback 8!e correc ans%er is< 04.//$ Queston 1, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A %ound roor moor# 7." 6:# '/( )ols# /0!ase akes a line curren o& 1.4 ameres# %!en oeratng a raed ouu a an e3cienc2 o& $. Calculae !e indicatons on %a@meers %!en !ese are insered o measure o%er b2 !e %o %a@meer me!od. 5elec one< a. 4.'/' k*# '.1', k* b. /.9(' k*# '.4", k* c. 4.(/" k*# './'" k* d. /."" k*# '."(/ k* =eedback 8!e correc ans%er is< 4.'/' k*# '.1', k* Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag
ueston Queston ex A 1" ! ''( )ol# 1'(( rm s!un moor akes "( Ameres. Hs armaure resisance is (.1 o!m and Ield resisance is ''( o!ms. Brus! conac )olage dro is ' )ols. =ricton and %indage loss is 4(( %a@s and sra2 load loss o& 1$ o& !e ouu. Calculae !e e3cienc2. 5elec one< a. 94.,$ b. 91.$ c. 9'.4$ d. 9.4$ =eedback 8!e correc ans%er is< 91.$ Queston 1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e s!a? o%er o& a s!un moor is 7. !. H dra%s "( A &rom 1'( . 8!e Ield %inding dra%s 1.' A. *!a is !e e3cienc2 o& !e moor+ 5elec one< a. 9/$ b. 9,.9$ c. 94.7$ d. 9.'$ =eedback 8!e correc ans%er is< 9,.9$ Queston 19 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex A ''( s!un moor dri)ing is normal load dra%s an armaure curren o& "( A &rom a ''( dc source. 8!e armaure resisance o& !is moor including brus!es is (.'" o!m. 6o% muc! armaure curren minimumP %ill !is moor dra% &rom a '(( dc source %!en dri)ing !e same load %i! !e Ield ad;used o mainain !e same seed+ 5elec one< a. "".7, A b. ,(.1' A c. ,/.4 A d. ".'4 A =eedback 8!e correc ans%er is< "".7, A Queston '( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 40ole la0%ound armaure !as 144 slos %i! %o coil sides er slo# eac! coil !a)ing %o urns. H& !e Tux er ole is ' m*b and !e armaure roaes a 7'( rm. *!a is !e induced )olage+ 5elec one< a. ,9.1' b. 1/.'4 c. '7,.4 d. /4.9, =eedback 8!e correc ans%er is< ,9.1' Queston '1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance o o!mic resisance is 1.". 8!e o!mic resisance is obained b2 connectng %o erminals o a d.c source. 8!e curren )olage are 7., Ameres and , )ols resect)el2. *!a is !e ercen resisance+ 5elec one< a. ' b. 1 c. / d. 4.' =eedback 8!e correc ans%er is< / Queston '' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "(0k* 4,0)ol s!un generaor !as a )olage regulaton o& .7 ercen. Calculae !e no0load erminal )olage. 5elec one< a. "(" b. 49( c. "(( d. 47" =eedback 8!e correc ans%er is< "(( Queston '/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e inu and ouu o%ers o& a ''( # s!un moor are /( and ' k* resect)el2. 8!e Ield and armaure circui resisances are 4( o!ms and (.(1'" o!m resect)el2. -eermine !e e3cienc2 o& !e moor i& !e ouu o%er is reduced o 1( k*. 5elec one< a. .,7$ b. 4.9/$ c. ,.4$ d. /.",$ =eedback 8!e correc ans%er is< 4.9/$ Queston '4 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 9'.1/$ b. 94.("$ c. 91.7$ d. 9/.7/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 7(0!# '/(0)ols# /0!ase inducton moor oeratng a (.77 o%er &acor !as a sartng curren o& " tmes is &ull0load curren. Calculae !e sartng curren. 5elec one< a. 17( ams b. 1#47" ams c. '9" ams d. "1 ams =eedback 8!e correc ans%er is< "1 ams Queston ', Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 44( )ol s!un moor !as an armaure resisance o& (. o!m and Ield resisance o& '(( o!ms. *!a is !e armaure o%er de)eloed %!en gi)ing an ouu o& 7.4, k* a "$ e3cienc2+ 5elec one< a. 7.4, k* b. 7.", k* c. .4, % d. 7.'/k* =eedback 8!e correc ans%er is< 7.", k* Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a brake es !e eect)e load on !e branc! ulle2 %as /.1 kg# !e eect)e diameer o& !e ulle2 is ,/." cm and !e seed is 1' r..s. 8!e moor ook 49 amere a ''( )ols. *!a is !e e3cienc2 a !is load+ 5elec one< a. "$ b. ($ c. /$ d. ,$ =eedback 8!e correc ans%er is< /$ Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An inducton moor o& /(0!# ''(0)ols# /0!ase dra%s 4"( ercen o& !e raed curren %i! !e raed )olage and deli)ers during !e sartng eriod 1/( ercen o& !e raed orue. 8!e &ull0load e3cienc2 and &ull0load o%er &acor o& !is moor is ($ and 7($ resect)el2. H& an auorans&ormer is used as a sartng uni and sartng orue o& !e load is onl2 "( ercen o& !e raed orue o& !e moor# Ind !e sartng )olage and sartng curren o& !e line. 5elec one< a. 17.9( )ols and '., ams b. ''( )ols and ''7./ ams c. 1/,.44 )ols and '9'.7 ams d. '4".7 )ols and /(1.4 ams =eedback 8!e correc ans%er is< 1/,.44 )ols and '9'.7 ams Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /#,(( )ols !ree0!ase sar conneced
urbo s2nc!ronous generaor o& s2nc!ronous reacance o& (." o!m er !ase and negligible resisance is sul2ing /(#((( kA a (. & lagging o a large o%er s2sem. H& !e seam sul2 is cu0o# calculae !e amoun o& curren !a !e generaor %ill !en carr2 assuming negligible losses. 5elec one< a. /(94 A b. /'/ A c. /9(1 A d. /7( A =eedback 8!e correc ans%er is< /7( A Queston /( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex H& maximum orue o& an inducton moor is '(( kg0m a a sli o& 1'$# !e orue a ,$ sli %ould be kg0m. 5elec one< a. 1(( b. 1,( c. "( d. 4( =eedback 8!e correc ans%er is< 1,( Queston /1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!or s!un comound generaor deli)ers 1"( A a a erminal )olage o& '/( . 8!e s!un Ield curren is '." A . 8!e resisance o& !e armaure# series Ield and di)erer are (.(/' o!m# (.(1" o!m and (.(/ o!m# resect)el2. Calculae !e elecrical e3cienc2 o& !e generaor a !is load. 5elec one< a. 9,.4$ b. 9/.$ c. 94.'$ d. 9".7$ =eedback 8!e correc ans%er is< 9".7$ Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '( k*# '(( s!un generaor is oeraed a raed load. H& !e dri)ing engine is de)eloing /( 6:# deermine !e iron and &ricton losses. Armaure resisance is (.(" o!m and Ield resisance is "( o!ms. 5elec one< a. 9/4 * b. 1/4( * c. 1(/9 * d. 9"4 * =eedback 8!e correc ans%er is< 1(/9 * Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e curren !a To%s !roug! !e common %inding o& a '(0kK7.97 k auorans&ormer is '(( ameres. -eermine !e secondar2 curren. 5elec one< a. ''( ameres b. //( ameres c. 1"( ameres d. '( ( ameres =eedback 8!e correc ans%er is< //( ameres Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e &reuenc2 o& em& generaed in an 0ole alernaor running a 9(( rm is 5elec one< a. ,( 6 b. none o& !ese c. "( 6 d. 1'( 6 =eedback 8!e correc ans%er is< ,( 6 Queston /" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A bel0dri)en 1"( k* s!un %ound -C generaor is running a 4"( rm and is sul2ing &ull0load o a bus bar a '4( . A %!a seed %ill i run i& !e bel breaks and !e mac!ine contnues o run aking ." k* &rom !e bus bar+ 8!e armaure and Ield resisance are (.(" o!m and " o!ms resect)el2. 8!e brus! conac dro is 1." er brus!. eglec armaure reacton. 5elec one< a. /" rm b. / rm c. / 9" rm d. 4(' rm =eedback 8!e correc ans%er is< /9" rm Queston /, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex =or a coil !a)ing a san o& 'K/ or ole ic!# !e coil san &acor is 5elec one< a. (.7, b. (.9,, c . (. d. (.,, =eedback 8!e correc ans%er is< (.,, Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o /0!ase alernaors oeraton in arallel deli)ers o%er a a line oental o& ''(( ols o an induct)e load o& 1"( k* a ($ .&. H& !e armaure currens o& !e %o alernaors be eual one be oeratng a uni2 .&. 6o% muc! o%er does eac! alernaor sul2 o !e load+ 5elec one< a. 1(( k* &or uni2 am "( k* b. 117.' k* &or uni2 .&. am /'. k* c. 11'.7 k* &or uni2 .&. am /.' k* d. bo! 7" k* one a uni2 .&. =eedback 8!e correc ans%er is< 117.' k* &or uni2 .&. am /'. k* Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8!e losses in a ''( # !ree0 !ase# '" 6# 40ole inducton moor a &ull0load are as &ollo%s< Core > /.($# =ricton and %indage > '.($# 5aor Cu loss > 4.($# Roor Cu loss > '.($# A 7($ o& &ull0load o& !e mac!ine# deermine is seed and e3cienc2 5elec one< a. 1#17( rm and .7$ b. 1#'(( rm and 9.1$ c. 1#(( rm and 7.9/$ d. 74( rm and 9.1$ =eedback 8!e correc ans%er is< 74( rm and 9.1$ Queston /9 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '4( )ol d.c. moor on brake es ook "' Am %!en running a 1"(( rm. 8!e sring balance a !e end o& !e 7, cm brake arm reads 9/." . *!a is !e e3cienc2 o& !e moor a !is load+ 5elec one< a. (.9" b. (." c. (.9( d. (., =eedback 8!e correc ans%er is< (.9( Queston 4( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A single !ase ,( 6 rans&ormer !as is core )alue o& 1." x 1(f0/ cu m. 8!e maximum Tux densi2 is 1.( 8esla and !e !2seresis consan o& !e core is 7"((. =ind !e !2seresis loss. 5elec one< a. 7"" *a@s b. ,7" *a@s c. /"" *a@s d. '"" *a@s =eedback 8!e correc ans%er is< ,7" *a@s Queston 41 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e ne cross secton o& a rans&ormer is '( suare inc!es. 8!e maximum Tux densi2 is 11 kilogausses. 8!e &reuenc2 is ,( 6. H& !ere are 1#((( urns in !e rimar2# deermine !e rimar2 induced em&. 5elec one< a. /"( b. /"9( c. /7( d. /94" =eedback 8!e
correc ans%er is< /7( Queston 4' Hncorrec Mark (.(( ou o& 1.(( = lag ueston Queston ex 8!e curren a !e common %inding o& a '(kK7.97k auo0rans&ormer is '((A. *!a is !e c urren a !e secondar2+ 5elec one< a. //'.4" A b. 14'.'' A c. 1/'.4" A d. '(( A =eedback 8!e correc ans%er is< //'.4" A Queston 4/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(06:# 40ole# '" 6# /0!ase inducton moor is aking 91(( %a@s &rom !e line. Core loss is '9( %a@s saor coer loss is ", %a@s roor coer loss is 44" %a@s and !e &ricton and %indage loss is 1'1 %a@s. -eermine !e ouu orue in e%on0meers. 5elec one< a. 1(1.' b. 11'." c. 1(.4 d. 1(/./ =eedback 8!e correc ans%er is< 1(/./ Queston 44 Cor rec Mark 1.(( ou o& 1.(( =lag ueston Queston ex 6o% man2 arallel a!s does a ,0ole rilex la0%ound conneced armaure %inding o& a dc generaor !a)e+ 5elec one< a. / b. 1 c. , d. 1' =eedback 8!e correc ans%er is< 1 Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A "(( k*# ,((0 -C# 1'0!ase s2nc!ronous con)erer oeraes as a direc con)erer a a &ull load e3cienc2 o& 9'$ and a o%er &acor o& (.9/. Calculae !e AC )olage be%een sli rings and !e AC curren dra%n &rom a 1'0!ase rans&ormer &ed sul2. 5elec one< a. 11' # '1" A b. 11( # ''9 A c. 11( # '1" A d. 11' # ''9 A =eedback 8!e correc ans%er is< 11( # ''9 A Queston 4, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "((( kA# /0!ase# 1( k# "( 6 alernaor runs a 1"(( rm conneced o consan &reuenc2# consan )olage busbars. H& !e momen o& inerta o& entre roatng s2sem is 1." x 1(f4 kg0mf' and !e sead2 s!or circui curren is " tmes !e normal &ull load curren. Calculae !e naural tme eriod o& oscillaton. 5elec one< a. 1./ sec b. 1.' sec c. 1.4 sec d. 1." sec =eedback 8!e correc ans%er is< 1.4 sec Queston 47 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /(0kA# '#4((K'4( )ols# ,(06 rans&ormer !as a &ull0load o%er o& uni2 o)er !e eriod o& '4 !rs. 8!e maximum e3cienc2 is 9"$ and i occurs a &ull0load. Calculae !e all0da2 e3cienc2 i& loaded ,0!ours a &ull0load. 5elec one< a. ./$ b. 7.9($ c. 9'.4"$ d. 9.,7$ =eedback 8!e correc ans%er is< ./$ Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o %a@meer me!od is used o es a '" 6:# '/( )ol# 1(( rm# ,( c2cle# /0!ase inducton moor. *!en !e line )olages are '/( )ols# one %a@meer reads G1/#4(( %a@s and !e o!er G7#4(( %a@s. -eermine moor line curren. 5elec one< a. ".4 A b. ""., A c. "'./ A d. "(. A =eedback 8!e correc ans%er is< ".4 A Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex An oen0dela conneced rans&ormer bank ser)es a balanced /0!ase load o& 4( kA a '/( and (.,, & lagging. 5ol)e &or !e real o%er and & a %!ic! eac! rans&ormer is oeratng. 5elec one< a. 11."4 k* a (.,, & and '/.(9 k* a (.7(7 & b. 1'.'' k* a (.,, & and ''.4'9 k* a (.7(7 & c. 1'.'' k* a (." & and ''.4' a uni2 & d. 11."4 k* a (." & and '/.(9 k* a uni2 & =eedback 8!e correc ans%er is< 11."4 k* a (." & and '/.(9 k* a uni2 & Queston "( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A /0!ase alernaor generaes an oen0circui !ase )olage o& 4((( %!en excitng curren is "( A !e s!or0circui curren &or !e same exciaton being (( A. 8!e s2nc!ronous reacance er !ase is 5elec one< a. ( o!ms b. none o& !ese c. 1" o!ms d. " o!ms =eedback 8!e correc ans%er is< " o!ms =inis! re)ie% 5ki Qui na)igaton Qui na)igaton Queston18!is ageQueston'Queston/Queston4Queston"Queston,Queston7QuestonQueston9Queston1(Ques t on11Queston1'Queston1/Queston14Queston1"Queston1,Queston17Queston1Queston19Quest o n'(Queston'1Queston''Queston'/Queston'4Queston'"Queston',Queston'7Queston'Questo n '9Queston/(Queston/1Queston/'Queston//Queston/4Queston/"Queston/,Queston/7Queston / Queston/9Queston4(Queston41Queston4'Queston4/Queston44Queston4"Queston4,Queston4 7 Queston4Queston49Queston"( 5!o% one age a a tme=inis! re)ie% ou are logged in as REX HA H\\AO \ogouP EE Exi Exam ' A dc s!un moor de)elos 1" ! a 1'( . 8!e armaure e3cienc2 is 9"$. *!a is !e back em&+ 5elec one< a. 117 )ols b. 1'' )ols Hncorrec c. 11 )ols d. 114
)ols =eedback 8!e correc ans%er is< 114 )ols Queston ' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A 10!ase# 1(( kA# '4((K'4( ol# ,( 6 rans&ormer !as a rimar2 resisance and secondar2 %inding resisance o& (.' o!ms and (.((9 o!m resect)el2. Calculae !e eui)alen resisance re&erred o !e rimar2. 5elec one< a. 1.7' o!ms b. 1., o!ms c. (./7 o!ms Hncorrec d. 1.4, o!ms =eedback 8!e correc ans%er is< 1.7' o!ms Queston / Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum curren. 5elec one< a. "./ kA b. './ kA c. 4./ kA d. /./ kA Hncorrec =eedback 8!e correc ans%er is< './ kA Queston 4 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex An ac generaor 1"(( kA caaci2 !as a &ull load e3cienc2 o& 91$ a 1(($ o%er &acor and ,$ e3cienc2 a ($ o%er &acor lagging. *!a engine dri)e in 6 is reuired i& !e gense is o sul2 entrel2 incandescen lam+ 5elec one< a. 19( b. /1'" c. '"'" Hncorrec d. ''1( =eedback 8!e correc ans%er is< ''1( Queston " Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '((( kA# /4#"((K'4( )ols# ,( 6# /0!ase oil0Illed rans&ormer !as an imedance o& ".7"$. -eermine !e secondar2 &ull load curren. 5elec one< a. 411 b. "'( H ncorrec c. "/"( d. "1(' =eedback 8!e correc ans%er is< 411 Queston , Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A searael2 excied generaor generaes '/( )ols %!en dri)en a 1'(( rm. H& !e Tux is decrease b2 1($# %!a is !e ne% em& %i! seed remains !e same+ 5elec one< a. '(7 )ols b. '"/ )ols c. '/( )ols d. '", )ols Hncorrec =eedback 8!e correc ans%er is< '(7 )ols Queston 7 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '((0kA rans&ormer %i! imedance o& "$ and !e o%er &acor o& !e load is "$. 8!e rimar2 )olage is ,#((( )ols %!ile !e coer loss is " k*. =ind !e ercenage regulaton. 5elec one< a. ".'1$ b. 4.4/$ Correc c. ".(/$ d. 4.(/$ =eedback 8!e correc ans%er is< 4.4/$ Queston C orrec Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '"( # /( 6 generaor sulies o%er o a arallel circui consistng o& a '( ! moor %!ose e3cienc2 is 9($ a (.( & lagging and a second load !a dra%s an aaren o%er o& 7 kA a uni2 &. -eermine !e s2sem react)e o%er. 5elec one< a. 1'.4/" kAR Correc b. '/."' kAR c. 1(./41 kAR d. '(./4 kAR =eedback 8!e correc ans%er is< 1'.4/" kAR Queston 9 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e dierence be%een !e &ron ic! and !e back ic! o& a rerogressi)e la %inding is '. H & !e &ron ic! is '1# %!a is !e back ic!+ 5elec one< a. '1." b. '1 c. '/ Correc d. 19 =eedback 8!e correc ans%er is< '/ Queston 1( Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8%o searael2 excied dc s!un generaors are conneced in arallel and carr2 a oal load curren o& "(( ameres. eneraor A !as an armaure resisance o& (.(/ o!m and is generatng a )olage o& '/( )ols. eneraor B !as an armaure resisance o& (.(4 o!m and is generatng a )olage o& '/( )ols also. Calculae !e erminal )olage. 5elec one< a. '1(."( )ols b. '/( )ols Hncorrec c. '1".", )ols d. ''1.44 )ols =eedback 8!e correc ans%er is< ''1.44 )ols Queston 11 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A s!or0s!un comound generaor deli)ers a load curren o& "( A a a erminal )olage o& '"( )ols. 8!e armaure# series Ie ld# s!un Ield resisances are (.(" o!m# (.(/ o!m and '"( o!ms resect)el2. *!a is !e generaed em& o& !e mac!ine+ 5elec one< a. '"( b. '"4.(" Correc c. ',(.4" d. '"7./4 =eedback 8!e correc ans%er is< '"4.(" Queston 1' Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A "( 6:# 44( # /0!ase# ,( 6# ,0ole suirrel cage inducton moor is oeratng a &ull0load and (. &. 8!e &ull0load e3cienc2 is "$ and !e ercenage sli is "$. -eermine !e &ull0load orue. 5elec one< a. /'/.'4 0m b. '14."" 0m c. '(,.7' 0m d. /1'.47 0m Correc =eedback 8!e correc ans%er is< /1'.47 0m Queston 1/ Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e namelae ratng o& a s!un moor is 1"( !# ,(( )ols# '(" A# 17(( rm. 8!e resisance o& !e s!un Ield circui is '4( o!ms and !e oal armaure circui resisance is (.1" o!m. Calculae !e seed regulaton o& !e moor. 5elec one< a. 4.(7$ b. 4.9$ c. ".'"$ d. ".1$ Correc =eedback 8!e correc ans%er is< ".1$ Queston 14 Correc Mark 1.(( ou o& 1.(( o
Tagged=lag ueston Queston ex A "( kA# '/((K'/( )ols# ,( c2cle rans&ormer is esed in !e laboraor2 so !a is c!araceristcs ma2be deermined. 8!e sandard es reuires an oen circui es and s!or circui es. Oen Circui 8es< H > ,." A# E > '/( # : > 17 * 5!or Circui 8es< H > '1.7 A# E > 11" # : > "7( *. -eermine !e e3cienc2 o& !e rans&ormer a !al& load# uni2 &. 5elec one< a. 9 .4"$ b. 9.7($ Correc c. 97.($ d. 97.""$ =eedback 8!e correc ans%er is< 9.7($ Queston 1" Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A searael2 excied moor a 1(4" rm# %i! a consan Ield curren# %!ile aking an armaure curren o& "( A a 1'( . !e armaure resisance is (.1 o!m. H& !e load on !e moor c!anges suc! !a i no% akes 9" A a 1'( # deermine !e moor seed a !e load. 5elec one< a. 994 rm Hncorrec b. 1(14 rm c. 11(4 rm d. 1((4 rm =eedback 8!e correc ans%er is< 1((4 rm Queston 1, Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ,., k# 0conneced s2nc!ronous moor !as a s2nc!ronous reacance er !ase o& 1( o!ms and a negligible resisance. =or a ce rain load# !e moor dra%s 99( k* a normal )olage. A !is load# !e induced em& er !ase is "1,( . -eermine oeratng &. 5elec one< a. (."1 b. (.4,' c. (.47 Correc d. (."(' =eedback 8!e correc ans%er is< (.47 Queston 17 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex An induct)e load consumes 1( k* a (.7" & lagging. A s2nc!ronous moor %i! a & o& (.9 leading is conneced in arallel %i! !e induct)e load. *!a is !e minimum reuired k* sie o& !e s2nc!ronous moor so !a !e combined load %ill !a)e a & o& (. lagging+ 5elec one< a. 1.1(9 k* b. 1.(, k* Correc c. 1.(7" k* d. 1.'(/ k* =eedback 8!e correc ans%er is< 1.(, k* Queston 1 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A Ball Mill roor is raed 7"(0!# 4,( )ols line o line# ,( 6# (." o%er &acor lagging and (.9" e3cienc2. 5ol)e &or !e raed curren. 5elec one< a. 9(( ams b. 7( ams c. 7( ams Correc d. 99( ams =eedback 8!e correc ans%er is< 7( ams Queston 19 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A 44( )ol s!un moor !as an armaure resisance o& (. o!m and Ield resisance o& '(( o!ms. *!a is !e armaure o%er de)eloed %!en gi)ing an ouu o& 7.4, k* a "$ e3cienc2+ 5elec one< a. 7.4, k* b. 7.", k* c. .4, % Hncorrec d. 7.'/k* =eedback 8!e correc ans%er is< 7.", k* Queston '( Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex An oen dela bank is ser)ing a !ree0!ase roar2 con)erer. 8!e con)erer sulies 17" A o& curren o 1.4 o!m dc resist)e load. H& !e mac!ine dra%s an AC c urren o& 1(( A a (. & lagging# deermine minimum sie o& rans&ormer needed. 5elec one< a. 1".( kA Correc b. 19.4 kA c. '".9 kA d. '4.7 kA =eedback 8!e correc ans%er is< 1".( kA Queston '1 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A long s!un comound moor akes a curren o& 4 ' A &rom a '/( source. Armaure# series Ield and s!un Ield resisances are (.1 o!m# (.' o!m and "( o!ms resect)el2. H& !e &ricton and %indage losses amoun o 4(( *# deermine !e o)er0all e3cienc2 o& !e mac!ine. 5elec one< a. 1.''$ b. (.""$ Correc c. '.'4$ d. 79."/$ =eedback 8!e correc ans%er is< (.""$ Queston '' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8%o s!un generaors running in arallel deli)ers a oal curren o& /#,(( A. Eac! mac!ine !as a Ield resisance o& ,( o!ms and an armaure resisance o& (.(1 o!m. 8!e em&s generaed b2 eac! mac!ine are 4"" and 4,( # resect)el2. Calculae !e k* s!are o& eac! mac!ine. 5elec one< a. ,' k*# 1("7 k* Hncorrec b. ,41 k*# 1(9 k* c. ,7( k*# 1(,9 k* d. ,"' k*# 1(7 k* =eedback 8!e correc ans%er is< ,"' k*# 1(7 k* Queston '/ Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '((0kA rans&ormer !as an imedance o& 1"$ and !e o%er &acor o& !e load is "$. 8!e rimar2 )olage is ,#((( )ols %!ile !e coer loss is 1" k*. =ind !e ercenage )olage regulaton. 5elec one< a. 1/.49$ Correc b. .91$ c. '/.,7$ d. 1".7$ =eedback 8!e correc ans%er is< 1/.49$ Queston '4 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A generaor a no0load oeraes ,1 6# sloe 1 M*K6. \oad 1 > 1.( M* and load ' > (. M* are conneced. =ind !e &reuenc2 be&ore and a?er adding !e load '. 5elec one< a. ,( 6 am "9./ 6 b. ,( 6 am "9 6 Hncorrec c. ,( 6 am "9.' 6 d. ,( 6 am "9.1 6 =eedback 8!e correc ans%er is< ,( 6 am "9.' 6 Queston '" Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex -eermine !e seed in rm o& !e moor a &ull load %i! !e
&ollo%ing circui elemens er !ase< Roor leakage reacance > (.,"# 5aor leakage reacance > 1.1'# Roor resisance > (.1(# 5aor resisance > (.'"# Connecton > 0. 8!is moor is "(( 6:# /0!ase# ''(( )ol# ,(0c2cle# ,0 ole inducton moor %i! additonal core loss o& '#((( %a@s and !e &ricton and %indage losses oal is 1(#((( %a@s. 5elec one< a. 119( rm Correc b. 1'(( rm c. 11 9, rm d. 11 rm =eedback 8!e correc ans%er is< 119( rm Queston ', Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A s!or s!un comound dc generaor deli)ers a load curren o& /( A a ''( and !as armaure# series Ield and s!un Ield resisances o& (.(" o!m# (.(/ o!m# and '(( o!ms resect)el2. Calculae !e generaed )olage allo% 1 &or brus! conac droP. 5elec one< a. ''1.(" b. /(1.", c. ''/.4" Correc d. '9".' =eedback 8!e correc ans%er is< ''/.4" Queston '7 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e )olage o& a 1((0k*# '"(0)ol s!un generaor rises o ',( )ols %!en !e load is remo)ed. *!a is !e &ull0load curren does !e mac!ine deli)er# and %!a is is ercen regulaton+ 5elec one< a. 4(( A# 4$ Correc b. "(( A# "$ c. 4(( A# '$ d. /" A# /."$ =eedback 8!e correc ans%er is< 4(( A# 4$ Queston ' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e Ield curren o& a 1( k*# '"( )ols -C s!un generaor is , A %!en running &ull0load a raed erminal )olage. H& !e combined armaure and brus! resisance is (.(' o!m# sol)e &or !e mec!anical e3cienc2 o& !e generaor. 5elec one< a. 91.7$ b. 9'.1/$ Hncorrec c. 94.("$ d. 9/.7/$ =eedback 8!e correc ans%er is< 9/.7/$ Queston '9 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A '( k*# '((0 s!un generaor is oeraed a raed load. H& !e dri)ing engine is de)eloing /( !# deermine !e iron and &ricton losses. Armaure resisance is (.(" o!m and s!un Ield resisance is "( o!ms. 5elec one< a. 9"4 * b. 1(/4 * H ncorrec c. 1(/9 * d. 1/4( * =eedback 8!e correc ans%er is< 1(/9 * Queston /( Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex *!en a 0 s2sem is con)ered ino a dela0dela s2sem# increase in a caaci2 o& !e s2sem is ercen. 5elec one< a. ,,.7 b. 7/.' Correc c. "( d. ,., =eedback 8!e correc ans%er is< 7/.' Queston /1 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A s!un moor %as esed b2 means o& a ron20brake !a)ing a leng! o& arm o& /." &ee and a are %eig! /.7 ounds. 8!e curren dra%n b2 !e mac!ine &rom a '4(0)ols line %as "(.9 ameres %!en !e scale reading on !e brake %as '4.( ounds and !e seed o& !e moor %as 1#1(/ rm. 8!e resisance o& !e armaure including !e brus!es is (.' o!m and !a o& !e s!un Ield is ',"." o!m. Assume ')ol dro across !e brus!esP. Calculae !e e3cienc2 under !e consideraton o& !e es. 5elec one< a. ".91$ b. 91.11$ Correc c. 9.41$ d. 94.7/$ =eedback 8!e correc ans%er is< 91.11$ Queston /' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance o o!mic resisance is 1.". 8!e o!mic resisance is obained b2 connectng %o erminals o a d.c source. 8!e curren )olage are 7., Ameres and , )ols resect)el2. *!a is !e ercen resisance+ 5elec one< a. 1 Hncorrec b. ' c. 4.' d. / =eedback 8!e correc ans%er is< / Queston // Correc Mark 1.(( ou o& 1.(( o Tag ged=lag ueston Queston ex A generaor is raed 1(( M*# 1/. k and 9($ o%er &acor. 8!e eect)e resisance is 1." tmes !e o!mic resisance. 8!e o!mic resisance is obained b2 connectng %o erminals o a -C source. 8!e curren and )olage are 7., A and , resect)el2. *!a is !e eect)e resisance er !ase+ 8!e generaor is %2e0conneced. 5elec one< a. (./4' o!m b. (.(," o!m c. (.("1/ o!m Correc d. (.(,17 o!m =eedback 8!e correc ans%er is< (.("1/ o!m Queston /4 Correc Mark 1.(( ou o& 1.(( o Tag ged=lag ueston Queston ex 8!e :8s o& a ''( k ransmission line !a)e a rato o& 1/'.7, kK,,./7" are conneced %2e0%2e. A )olmeer conneced line o ground reads ,, )ols# %!a is !e ransmission line )olage+ 5elec one< a. ''".'" k b. ''.,/ k Correc c. ''/.1" k d. ''(.1( k =eedback 8!e correc ans%er is< ''.,/ k Queston /" Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex H& load angle o& a 4 ole s2nc!ronous moor is degrees elecricalP# is )alue in mec!anical degree is . 5elec one< a. 4 Correc b. ' c. (.'" d. (." =eedback 8!e correc ans%er is< 4 Queston /, Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A seed0indicatng de)ice consiss o& a '0ole ermanen magne -C generaor %i! a ' (((0o!ms -C )olmeer conneced across is erminals. 8!e
generaor !as an armaure %i! 1'(( conducors !a)ing %o arallel a!s and a oal resisance o& 1((( o!ms be%een brus!es. 8!e air ga Tux is 4(#((( lines er ole. H& !e )olmeer reads 1( # a %!a seed i %ill !is reading indicaes+ 5elec one< a. 1",' rm b. 1"1' rm Hncorrec c. 1"/4 rm d. 1"' rm =eedback 8!e correc ans%er is< 1",' rm Queston /7 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e coer0loss and core0loss o& a rans&ormer o& a rans&ormer a )arious loads are as s!o%n belo%. A %!a load %ill !e e3cienc2 o& !e rans&ormer be a maximum+ 5elec one< a. \oad > '( kA# Core loss > /'( *# Coer \oss > ( * b. \oad > 4( kA# Core loss > /'( *# Coer \oss > /'( * Correc c. \oad > "( kA# Core loss > /'( *# Coer \oss > "(( * d. \oad > /( kA# Core loss > /'( *# Coer \oss > 1( * =eedback 8!e correc ans%er is< \oad > 4( kA# Core loss > /'( *# Coer \oss > /'( * Queston / Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ''(0 s!un moor deli)ers 4( ! on &ull0load a 9"( rm and !as an e3cienc2 o& $. 8!e armaure and Ield resisances are (.' o!m and 1 1( o!ms# resect)el2. -eermine !e sartng resisance suc! !a !e sartng armaure curren does no exceed 1., tmes !e &ull0load curren. 5elec one< a. (.71' o!m b. (.7/' o!m c. (.7(4 o!m Correc d. (.7/9 o!m =eedback 8!e correc ans%er is< (.7(4 o!m Queston /9 Correc Mark 1.(( ou o& 1.(( o Tagged=lag ueston Queston ex A !ree0 !ase alernaor !as , slos er ole er !ase. -eermine !e disributon &acor. 5elec one< a. (.977 b. (.94 c. (.9", Correc d. (.9,/ =eedback 8!e correc ans%er is< (.9", Queston 4( Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A !ree0!ase roar2 con)erer deli)ers 1"( A a "(( dc. -eermine !e curren on !e AC side i& !e oeratng o%er &acor o& !e mac!ine is (. and !e e3cienc2 is 9($ 5elec one< a. 1"7 A Hncorrec b. 19 A c. 179 A d. 19, A =eedback 8!e correc ans%er is< 19, A Queston 41 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A ,( MA# ,9./0k# !ree !ase s2nc!ronous generaor !as a s2nc!ronous reacance o& 1" o!ms er !ase and negligible armaure resisance. 8!e generaor is deli)ering rae o%er a ($ o%er &acor lagging a raed erminal )olage o an inInie bus0bar. H& !e generaed em& is /, k er !ase# %!a is !e maximum !ree !ase o%er !a !e generaor an deli)er be&ore losing is s2nc!ronism. 5elec one< a. /'( M* b. 9, M* Hncorrec c. ' M* d. 1'( M* =eedback 8!e correc ans%er is< ' M* Queston 4' Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A d.c. moor de)elos a orue o& '(( 0m a '" rs. A '( rs# i %ill de)elo a orue o& 0m. 5elec one< a. '(( b. 1' Hncorrec c. '"( d. 1,( =eedback 8!e correc ans%er is< '(( Queston 4/ Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( )ols. 8!e armaure resisance is (.(,1 o!m. *!a is !e armaure curren+ 5elec one< a. 91." Ameres b. 9,.1" Ameres c. 9".1 Ameres Hncorrec d. 9.1" Ameres =eedback 8!e correc ans%er is< 9.1" Ameres Queston 44 Hncorrec Mark (.(( ou o& 1.(( o Tagged=lag ueston Queston ex 8!e rato o& !e rimar2 o secondar2 )olage o& a rans&ormer is ' Eb G HaRa > Eb D HaRa Eb > G HaRa Eb > D HaRa 1"". Conditon &or maximum o%er ouu &or a dc moor is A. Eb > B. Eb > K' C. Eb > HaRa -. Eb > HaRaK' 1",. 8!e seed o& a moor is A. B. C. -. direcl2 roortonal o back em& and in)ersel2 roortonal o Tux in)ersel2 roortonal o back em& and direcl2 roortonal o Tux direcl2 roortonal o back em& as %ell as Tux in)ersel2 roortonal o back em& as %ell as Tux 1"7. 8!e !ig!es seed a@ained b2 a s!un moor is A. B. C. -. eual o inIni2 o& raed Tux !ig!er !an no load seed a raed Tux eual o no load seed a raed Tux lo%er !an no load seed a raed Tux 1". Hn dc moor iron losses occur in A. B. C. -. !e 2oke !e armaure !e Ield none o& !e abo)e 1"9. 8!e dumm2 coil in a dc mac!ines is used o A. B. C. -. eliminae reacance )olage eliminae armaure reacton bring abou mec!anical balance o& armaure eliminae !armonics de)eloed in !e mac!ine 1,(. An exernal resisance is added in !e series %i! !e Ield o& a dc s!un moor. *!en !e moor runs# !e eec o& resisance is A. o reduce !e seed o& !e moor B. o increase !e seed o& !e moor C. o reduce !e armaure curren dra%n b2 !e moor -. o reduce !e losses 1,1. 8!e seed o& a dc s!un moor is reuired o be more !an =.\. seed. 8!is is ossible b2 A. increasing !e armaure curren B. decreasing !e armaure curren C. increasing !e exciaton curren -. reducing !e Ield curren 1,'. H& seed o& a dc s!un moor increases# !e back em& A. increases B. decreases C. remains consan -. decreases and !en increases Fnsol)ed roblems 1,/. REE Board Exam Aril '((' A cerain s!un moor armaure !as a resisance o& (.7( o!m and curren o& "( ameres a 1'( )ols. -eermine !e counerem&. A. 1(." C. 11'.' B. 11,." -. 11./ 1,4. REE Board Exam Aril '((1 A -C s!un moor de)elos 1" ! a 1'( . 8!e armaure e3cienc2 is 9"$. *!a is !e armaure eect)e resisance+ A. (.1( o!m C. (.( o!m B. (.(, o!m -. (.,( o!m 1,". REE Board Exam Aril '((1 A -C s!un moor de)elos 1" ! a 1'( . H& !e eect)e armaure resisance is (.((1 o!m and !e Ield %inding dra%s ' ameres# %!a is !e o)erall e3cienc2+ A. 9($ C. 9"$ B. 9/$ -. 94$ 1,,. A , ole la %ound s!un moor akes /(( A %!en !e seed is "(( rm. 8!e Tux er ole is (.(, *b and !e armaure !as a 7( conducors. eglectng !e s!un Ield curren# calculae !e ouu !orseo%er o& !e moor. Assume a consan loss o& 4$. A. 17" ! C. 17' ! B. 1, ! -. 1," ! 1,7. A raed load# a s!un moor dra%s an armaure curren o& "( A &rom a '/( dc mains %!ile running a 1((( rm. A no0 load !e armaure curren dros o " A. H& !e eec o& armaure reacton !as %eaken !e Tux b2 '$ &rom noload o &ull0load# deermine seed o& !e moor a no0load. Assume !e armaure resisance o be (.1" o!m. A. 1'(' rm C. 11'' rm B. 1''1 rm -. 1(1( rm 1,. A simlex la %ound armaure !as
"( conducors and carries a curren o& 1'" amere er armaure curren a!. H& !e Tux er ole is '( m*b# calculae !e elecromagnetc orue de)eloed b2 !e armaure. A. '1(.,4 0m B. '"'.7' 0m C. '/(.77 0m -. '(7.,/ 0m 1,9. A 1((0)ol s!un moor is de)eloing , ! %!ile oeratng a an o)er0all e3cienc2 o& ,$. 8!e armaure and s!un Ield resisances are (.(, and "( o!ms resect)el2. -eermine !e sra2 o%er losses. A. /7 * C. /9' * B. /,7 * -. /,4 * 17(. A long s!un comound moor akes a curren o& 4' A &rom a '/( source. Armaure# series Ield and s!un Ield resisances are (.1 o!m# (.' o!m and "( o!ms resect)el2. H& !e &ricton and %indage losses amoun o 4(( *# deermine !e o)er0all e3cienc2 o& !e mac!ine. A. '.'4$ C. 1.''$ B. (.""$ -. 79."/$ 171. Hnerole %indings in direc curren moors are used rimaril2 A. as means &or )ar2ing !e seed o& !e moor B. o reduce !e eec o& armaure reacton C. increase !e e3cienc2 o& !e moor -. o comensae &or Ield leakage 17'. Hn a series moor# %!a is !e relaton o& !e connecton o& moor Ield %inding %i! resec o !e moor armaure+ A. series B. arallel C. series0arallel -. dela 179. A "(( s!un moor running a 7'( rm akes an armaure curren o& "( A. 8!e eui)alen armaure resisance is (.4 o!m. *!a resisance mus be laced in series %i! !e armaure o reduce !e seed o "4( rm %!ile mainaining !e same orue+ A. '.' o!ms C. '.4 o!ms B. '., o!ms -. '. o!ms 17/. A ''( s!un moor dri)ing is normal load dra%s an armaure curren o& " ( A &rom a ''( dc source. 8!e armaure resisance o& !is moor including brus!es is (.'" o!m. 6o% muc! armaure curren minimumP %ill !is moor dra% &rom a '(( dc source %!en dri)ing !e same load %i! !e Ield ad;used o mainain !e same seed+ A. "".7, A C. ,(.1' A B. ".'4 A -. ,/.4 A 1(. A 4(( series moor !as a Ield resisance o& (.' o!m and an armaure resisance o& (.1 o!m. 8!e moor akes /( A o& curren a 1((( rm %!ile de)eloing &ull0load orue. *!a is !e moor seed %!en !is moor de)elos ,($ o& &ull load orue+ A. 1/('.4 rm B. 1'"7.' rm C. 1'97., rm -. 11/"." rm 174. A -C s!un moor runs a ,(( rm on a '4(0 )ol sul2 %!ile dra%ing a line curren o& /( A. Hs armaure and Ield resisances are (." and 1'( resect)el2. *!a resisance s!ould be laced in se ries %i! !e armaure circui in order o reduce !e seed o 4(( rm. Assume no c!anges in !e armaure or Ield curren. A. '.,9 C. '.(7 B. '.41 -. './ 11. 8!e Ield and armaure resisances o& a ''(0 series moor are (.' o!m and (.1 o!m# resect)el2. 8!e moor akes /( A o& curren %!ile running a 7(( rm. H& !e oal iron and &ricton losses are /"( *# deermine !e moor e3cienc2. A. 9(.,$ C. 9.4$ B. 91."$ -. 9'.'$ 17". A 1'(0 s!un moor !as an armaure eui)alen o& (." and a Ield resisance o& ,( . A &ull load# !e moor akes 1( A and !e seed is 1((( rm. A %!a seed mus !is moor ma2be dri)en as a generaor o deli)er 1( A o an exernal load a 1'( + A. 11" rm C. 1',' rm B. 1(, rm -. 1(4" rm 1'. 8!e inu curren o a ''( # s!or s!un comound moor a no0load is , A. 8!e s!un Ield circui resisance is ''( o!ms# !e armaure resisance is (.1( o!m and !e series Ield resisance is (.( o!m. *!a is !e sra2 o%er loss+ A. 11"/./1 * C. 1'/'."4 * B. 1(,,.'' * -. 1(7/.'" * 17,. A s!un moor dra%s curren o& 4( A &rom a 1'( source and runs a 1'(( rm a raed load. 8!e armaure and Ield circui resisances are (.1 and ,( # resect)el2. -eermine !e seed o& !e moor a !al& load. Assume a brus! dro o& ' raed load and 1 !al& load. A. 11( rm C. 1'/( rm B. 1'/ rm -. 1(', rm 177. A ''(0 s!un moor deli)ers 4( ! on &ull0load a 9"( rm and !as an e3cienc2 o& $. 8!e armaure and Ield resisances are (.' o!m and 11( o!ms# resect)el2. -eermine !e sartng resisance suc! !a !e sartng armaure curren does no exceed 1., tmes !e &ull0load curren. A. (.7(4 o!m C. (.71' o!m B. (.7/' o!m -. (.7/9 o!m 1/. C. -. A. B. C. -. A. B. C. -. A. B. C. -. A. B. C. -. A. B. C. -. 14. 1". 1,. 17. A "( 6:# ""( s!un0%ound moor dra%s a line curren o& 4." A a no0load. 8!e s!un Ield resisance is '7" o!ms and !e armaure resisance exclusi)e o& !e brus!es is (./ o!m# !e brus! dro a &ull0load is ' . A &ull0load# !e moor dra%s a line curren o& 4 A. Calculae !e e3cienc2 a &ull0load. A. 9'.($ C. 91.'$ B. ."$ -. 9.9$ A. B. 17. 1. 19. A. B. C. -. A. B. C. -. 19(. A 1(( MA 1( k urbo0alernaor !as a curren limitng reacor o& (.1,' o!ms in is neural. 8!e er uni )olage o& !e reacor reacance based on !e generaor ratng is 5elec one< a. (.(" b. (." c. (.'" d. (.('" =eedback 8!e correc ans%er is< (.(" Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8%o
1"(( kA ac generaors running in arallel sulies !e oal load o& ''"( k* a (.9( .& lagging. One mac!ine is loaded o 1((( k* a (." .&. lagging. *!a is !e kA and .& o& !e o!er mac!ine+ 5elec one< a. 1//" am (.94 lagging b. 17"( am (. lagging c. 1'"( am (.7 lagging d. 47( am (.9 lagging =eedback 8!e correc ans%er is< 1//" am (.94 lagging Queston / Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A iece o& conducor 1( cm long mo)es across a magnetc Ield o& 1(#((( gauss a a )eloci2 o& 1'( cmKsec. *!a )olage aears across !e conducor+ 5elec one< a. 1'( b. (.'4 c. ,( d. (.1' =eedback 8!e correc ans%er is< (.1' Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A !ree0!ase sar conneced AC generaor is raed a '." MA# 11 k# ,( 6. 8!e generaor !as a negligible resisance and a s2nc!ronous reacance o& '( o!ms er !ase. 8o %!a )alue %ill !e erminal )olage rise %!en &ull load a ($ & lagging is s%ic!ed0o+ 5elec one< a. 1"./ k b. 14.' k c. 1/." k d. 1'.7 k =eedback 8!e correc ans%er is< 14.' k Queston " Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dc s!un moor de)elos 1" ! a 1'( . 8!e armaure e3cienc2 is 9"$. *!a is !e back em&+ 5elec one< a. 1'' )ols b. 114 )ols c. 11 )ols d. 117 )ols =eedback 8!e correc ans%er is< 114 )ols Queston , Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex *!en alied raed )olage er !ase is reduced b2 one0!al&# !e sartng orue o& a 5CHM becomes o& !e sartng orue %i! &ull )olage. 5elec one< a. /f1K'PK' b. 1K4 c. 1K'f1K'P d. 1K' =eedback 8!e correc ans%er is< 1K4 Queston 7 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex H& !ree rans&ormers in a dela0dela are deli)ering !eir raed load and one rans&ormer is remo)ed# !en o)erload and eac! o& !e remaining rans&ormer is ercen. 5elec one< a. 7/.' b. ,,.7 c. " d. 17/.' =eedback 8!e correc ans%er is< 7/.' Queston Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 44( )ol 7" ! s!un moor !as an armaure resisance o& (.1" o!m and a Ield resisance o& /"( o!ms. 8!e curren dra%n a &ull load is 1/" ameres. *!a is !e back em& in )ols+ 5elec one< a. 41"./ b. /94. c. /9./ d. 417.1 =eedback 8!e correc ans%er is< 41"./ Queston 9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A dela0conneced load inducton moor dra%s 1(( A &rom eac! line o& a !ree0!ase source and de)elos 4( lb0? orue a sandstll. =ind !e orue %!en conneced o !e same source i& !e moor is reconneced in %2e. 5elec one< a. 1/./ lb0? b. 4( lb0? c. 1'( lb0? d. none o& !ese =eedback 8!e correc ans%er is< 1/./ lb0? Queston 1( Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A series moor# !a)ing an armaure resisance o& (.1 o!m and a Ield resisance o& (.1" o!m# akes 4 A a '/( and 7'( rm. 8!e oal core and &ricton losses are ,"( *# neglectng sra20load and brus!0conac losses# calculae ouu o%er a !e s!a?. 5 elec one< a. 11./, 6: b. 1,.1/ 6: c. 11/., 6: d. 1/.1, 6: =eedback 8!e correc ans%er is< 1/.1, 6: Queston 11 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 4#4(( )ol# ,( 6 rans&ormer !as a core loss o& 4( *a@s# o& %!ic! one0!ird is edd20curren loss. -eermine !e core loss o& !is rans&ormer %!en i is conneced o a 4#,(( ols# "( 6. 5elec one< a. 779 *a@s b. 977 *a@s c. 79 *a@s d. ,79 *a@s =eedback 8!e correc ans%er is< 977 *a@s Queston 1' Correc Mark 1.(( ou o& 1.(( Remo)e Tag Queston ex A !ree0!ase AC generaor is sul2ing o%er o a load o& /'(( k* a '/( )ols and a o%er &acor o& ,($. Assume !a !e loss o& !e line# !e generaor armaure and !e load is eual o !e 1($ o& !e load# %!a %ould be !e sa)ings in %a@s i& !e o%er &acor %ere raised o ($+ 5elec one< a. '/(#((( b. 1((#((( c. (#((( d. 14(#((( =eedback 8!e correc ans%er is< 14(#((( Queston 1/ Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 4(( series moor !as a Ield resisance o& (.' o!m and an armaure resisance o& (.1 o!m. 8!e moor akes /( A o& curren a 1((( rm %!ile de)eloing &ull0load orue. *!a is !e moor seed %!en !is moor de)elos ,($ o& &ull load orue+ 5elec one< a. 11/"." rm b. 1'"7.' rm c. 1'97., rm d. 1/('.4 rm =eedback 8!e correc ans%er is< 1'97., rm Queston 14 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 40ole# "( 6 inducton moor oeraes a "$ sli. 8!e &reuenc2 o& em& induced in !e roor %ill be 5elec one< a. '." 6 b. '" 6 c. none o& !ese d. "( 6 =eedback 8!e correc ans%er is< '." 6 Queston 1" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An ( k*# 44( )ols# /0!ase# 0conneced# ,( 6# 40ole s2nc!ronous moor !as a s2nc!ronous reacance o& /0o!m er !ase. Calculae !e orue in e%on0
meer i& i is oeratng a raed conditon a 9'$ e3cienc2. 5elec one< a. 4,1 b. 1/" c. "71 d. 714 =eedback 8!e correc ans%er is< 4,1 Queston 1, Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex An auorans&ormer !a)ing a rans&ormaton rato o& (. sulies a load o& / k*. 8!e o%er rans&erred conduct)el2 &rom rimar2 o secondar2 is k*. 5elec one< a. (., b. 1." c. (.'7 d. '.4 =eedback 8!e correc ans%er is< '.4 Queston 17 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Hn a 4 ole# "4 slo d.c. armaure# calculae !e coil san. 5elec one< a. 1/ b. 14 c. 9 d. 1 =eedback 8!e correc ans%er is< 1/ Queston 1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex Calculae !e e3cienc2 o& a '((0# 1((0k* s!un generaor i& !e resisance o& !e armaure and s!un resect)el2 are (.((" o!m and '( o!ms. 8!e &ricton# %indage and iron losses oge!er amoun o /#((( *. 5elec one< a. 9".$ b. 9'.$ c. 9.($ d. 94.($ =eedback 8!e correc ans%er is< 94.($ Queston 19 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A 1(( kA# 4(( )ol# %2e conneced salien ole s2nc!ronous generaor runs a &ull load and ($ o%er &acor leading. H& [d > '[ > 1.1 er !ase and Ra is negligible# calculae !e )olage regulaton. 5elec one< a. 0'4,$ b. 0'4.,$ c. 0',.4$ d. 0,4.'$ =eedback 8!e correc ans%er is< 0',.4$ Queston '( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex 8%o identcal s!un generaors running in arallel sul2 a oal load curren o& '"(( A. Eac! mac!ine !as a Ield resisance o& "( o!ms and an armaure resisance o& (.(1 o!m. 8!e induced em&s generaed are '/( and '/" )ols# resect)el2. Calculae !e common oeratng )olage o& eac! mac!ine. 5elec one< a. ''/ b. ''( c. '1 d. ''' =eedback 8!e correc ans%er is< ''( Queston '1 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor deli)ers 19" A a a erminal )olage o& '"( . 8!e armaure resisance and !e s!un Ield resisance are (.(' and (.(" o!m resect)el2. 8!e iron and !e &ricton losses are eual o 9"( *. =ind !e elecrical e3cienc2. 5elec one< a. 97./$ b. 9.'$ c. 9".9$ d. 9/."$ =eedback 8!e correc ans%er is< 9".9$ Queston '' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A '" kA# single !ase rans&ormer !e core loss and &ull load coer loss are /'( and /( %a@s resect)el2. *!a is !e e3cienc2 a !al& load and (.,, o%er &acor+ 5elec one< a. 9,./$ b. 9"./$ c. 97.$ d. 94.7$ =eedback 8!e correc ans%er is< 9,./$ Queston '/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A seed0indicatng de)ice consiss o& a '0ole ermanen magne -C generaor %i! a '(((0o!ms -C )olmeer conneced across is erminals. 8!e generaor !as an armaure %i! 1'(( conducors !a)ing %o arallel a!s and a oal resisance o& 1((( o!ms be%een brus!es. 8!e air ga Tux is 4(#((( lines er ole. H& !e )olmeer reads 1( # a %!a seed i %ill !is reading indicaes+ 5elec one< a. 1"' rm b. 1"1' rm c. 1",' rm d. 1"/4 rm =eedback 8!e correc ans%er is< 1",' rm Queston '4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e seed o& a moor0generaor se consistng o& a ,0ole inducton moor and a 4ole dc generaor &ed &rom a /0!ase. 5elec one< a. 1"(( b. /((( c. ,(( d. 1((( =eedback 8!e correc ans%er is< ,(( Queston '" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# !e iron loss o& !e rans&ormer a raed )olage bu "( 6 %ould be %a@. 5elec one< a. 1(( b. ( c. ,4( d. 1.'" =eedback 8!e correc ans%er is< ,4( Queston ', Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An e ig! ole %ound roor inducton moor oeratng on ,( 6 sul2 is dri)en a 1(( r..m. b2 a rime mo)er in !e oosie directon o& re)ol)ing magnetc Ield. 8!e &reuenc2 o& roor curren is 5elec one< a. ,( 6 b. none o& !e abo)e c. 1'( 6 d. 1( 6 =eedback 8!e correc ans%er is< 1( 6 Queston '7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A /0 !ase# 0ole generaor is dela conneced. 8!e erminal )olage is '4(( %!ile !e line curren is "(( ameres. H& !e mac!ine is con)ered o %2e# %!a %ill be !e erminal )olage in )ols+ 5elec one< a. /(( b. 41"7 c. 4(( d. 4,(( =eedback 8!e correc ans%er is< 41"7 Queston ' Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex An oen dela bank# consistng o& %o0single !ase rans&ormers is oeratng %i! balanced !ree0!ase load o& "( kA# 44( a (. & lagging and a single !ase load o& 1( k* resist)e conneced across c0a leg. -eermine !e minimum ratngs o& !e rans&ormers. Assume a !ase seuence o& a0b0c. 5elec one< a. /.( kA# /4.(, kA b. /4./' kA# //.4(
kA c. /(./ kA# /9."' kA d. /".4 kA# /,./4 kA =eedback 8!e correc ans%er is< /.( kA# /4.(, kA Queston '9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A s2nc!ronous moor oeraes contnuousl2 on !e &ollo%ing du2 c2cle< "( ! &or 1( sec# 1(( ! &or 1( sec# 1"( ! &or " sec# 1'( ! &or '( sec# idling &or 14 sec. *!a %ould be !e sie o& moor o be used+ 5elec one< a. 1'( ! b. 9( ! c. 1(( ! d. 1"( ! =eedback 8!e correc ans%er is< 1(( ! Queston /( o ans%ered Marked ou o& 1.(( =lag ueston Queston ex 8o ge !e armaure resisance o& a 1(( M*# 1/.9 k and 9($ o%er &acor generaor# %o erminals are conneced o a -C source. 8!e measured curren and )olage are 7., ameres and , )ols resect)el2. *!a is !e -C resisance er !ase+ 5elec one< a. (.(/4' o!m b. (.(''/ o!m c. (.(,17 o!m d. (.(," o!m =eedback 8!e correc ans%er is< (.(/4' o!m Queston /1 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e losses in a ''( # !ree0!ase# '" 6# 40ole inducton moor a &ull0load are as &ollo%s< Core > /.($# =ricton and %indage > '.($# 5aor Cu loss > 4.($# Roor Cu loss > '.($# A 7($ o& &ull0load o& !e mac!ine# deermine is seed and e3cienc2 5elec one< a. 74( rm and 9.1$ b. 1#'(( rm and 9.1$ c. 1#(( rm and 7.9/$ d. 1#17( rm and .7$ =eedback 8!e correc ans%er is< 74( rm and 9.1$ Queston /' Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex As comared o dela0dela bank# !e caaci2 o& !e 0 bank o& rans&ormers is ercen. 5elec one< a. ,., b. ,,.7 c. "7.7 d. "( =eedback 8!e correc ans%er is< "7.7 Queston // Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A "(0k*# '"(0 s!or0s!un comound generaor !as !e &ollo%ing daa< Ra > (.(, o!m# Rse > (.(4 o!m and R& > 1'" o!ms. Calculae !e induced armaure )olage a raed load and erminal )olage. 8ake ' as !e oal brus!0 conac dro. 5elec one< a. ',.'4 b. '74.1' c. '7(.1' d. '7'.1' =eedback 8!e correc ans%er is< '7'.1' Queston /4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex =ind unloaded ouu o& a o%er sul2 !a)ing a rans&ormer regulaton o& 11.1($ and 9(( load ouu. 5elec one< a. 9( b. 9(( c. 99.99 d. 999.9 =eedback 8!e correc ans%er is< 999.9 Queston /" Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e lo% side o& a cerain %elding rans&ormer !as ' urns and deli)ers /(( A. H& !e !ig! )olage side !as /( urns# !o% muc! curren lo%s !roug! i+ 5elec one< a. '( A b. 1' A c. 1" A d. 1( A =eedback 8!e correc ans%er is< '( A Queston /, Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A single0!ase roar2 con)erer !as an ouu )olage o& 11( )ols. -eermine !e line curren in !e AC side %!en !e mac!ine deli)ers a -C ouu o& "( A. Assume !e mac!ine is oeratng %i! a & o& (." and e3cienc2 o& 9"$. 5elec one< a. '.'/ A b. 9(./4 A c. 7."7 A d. 7(.71 A =eedback 8!e correc ans%er is< 7."7 A Queston /7 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex 8!e )olage o& a 1((0k*# '"(0)ol s!un generaor rises o ',( )ols %!en !e load is remo)ed. *!a is !e &ull0load curren does !e mac!ine deli)er# and %!a is is ercen regulaton+ 5elec one< a. 4(( A# '$ b. 4(( A# 4$ c. "(( A# "$ d. /" A# /."$ =eedback 8!e correc ans%er is< 4(( A# 4$ Queston / Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A -C s!un moor !as a &ull load ratng o& 1" !# '/( )ols# "7.1 ameres# 14(( rm. 8!e armaure circui resisance is (.1/ o!m and !e Ield circui resisance is 11" o!ms. eglectng !e eec o& armaure reacton# deermine !e no0load seed. 5elec one< a. 1/( rm b. 1441 rm c. 1',4 rm d. 1/9' rm =eedback 8!e correc ans%er is< 1441 rm Queston /9 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex A 40ole# 1'0slo la %ound d.c. armaure !as ' coil sidesKslo. Assuming single urn coils and rogressi)e %inding# !e back ic! %ould be 5elec one< a. / b. 7 c. , d. " =eedback 8!e correc ans%er is< 7 Queston 4( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A ,., k# 0conneced# /0!ase alernaor !as a s2nc!ronous reacance o& , o!ms er !ase and a negligible resisance. A a cerain Ield curren !e armaure is kno%n o induce ". k er !ase. A !is exciaton# calculae !e maximum o%er !a can be roduced. 5elec one< a. 1' M* b. 9. M* c. 1( M* d. 11 M* =eedback 8!e correc ans%er is< 11 M* Queston 41 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A dc series moor de)ice 1( lbs.0? o& orue %!en !e curren is /( Am. 8!e load increased so !a !e moor curren rises o "( Am. 8!e orue no% is 5elec one< a. 1( lbs.0? b. ,4. lbs.0? c. "(( lbs.0? d. /(( lbs.0 ? =eedback 8!e correc ans%er is< "(( lbs.0? Queston 4' Correc Mark 1.(( ou o& 1.(( =lag ueston
Queston ex A dc s!un moor de)elos 1" ! a 1'( )ols. 8!e armaure resisance is (.(,1 o!m. *!a is !e armaure curren+ 5elec one< a. 9".1 Ameres b. 9,.1" Ameres c. 9.1" Ameres d. 91." Ameres =eedback 8!e correc ans%er is< 9.1" Ameres Queston 4/ Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A , ole la %ound s!un moor akes /(( A %!en !e seed is "(( rm. 8!e Tux er ole is (.(, *b and !e armaure !as a 7( conducors. eglectng !e s!un Ield curren# calculae !e ouu !orseo%er o& !e moor. Assume a consan loss o& 4$. 5elec one< a. 1," ! b. 17" ! c. 1, ! d. 17' ! =eedback 8!e correc ans%er is< 1, ! Queston 44 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un generaor sulies a load o& "#"(( * a 11( !roug! a air o& &eeder conducors !a)ing a resisance o& (.(' o!m eac!. 8!e armaure# s!un Ield resisances are (.1" o!m and "( o!ms resect)el2. =ind !e em& generaed. 5elec one< a. 1'( b. 11 c. 119 d. 1'1 =eedback 8!e correc ans%er is< 1'( Queston 4" Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex *!a is !e ercen sli o& a 40ole inducton moor i& !e ouu seed is 1#7"" rm+ 5elec one< a. / b. " c. 4 d. '." =eedback 8!e correc ans%er is< '." Queston 4, Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A s!un moor dra%s curren o& 4( A &rom a 1'( source and runs a 1'(( rm a raed load. 8!e armaure and Ield circui resisances are (.1 o!m and ,( o!ms# resect)el2. -eermine !e seed o& !e moor a !al& load. Assume a brus! dro o& ' raed load and 1 !al& load. 5elec one< a. 1(', rm b. 1'/ rm c. 1'/( rm d. 11( rm =eedback 8!e correc ans%er is< 1'/( rm Queston 47 Correc Mark 1.(( ou o& 1.(( = lag ueston Queston ex 8!e seed a %!ic! a ,0ole alernaor s!ould be dri)en o generaor "( c2cles er second is 5elec one< a. none o& !ese b. 1#"(( rm c. 1#((( rm d. "(( rm =eedback 8!e correc ans%er is< 1#((( rm Queston 4 Correc Mark 1.(( ou o& 1.(( =lag ueston Queston ex Hn a 5co@0connecton# calculae !e )alues o& !e line currens in Ameres on !e //(( )ols /0!ase side i& !e load on !e '0!ase are bo! /(( k* a 1(( ol and 7(.7$ lagging .&. 5elec one< a. ".7 b. 14." c. 1"7.' d. 14".' =eedback 8!e correc ans%er is< 14." Queston 49 Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A d.c. s!un moor de)elos 7. ! a 1'( )ol# !e armaure e3cienc2 is 9/$. *!a is !e armaure eect)e resisance+ 5elec one< a. (.(" o!m b. (.(, o!m c. ( .1 o!m d. (.1, o!m =eedback 8!e correc ans%er is< (.1, o!m Queston "( Hncorrec Mark (.(( ou o& 1.(( =lag ueston Queston ex A /0!ase# 0ole dela conneced generaor !as a line curren o& "(( ameres. H& con)ered in %2e# %!a is !e olerable curren+ 5elec one< a. '.7 A b. '4".1 A c . /71." A d. /1".' A =eedback 8!e correc ans%er is< '.7 A Queston Bank in 8rans&ormers 1. REE Board Exam Aril 1997 A single0!ase rans&ormer is raed 4#1,(0 rimar2 and '"(0 secondar2. H !as 1#"(( urns in !e rimar2 and )olage regulaton o& $. *!a s!ould be !e number o& urns in !e secondar2 %inding+ A. urns C. 9( urns B. 9' urns -. , urns '. EE Board Exam Aril 1991 A cerain rans&ormer !as a rato o& is o 1. 8!e rimar2 %inding resisance is (.(('/ Z er urn and !as 1#1"" more urns !an !e secondar2 %inding. H& !e coer loss in !e rimar2 is '($ less !an !e secondar2# Ind !e resisance o& !e secondar2 %inding. A. (.(7/ o!m C. (.(, o!m B. (.(9( o!m -. (.(4 o!m /. EE Board Exam Ocober 1991 A 1(0kA '#4((K'4( single0 !ase rans&ormer !as !e &ollo%ing resisances and leakage reacances. =ind !e rimar2 )olage reuired o roduce '4(0 a !e secondar2 erminals a &ullload %!en !e load o%er &acor is (. lagging. r1 > / o!ms x1 > 1" o!ms r' > (.(/ o!m x' > (.1" o!m A. '#4"( )ols C. '#49, )ols B. '#"7" )ols -. '#,/' )ols 4. EE Board Exam Aril 19/ A single0!ase rans&ormer raed 7" kA# ((( )ols rimar2 and '4( )ols secondar2 is gi)en !e s!or circui es. *i! !e secondar2 erminals s!or circuied# 44( )ols ,( 6P is imressed on !e rimar2# %!ic! !en dra%s raed curren and 11'" %a@s. 5ol)e &or !e ercenage imedance o& !e rans&ormer. A. ".'9$ C. "."($ B. 4.9/$ -. ".1/$ ". EE Board Exam Aril 199/ A s!or circui es %as er&ormed uon a 1(0kA# '/((K'/( )ol rans&ormer %i! !e &ollo%ing resuls< Esc > 1/7 )ols :sc > 19' * Hsc > 4./4 A. Calculae in rimar2 erms !e reacance o& !e rans&ormer. A. /1.", o!ms B. '9. o!ms C. 1(.19 o!ms -. 1'.4" o!ms ,. EE Board Exam Ocober 194 A single0!ase# '" kA# 4((K'4( )ol rans&ormer %as gi)en !e s!or circui es. *i! !e secondar2 erminals s!or0circuied# 9/.7" )ols %as alied on !e rimar2 so !a !e ammeer reads
raed curren and !e %a@meer reads 1,'.74 %a@s# all on !e rimar2 side. 5ol)e &or !e ercenage resisance o& !e rans&ormer A. 1.9"$ B. /./9$ C. -. /.('$ '.'/$ 7. EE Board Exam Aril 199( 8!e &ollo%ing daa %ere obained %!en a s!or circui es %as er&ormed uon a 1 (( kA# '4((K'4( )ols disributon rans&ormer< Esc > 7' )ols Hsc > 41., A :sc > 1#1( *. All insrumens are on !e !ig! side during !e s!or circui es. Calculae !e eui)alen resisance and reacance o& !e rans&ormer. A. (.,' o!m# 1."9 o!ms B. (.,' o!m# 1.7/ o!ms C. (.7"' o!m# 1.7/ o!ms -. (.7"' o!m# 1."9 o!ms . REE Board Exam Marc! 199 A 1/. kK4( # 1( MA !ree0!ase rans&ormer !as "$ imedance. *!a is !e imedance in o!ms re&erred o !e rimar2+ A. (.9"' o!m B. (.(/ o!m C. ".1'" o!ms -. 9.(1 o!ms 9. EE Board Exam Aril 199( B. 8!e &ollo%ing daa %ere obained %!en a s!or circui es %as er&ormed uon a 1(( kA# '4((K'4( )ols disributon rans&ormer< Esc > 7' )ols Hsc > 41., A :sc > 1#1( *. All insrumens are on !e !ig! side during !e s!or circui es. Calculae !e ercen regulaton a a o%er &acor o& (.7" lagging. A. '."4$ C. '.,'$ B. '.,$ -. '.71$ 1(. EE Board Exam Ocober 199' A '((0kA rans&ormer %i! imedance o& "$ and !e o%er &acor o& !e load is "$. 8!e rimar2 )olage is ,#((( )ols %!ile !e coer loss is " k*. =ind !e ercenage regulaton. A. ".(/$ C. 4.4/$ B. ".'1$ -. 4.(/$ 11. EE Board Exam Aril 199/ A s!or circui es %as er&ormed uon a 1(0 kA# '/((K'/( )ol rans&ormer %i! !e &ollo%ing resuls< Esc > 1/7 )ols :sc > 19' * Hsc > 4./4 A. Calculae !e ercen regulaton a a lagging o%er &acor o& (.7(7. A. ".'$ C. "./7$ B. ".""$ -. ".7'$ 1'. EE Board Exam Ocober 199' Hn a 44( # "( cKs rans&ormer# !e oal iron loss is '"(( *. *!en !e sulied .d. is ''( a '" cKs# !e corresonding loss is "( *. Calculae !e edd2 curren loss a normal &reuenc2 and .d. A. '//7 * C. '(1( * B. '1," * -. ''1, * 1/. EE Board Exam Aril 199( A "( kA# '/((K'/( )ols# ,( c2cle rans&ormer is esed in !e laboraor2 so !a is c!araceristcs ma2be deermined. 8!e sandard es reuires an oen circui es and s!or circui es. Oen Circui 8es< H > ,." A E > '/( : > 17 * 5!or Circui 8es H > '1.7 A E > 11" : > "7( * -eermine !e e3cienc2 o& !e rans&ormer a !al& load# uni2 &. A. 97.""$ C. 9.4"$ B. 9.7($ -. 97.($ 14. EE Board Exam Aril 199' i)en !a !e &ull load coer losses are exacl2 %ice !e iron losses in a "( kA rans&ormer# and !a !e uarer load e3cienc2 is 9,."$# calculae !e &ull load e3cienc2 a uni2 o%er &acor. A. 97.4$ C. 97.,4$ B. 9.1'$ -. 9,.'"$ 1". EE Board Exam Aril 199" 8!e core loss o& a " k A single D !ase rans&ormer %i! normal )olage alied o !e rimar2 is 7" %a@s. 8!e maximum e3cienc2 occurs a ,($ o& &ull0load kA. *!a is !e &ullload e3cienc2 o& !e rans&ormer a (.( o%er &acor+ A. 9".1,$ C. 9/./$ B. 9."'$ -. 91./,$ 1,. EE Board Exam Ocober 19(# Ocober 19' A '"0k A disributon rans&ormer oeraes a 1'($ load# (./ & lagging &or 1 !our ar &ull0load# (.9 lagging & &or / !ours "($ load a uni2 & &or !ours and 1($ load a (. leading & &or !e res o& !e da2. H& core loss is 1"( %a@s and &ull load coer loss is "(( *# %!a is !e all0da2 e3cienc2 o& !e rans&ormer+ A. 94.'/$ C. 97.14$ B. 9'.,$ -. 9,.,$ 17. EE Board Exam Ocober 199( =ind !e all0da2 e3cienc2 o& a rans&ormer !a)ing maximum e3cienc2 o& 9$ a 1"0kA a uni2 o%er &acor and loaded as &ollo%s< 1' !ours '0k* a (." & lagging , !ours 1'0k* a (. & lagging , !ours a no load A. 9"./$ C. 94.,$ B. 91.7$ -. 9/./$ 1. EE Board Exam Ocober 1991 A /(0kA# '#4((K'4( )ols# ,(06 rans&ormer !as a &ull0load o%er o& uni2 o)er !e eriod o& '4 !rs. 8!e maximum e3cienc2 is 9"$ and i occurs a &ull0 load. Calculae !e all0da2 e3cienc2 i& loaded as &ollo%s< ,0!ours a &ull0load , !ours a uarer load A . 91."/$ C. 9(./7$ B. 9'.4"$ -. 9/.,$ 19. EE Board Exam Aril 199" Hdeal rans&ormer assumtons do no include A. no leakage Tux B. no sauraton o& core C. ero resisance o& !e %inding -. ero reacance o& !e %inding '(. EE Board Exam Ocober 199/ A rans&ormer is designed o carr2 /( tmes is raed curren &or 1 second. 8!e leng! o& tme !a a curren o& '( tmes !e raed curren can be allo%ed o To% is A. (.,7 sec C. 1." sec B. ' sec -. '.'" sec '1. REE Board Exam Ocober 199 *!ic! o& !e &ollo%ing gi)en belo% is !e edd2 curren loss no roortonal o+ A. suare o& !e !ickness B . suare o& !e &reuenc2 C. suare o& !e load curren o& !e laminaed core -. suare o& !e Tux densi2 ''. REE Board Exam Ocober 1997 A small single rans&ormer !as 1(.' %a@s no load loss. 8!e core !as a )olume o& 7"( cu. cm. 8!e maximum Tux densi2 is 1(#((( gauss and !e 04 !2seresis consan o& core is " x 1( .
Fsing !e 5einme la% o Ind !e !2seresis# deermine !e edd2 curren loss. A. 4."" %a@s C. /."" %a@s B. "."" %a@s -. '."" %a@s '/. EE B oard Exam Aril 199' *!en !e em& in !e %o %indings o& a rans&ormer are oosie in directon# !e olari2 is A. osit)e C. negat)e B. addit)e -. subract)e '4. EE Board Exam Ocober 1991 8!e coer loss o& !e rans&ormer %ill A. no be aeced b2 a c!ange in !e o%er &acor B. decrease %i! a lo%ering o& !e o%er &acor C. increase %i! an increase o& !e o%er &acor -. increase %i! !e lo%ering o& !e o%er &acor '". EE Board Exam Nune 199( :o%er los due o alernatng magnetaton and demagnetaton o& !e core maerial A. coer loss B. edd2 curren loss C. !2seresis loss -. r!eosa loss ',. EE Board Exam Nune 199( Hn !e oen circui es o& !e rans&ormer !e %a@meer reading is eual o A. edd2 curren loss B. curren loss C. !2seresis loss -. core loss '7. EE Board Exam Ocober 1991 A /(0kA '#4((K'4( )ols# ,(06 rans&ormer !as a &ull0load o%er o& uni2 o)er !e eriod o& '4 !rs. 8!e maximum e3cienc2 is 9"$ and i occurs a &ull0load. Calculae !e all0da2 e3cienc2 i& loaded ,0!ours a &ull0load. A. 7.9($ C. 9.,7$ B. ./$ -. 9'.4"$ '. EE Board Exam Aril 1991 A cerain rans&ormer !as a rato o& (.1 o!m %!en re&erred o secondar2 becomes o!m. A. (." C. (.((4 B. (.(' -. '." 47. A rans&ormer !as negat)e )olage regulaton %!en is o%er &acor is A. ero B. uni2 C. -. leading lagging 4. 8!e rimar2 reason %!2 oen0circui es is er&ormed on !e rans&ormer is !a i A. dra%s su3cienl2 large no0load curren &or con)enien con)enien reading B. reuires leas )olage o er&orm !e es C. needs minimum o%er inu -. in)ol)es in)ol)es less core loss 49. o0load es on a rans&ormer rans&ormer is carried ou o deermine A. coer loss B. magneting curren C. magneting c urren and no0load loss -. e3cienc2 o& !e rans&ormer "(. 8!e main urose o& er&orming oen0circui es on a rans&ormer rans&ormer is o measure is A. Cu loss B. core loss C. oal loss -. insulaton resisance resisance "1. -uring s!or0 circui es# !e iron lose o& a rans&ormer is negligible because A. !e e ntre inu is ;us su3cien o mee Cu losses onl2 B. Tux roduced is a small &racton o& !e normal Tux C. iron core becomes &ull2 sauraed -. sul2 sul2 &reuenc2 is !eld consan "'. 8!e iron loss o& a rans&ormer a 4(( 6 is 1( *. Assuming !a edd2 curren and !2seresis losses )ar2 as !e suare o& Tux densi2# densi2# !e iron loss o& !e rans&ormer rans&ormer a raed )olage bu "( 6 %ould be %a@. A. ( C. 1.'" B. ,4( -. 1(( "/. Hn oeratng a 4(( 6 rans&ormer a "( 6 A. B. C. -. onl2 )olage is reduced in !e same roorton as !e &reuenc2 onl2 kA ratng is reduced in !e same roorton as !e &reuenc2 bo! )olage and kA ratng are reduced in !e same roorton as !e &reuenc2 none o& !e abo)e "4. 8!e )olage alied o !e !.). !.). side o& a rans&ormer during s!or0circui es is '$ o& is raed )olage. 8!e core loss %ill be ercen o& !e raed core loss. A. 4 C. (.'" B. (.4 -. (.(4 "". 8rans&ormers 8rans&ormers are raed in kA insead o& k* because A. load o%er &acor is o?en no kno% B. kA is Ixed %!ereas k* deends on load .&. .&. C. oal rans&ormer rans&ormer loss deends on )olamere -. i !as become cusomar2 ",. *!en a 4(( 6 rans&ormer is oeraed is kA ratng is A. reduced o 1K B. increased tmes C. unaeced -. increased ,4 tmes "7. A relat)el2 lig! loads# rans&ormer rans&ormer e3cienc2 is lo% because A. secondar2 ouu is lo% B. rans&ormer losses are !ig! C. Ixed loss is !ig! in roorton o !e ouu -. Cu loss is small ". A '(( kA rans&ormer !as an iron loss o& 1 k* and &ull0load Cu loss o& ' k*. Hs load kA corresonding o maximum e3cienc2 is kA. A. 1(( C. "( B. '(( -. 141.4 "9. H& Cu loss o& a rans&ormer a 7K! &ull0 load is 49(( *# !en is &ull0load Cu loss %ould be %a@. A. ",(( C. /7" B. ,4(( -. 4'9 ,(. 8!e ordinar2 e3cienc2 o& a gi)en rans&ormer is maximum %!en A. i runs a !al& &ull0load B. i runs a &ull0 load C. is Cu loss euals iron loss -. i runs slig!l2 o)erload ,1. 8!e ouu curren corresonding o maximum e3cienc2 &or a rans&ormer !a)ing core loss o& 1(( * and eui)alen resisance re&erred re&erred o secondar2 o& (.'" is amere. A. '( C. " B. '" -. 4(( ,'. 8!e maximum e3cienc2 o& a 1((0kA 1((0kA rans&ormer rans&ormer !a)ing iron loss o& 9(( k* and =.\. Cu loss o& 1,(( * occurs a kA. A. ",./ C. 7" B. B. 1//./ -. 177.7 ,/. 8!e all0da2 e3cienc2 o& a rans&ormer deends rimaril2 on A. is coer loss B. !e amoun o& load C. !e duraton o& load -. bo! B and C ,4. 8!e marked increase in kA caaci2 roduced b2 connectng a ' %inding rans&ormer rans&ormer as an auorans&ormer auorans&ormer is due o A. increase in urn rato B. increase in secondar2 )olage C. increase in rans&ormer rans&ormer e3cienc2 -. esablis!men o& conduct)e link be%een rimar2 and secondar2 ,". 8!e kA ratng o& an ordinar2 '0%inding . rans&ormer is increased %!en conneced as an auorans&ormer because A. rans&ormaton rato is increased B. secondar2 )olage is increased C. energ2 is rans&erred bo! induct)el2 and conduct)i2 -. secondar2 curren is increased ,,. 8!e sa)ing in Cu ac!ie)ed b2 con)ertng '0 %inding rans&ormer ino an auorans&ormer is deermined b2 A. )olage rans&ormaton rans&ormaton rato B. load on !e secondar2 C. magnetc uali2 o& core maerial -. sie o& !e rans&ormer core ,7. An auorans&ormer !a)ing a rans&ormaton rato o& (. sulies a load o& / k*. k*. 8!e o%er rans&erred conduct)el2 &rom rimar2 o secondar2 is k*. k*. A. (., C. 1." B. '.4 -. (.'7 ,. 8!e essental conditon &or arallel oeraton o& %o 10J rans&ormer is !a !e2 s!ould !a)e !e same A. olari2 B. kA ratng C. )olage -. ercenage imedance ,9. H& !e imedance riangles o& %o rans&ormers oeratng in arallel are no identcal in s!ae and sie# !e %o rans&ormers rans&ormers %ill A. s!are !e load uneuall2 B. ge !eaed uneuall2 C. !a)e a circulaor2 secondar2 curren e)en %!en unloaded -. run %i! dieren o%er &acors 7(. 8%o rans&ormers rans&ormers A and B !a)ing
eual ouus and )olage ratos bu uneual ercenage imedances o& 4 and ' are oeratng in arallel. 8rans&ormer 8rans&ormer A %ill be running o)er0load b2 ercen. A. "( C. // B. ,, -. '" Fnsol)ed roblems 71. EE Board Exam Ocober 1991# Aril 1994 A 1((( kA# ,#,((K4(( )ols ,( c2cle single !ase core 2e rans&ormer rans&ormer !as !e &ollo%ing a)erage a)erage dail2 load< =ull0load a (. & &or !ours 6al&0load a (.7(7 & &or 1( !ours o0load &or , !ours Calculae !e rato o& &ull0load coer loss o !e iron loss &or !e rans&ormer rans&ormer o be mos economical &or !e abo)e loading. A. '.(" C. '.17 B. /.(9 -. '.' 86REE :6A5E 8RA5=ORMER COEC8HO5 7'. EE Board Exam Nune 199( *!a s!ould be !e A ratng o& eac! %o rans&ormers rans&ormers in an oen0dela bank %!en !e !ree0!ase balanced load is '9(.4 kA+ kA+ A. 1"".,( kA B. 17/.4( kA C. 1"(.'" kA -. 1,7.,, kA 7/. EE Board Exam Aril 191 A 0 or oen dela conneced rans&ormer rans&ormer bank# comosed o& %o identcal unis ser)es a balanced /0!ase load o& 1, kA a '/( )ols. 5ol)e &or !e minimum sie in kA o& !e rans&ormers needed. A. kA C. 1, kA B. 9.'4 kA -. .'" kA 74. EE Board Exam Aril 19, A 0 oen delaP conneced rans&ormer bank ser)es a balanced /0!ase load o& 4( kA a '/( and (.,, & lagging. 5ol)e &or !e minimum kA o& eac! rans&ormer rans&ormer needed o accommodae !e load %i!ou o)erloading. A. '" C. '/ B. '4 -. '( 7". EE Board Exam Aril 19" 8%o single0!ase disributon rans&ormers rans&ormers are banked in 0 oen delaP. H& eac! rans&ormer is raed /7." kA# sol)e &or !e maximum /0!ase load !a !e bank can carr2 %i!ou o)erloading# considering !a !e load !as a o%er &acor o& (." lagging. A. "'." k* C. "/., k* B. 49." k* -. "".' k* 7,. EE Board Exam Aril 19( 8%o single0!ase disributon rans&ormers rans&ormers conneced in oen dela %ill sul2 o%er o a '(( !# /0!ase inducton moor# moor# oeratng a (.7( o%er &acor and (.9( e3cienc2. e3cienc2. 5ol)e &or !e minimum sie in kA o& eac! rans&ormer needed o sul2 !e o%er %i!ou being o)erloaded. A. 1/,.7/ kA B. 1'4.4" kA C. 1/(./ kA -. 1'9.4 kA kA 77. EE Board Exam Ocober 19, 8!e Ftli2 Coman2 sulies %o single0!ase rans&ormers banked banked in oen dela. H& eac! rans&ormer rans&ormer is raed 7" kA caaci2# %!a is !e maximum /0!ase load in kilo%a@s !a !e bank can carr2 %i!ou suering o)erload considering !a !e load !as a lagging o%er &acor o& (.(. A. 1(4 k* C. 1/( k* B. 11' k* -. 114 k* 7. EE Board Exam Ocober 19( 8%o identcal 10!ase rans&ormers conneced in oen dela %ill ser)e a /0!ase moor lad o& '"( !# (.7( & lagging# (.9( e3cienc2. 5ol)e &or !e minimum sie in kA o& eac! rans&ormer reuired o ser)e !e load %i!ou o)erloading. A. 1"(.// C. 1,(.4/ B. 17(.91 -. 1".1/ 79. EE Board Exam Ocober 19"# Aril 19, An oen0dela conneced rans&ormer rans&ormer bank ser)es a balanced /0!ase load o& 4( kA a '/( and (.,, & lagging. 5ol)e &or !e real o%er and a %!ic! eac! rans&ormer rans&ormer is oeratng. A. 11."4 k* a (." & and '/.(9 k* a uni2 & B. 1'.'' k* a (." & and ''.4' a uni2 & C. 11."4 k* a (.,, & and '/.(9 k* a (.7(7 & -. 1'.'' k* a (.,, & and ''.4'9 k* a (.7(7 & (. EE Board Exam Aril 19/ 8%o single0!ase rans&ormers rans&ormers are conneced in 0 oen delaP and ser)ing a dela conneced imedance load %i! eac! imedance eual o o!ms. H& !e rans&ormer )olages imressed imressed on !e rans&ormer rans&ormer are< 5ol)e &or !e kA deli)ered b2 eac! rans&ormer. rans&ormer. A. 7.' and ".'( B. ".7 and ,.,1 C. ,.4 and ".,4 -. ,.'4 and ,.'4 1. EE Board Exam Nune 199( 8%o single0!ase rans&ormers rans&ormers in an oen dela bank ser)ed a !ree0 !ase balanced load o& '9(.4 kA. H& a !ird rans&ormer is added &or dela oeraton# %!a ercen increase in load does !is reresen+ A. 7/.'$ C. (."$ B. 4.,$ -. 79.4$ '. EE Board Exam Ocober 19/ 8!ree single0!ase rans&ormers eac! raed 7" kA are banked in dela and sul2ing a /0!ase load dra%ing 1,( kA a (. lagging o%er &acor. &acor. H& one rans&ormer is remo)ed &or reairs# sol)e &or !e amoun o& o)erloading o& !e remaining unis. A. /( kA C. '( kA B. 1( kA -. '" kA /. EE Board Exam Aril 199' A ,,((0)ol# ,( 6# '0!ase ne%ork is conneced o a !ree0!ase# 40%ire s2sem b2 a 5co@conneced rans&ormer rans&ormer combinaton. H& !ere are 1"(( urns on !e '0!ase side# calculae !e number o& urns on !e /0!ase side reuired &or !e main and easer rans&ormers. rans&ormers. olage er !ase on !e /0!ase side is '4( . A. 94 urns and / urns B. 9/ urns and 4 urns C. 9" urns and ' urns -. 9' urns and " urns 4. EE Board Exam Aril 19" A balanced /0!ase rans&ormer bank !as delaconneced rimar2 and secondar2 %indings. 8!e rimar2 o secondar2 %inding )olage rato is '4((K'77. 5ol)e &or !e rimar2 line curren i& !e lo%0side secondar2P load dra%s a line c urren o& 1(((
A. A. '(( A C. 1"( A B. 11" A -. 17" A ". EE Board Exam Ocober 1991 *!a s!ould be !e urns rato o& a !ree0!ase rans&ormer o rans&orm 1(#((( kA &rom '/( k o 41,( i& !e rans&ormer is o be conneced h D + A. 94 C. 9, B. 9 -. 97 ,. REE Board Exam Ocober 199 8!e oental rans&ormer rans&ormer o& a line !as a rato o& 1/'#(((K,,. 8!ese are conneced %2e0dela. 8!e )olmeer conneced a !e secondar2 reads ,4 )ols. *!a is !e )olage o& !e line+ A. ''1.7 k C. 11'." k B. 1/".' k -. 1/' k 7. REE Board Exam Ocober 1997 A o%er rans&ormer raed "(#((( kA# /4." kK1/. k is conneced %2e0grounded rimar2 and dela on !e secondar2. -eermine !e &ull load !ase curren on !e secondar2 side. A. '(9' A C. 1449 A B. 17'" A -. 1'( A . REE Board Exam Ocober 199 A ,9K1/ . k# k# 1( MA !ree0!ase rans&ormer rans&ormer is conneced %2e0grounded dela. *!a is !e k ratng o& !e secondar2 %inding+ A. 7.97 C. 1" B. '/.9 -. 1/. 9. REE Board Exam Ocober 1997 8!e :8s :8s o& a ''( k ransmission line !a)e a rato o& 1/'.7, kK,,./7" are conneced %2e%2e. A )olmeer conneced line o ground reads ,, )ols# %!a is !e ransmission line )olage+ A. ''.,/ k C. ''/.1" k B. ''(.1( k -. ''".'" k 9(. REE Board Exam Ocober 1997 A o%er rans&ormer rans&ormer raed "(#((( kA# /4." kK1/. k is conneced %2e0%2e. *!a are !e line currens a &ull load+ A. "'"." A# 17'".4 A B. /,.7 A# '(9' A C. 4/.1 A# 1'(7.7 A -. 1449./ A# /,'/.' A 91. EE Board Exam Ocober 19" 8%o rans&ormers are conneced in arallel o sul2 a common load o& 17" kA. 8rans&ormer A is raed 1(( kA %i! eui)alen imedance o& 9., o!ms %!ile rans&ormer B is raed 7" kA %i! eui)alen imedance o& 1'." o!ms. =ind !e kA load o& eac! rans&ormer. rans&ormer. A. 7# 97 C. (# 9" B. 7,# 99 -. 7"# 1(( 9'. EE Board Exam Ocober 191 8%o disributon rans&ormers rans&ormers are conneced in arallel sul2ing a load o& 1'" kA. H& rans&ormer A is raed "( kA# %i! 14 o!ms eui)alen reacance and rans&ormer rans&ormer B is raed 7" kA %i! 11 o!ms eui)alen reacance. 5ol)e &or !e loading o& eac! rans&ormer. A. "" kA# 7( kA B. "( kA# 7" kA C. " kA# ,7 kA -. "' kA# 7/ kA 9/. REE Board Exam Marc! 199 A 1'" kA disributon rans&ormer rans&ormer %i! 4$ imedance is conneced in arallel %i! ano!er rans&ormer raed 7" kA and %i! /"$ imedance. Bo! !a)e same )olage rato. eglec resisance o& eac! rans&ormer.P rans&ormer.P 8!e oal load is 14( kA a "$ o%er &acor. &acor. 6o% muc! load does eac! carr2+ A. (." kA# "9." kA B. 77.7 kA# ,'.'' kA C. ( kA# ,( kA -. 7."( kA# "'." kA 94. EE Board Exam Aril 199/ MERA\CO !as %o single0 !ase rans&ormers rans&ormers %i! eual urns rato and ratngs are oeraed in arallel o sul2 a load o& '( k* a (. lagging &. 8rans&ormer A !as a resisance o& '$ and a reacance o& $. 8rans&ormer B !as a resisance o& 1$ resisance and a reacance o& ,$. -eermine !e o%er deli)ered b2 !e rans&ormers rans&ormers A and B o !e load. A. A > 1'/ k*# B > 1"7 k* B. A > 1'" k*# B > 1"" k* C. A > 1'' k*# B > 1" k* -. A > 1'7 k*# k*# B > 1"/ k* 9". REE Board Exam Aril 1994 8%o single !ase rans&ormers %i! eual ratngs and urns rato are oeraed in arallel o sul2 a load o& 1( k* a a lagging & o& (.9(. 8rans&ormer 8rans&ormer A !as a resisance o& 1$ and a reacance o& ,$. 8rans&ormer 8rans&ormer B !as a resisance o& '$ ' $ and a reacance o& "$. Calculae !e o%er deli)ered b2 eac! rans&ormer. A. / k*# 97 k* B. 79 k*# 9' k* C. k*# 9' k* -. ( k*# k*# 1(( k* 9,. REE Board Exam Marc! 199 A o%er cusomer dra%s o%er a ''( )ols &rom a rans&ormer rans&ormer on a ole. Curren rans&ormers %i! rato o& '((K" are use o meer !e elecrical usage. *!a is !e multlier o& !e k* !r and demand meers+ A. 4( C. '(( B. 1(( -. ( 97. REE Board Exam Ocober 1997 A a 1"" k subsaton# !e :8 rato is 1((( and !e C8 rato is 1'((K". 8!e oental going ino !e %a@meer is 11" )ols. *!a is !e M* indicaed %!en !e %a@meer reads (( %a@s+ A. 19' M* C. 19.' M* B. 1"( M* -. 1" M* 9. REE Board Exam Marc! 199 A "( MA# // kK11 k*# !ree0 !ase# %2e0dela conneced rans&ormer !as a /$ imedance. *!a is !e $imedance a 1(( MA base and /4." k base+ A. 1.,/9$ C. ".74$ B. ".49$ -. ,.",$ 99. REE Board Exam 5eember '((1# Ocober 199 8!e loads o& a %2e0conneced rans&ormer are< Ha > 1( cis 0/(^P A Hb > 1' cis '1"^ A Hc > 1" cis '^ A *!a is !e neural curren+ A. 1.(4 cis 7'.^ A B. (.9' cis ,'."^ A C. '.'1 cis 0/(^ A -. /.11 cis 7'.^ A 1((. REE Board Exam Ocober 199 Hs rimar2 &uncton is o ro)ide ground source A. igag rans&ormer rans&ormer B. sectonalier C. surge arreser -. ertar2 rans&ormer 1(1. REE Board Exam Ocober 1997 *!a is !e main use o& a igag rans&ormer+ A. o se do%n )olage B. o ro)ide a! o ero seuence currens C. o sabilie rans&ormer seuence currens -. o se do%n curren 1('. REE Board
Exam Ocober 1997 A o%er rans&ormer is raed a "(#((( kA# /4." kK1/. k is conneced %2e0%2e# %!a are !e line currens a &ull0load+ A. "'".' ameres# 1#7'" ameres B. /,.7 ameres# '#(9' ameres C. 4/.1 ameres# 1#'(7.7 ameres -. 1#449./ ameres# /#,'/.' ameres 1( /. REE Board Exam Ocober 199, A !ree0!ase rans&ormer !as a rimar2 )olage ratng o& /4." k# %2e0conneced %i! %o '."$ as abo)e and %o '."$ as belo% !e raed )olage. 8!e secondar2 %inding is raed 4,( )ols and is dela conneced. H& i !as 1(( urns# %!a %ill be !e eect)e number o& urns in !e rimar2 %inding i& )olage a us se a minus '."$+ A. 7#1// urns C. 4#''' urns B. 7#/1' urns -. 4#/// urns 1(4. EE Board Exam Aril 19 8%o single0!ase rans&ormers eac! raed 7"kA are conneced in 0 or oen0dela# o ser)e a !ree0!ase load o& 1'( k* a (.( o%er &acor lagging. 8o re)en !e o)erloading o& rans&ormers# deermine !e sie o& !e caacior in kAR. A. "( C. /( B. 4( -. '( 1(". ECE Board Exam Aril '((1 A rans&ormer comosed o& %o or more coils %!ic! are %ound around a non0 meallic core A. Meallic core rans&ormer B. =ree core rans&ormer C. Hron core rans&ormer -. Air core rans&ormer 1(,. ECE Board Exam Aril 1999 An auorans&ormer conains !o% man2 coils+ A. one C. 8%o B. One -. 8!ree 1(7. ECE Board Exam Aril '((( =ind unloaded ouu o& a o%er sul2 !a)ing a rans&ormer regulaton o& 11.1($ and 9(( load ouu. A. 99.99 C. 999.9 B. 9( -. 9(( 1(. ECE Board Exam Aril 199 A rans&ormer consiss o& !e &ollo%ing+ A. An inducance and resisance B. A arallel resonan circui C. A caacior and an inducor -. 8%o coils %ound on a common core 1(9. ECE Board Exam Aril '((1 6o% muc! is !e secondar2 )olage o& a o%er rans&ormer %!ose arameers are as &ollo%s# rimar2 )olage is '4( ols# 14( urns in !e rimar2 and 7 urns in !e secondar2. A. 1' C. , B. '4 -. /, 11(. ECE Board Exam Aril '((( H is a rans&ormer %i! %o or more %indings on a laminaed iron core used o sul2 seed u or seed do%n )alues o& )olages o )arious circuis o& an euimen. A. R= rans&ormer B. :o%er rans&ormer C. Auorans&ormer -. A= rans&ormer 111. ECE Board Exam Aril 1999 A rans&ormer %i! 1(( urns in !e rimar2 %inding and '" urns in !e secondar2 %inding is %!ic! o& !e &ollo%ing+ A. A se0u rans&ormer B. An isolaton rans&ormer C. A se0do%n rans&ormer -. An auorans&ormer 11'. ECE Board Exam o)ember '((1 =ind !e rimar2 )olage o& a o%er rans&ormer under !e &ollo%ing conditons / urns &or rimar2# , urns &or secondar2 and 1'( )ols &or secondar2 )olage. A. )ols C. , )ols B. ,( )ols -. 1' )ols 11/. ECE Board Exam Aril 1999 8!e curren !a To%s in !e rimar2 o& a rans&ormer %i! !e secondar2 oen or no load is a@ac!edP. A. 5ource curren B. Excitng curren C. \oad curren -. Couling curren 114. ECE Board Exam Aril 199, *!a 2e o& rans&ormer !a is used o roec ec!nicians and oeraes &rom deadl2 elecrical s!ock+ A. Absorber rans&ormer B. 5e do%n rans&ormer C. 5e u rans&ormer -. Hsolaton rans&ormer 11". ECE Board Exam o)ember '((( Comonens o& !e rans&ormer %!ic! recei)es energ2 &rom !e rimar2 %inding and deli)ers i o !e load. A. Enclosure B. Core C. 5econdar2 %inding -. :rimar2 %inding 11,. ECE Board Exam o)ember 199 *!ic! o& !e &ollo%ing does no conribue o losses in a rans&ormer+ A. \eakage resisance B. 5el&0inducance C. 5ra2 caaciance -. Hron losses 117. ECE Board Exam Aril '((1 A rans&ormer comosed o& %o or more coils %!ic! are %ound around a non0meallic core A. Meallic core rans&ormer B. =ree core rans&ormer C. Air core rans&ormer -. Hron core rans&ormer 11. A rans&ormer %ill %ork on . A. a.c. onl2 B. d.c. onl2 C. a.c. as %ell as d.c. -. none o& !e abo)e 119. 8!e rimar2 and secondar2 o& a rans&ormer are couled. A. B. C. -. elecricall2 magnetcall2 elecricall2 magnetcall2 none o& !e abo)e 1'(. A rans&ormer is an e3cien de)ice because i . A. is a satc de)ice B. uses caacit)e couling C. uses induct)e couling -. uses elecric couling 1'1. A rans&ormer rans&ers elecrical energ2 &rom rimar2 o secondar2 usuall2 %i! a c!ange in . A. &reuenc2 C. )olage B. o%er -. tme eriod 1''. 8!e )olage er urn o& !e rimar2 o& a rans&ormer is !e )olage er urn o& !e secondar2. A. more !an B. less !an C. !e same as -. none o& !ese 1'/. 8!e %inding o& !e rans&ormer %i! greaer number o& urns %ill be . A. !ig!0 )olage %inding B. lo%0)olage %inding C. ei!er !ig! or lo% )olage %inding -. none o& !e abo)e 1'4. A rans&ormer does no ossess c!anging roer2. A. imedance B. )olage C. -. curren o%er 1//. 1'". 8!e iron0core is used o o& !e rans&ormer. A. increase !e %eig! B. ro)ide tg! magnetc
couling C. reduce core losses -. none o& !e abo)e 1',. H& a rans&ormer core !as air gas# !en . A. relucance o& magnetc a! is decreased B. !2seresis loss is decreased C. magneting curren is greal2 increased -. edd2 curren is increased 1'7. 8!e maximum Tux roduced in !e core o& a rans&ormer is . A. direcl2 roortonal o sul2 &reuenc2 B. in)ersel2 roortonal o sul2 &reuenc2 C. in)ersel2 roortonal o rimar2 )olage -. none o& !e abo)e 1'. 8!e Tux in !e core o& a single0!ase rans&ormer is . A. B. C. -. urel2 alernatng one urel2 roatng one arl2 alernatng and arl2 roatng none o& !e abo)e 1'9. A rans&ormer is so designed !a rimar2 and secondar2 !a)e . A. !ig! leakage Tux B. large resisance C. tg! magnetc couling -. good elecric couling 1/(. *!en !e rimar2 o& a rans&ormer is conneced o a d.c. sul2# . A. rimar2 dra%s small curren B. rimar2 leakage reacance is increased C. core losses are increased -. rimar2 ma2 burn ou 1/1. An ideal rans&ormer is one %!ic! . A. !as no losses and leakage reacance B. does no %ork C. !as !e same number o& rimar2 and secondar2 urns -. none o& !e abo)e 1/'. 8!e no0load rimar2 curren Ho is abou o& &ull0load rimar2 curren. A. / D "$ C. /( D 4($ B. 1" D /($ -. abo)e 4($ 8!e no0load .&. o& a rans&ormer is small because A. B. C. -. iron losses comonen o& Ho is large magneting comonen o& Ho is large magneting comonen o& Ho is small none o& !e abo)e 1/4. 8!e no0load inu o%er o a rans&ormer is ractcall2 eual o loss in !e rans&ormer. A. iron B. coer C. edd2 curren -. none o& !ese 1/". 8%o !ings %!ic! are same &or rimar2 and secondar2 o& a rans&ormer are . A. amere0urns and )olage er urn B. resisance and leakage reacances C. currens and induced )olages -. none o& !e abo)e 1/,. A rans&ormer oeraes oorl2 a )er2 lo% &reuencies because . A. ermeabili2 o& core is increased B. magneting curren is abnormall2 !ig! C. rimar2 reacance is oo muc! increased -. none o& !e abo)e 1/7. H& a o%er rans&ormer is oeraed a )er2 !ig! &reuencies# !en . A. rimar2 reacance is oo muc! increased B. rimar2 %ill dra% large o%er C. core losses %ill be excessi)e -. none o& !e abo)e 1/. 8!e rimar2 leakage Tux links . A. rimar2 %inding onl2 B. secondar2 %inding onl2 C. bo! rimar2 and secondar2 %inding -. none o& !e abo)e 1/9. 8!e eec o& leakage Tux in a rans&ormer is o . A. B. C. -. 14(. increase coer losses decrease coer losses cause )olage dro in !e %indings none o& !e abo)e \eakage Tux in a rans&ormer occurs because . A. iron core !as !ig! ermeabili2 B. air is no good magnetc insulaor C. alied )olage is sinusoidal -. rans&ormer is no an e3cien de)ice 141. 8!e muual Tux in a rans&ormer remains consan a all loads because . A. alied )olage and &reuenc2 are consan B. leakage Tux is small C. iron0core is used -. losses are small 14'. Cores o& large rans&ormer are buil u o nearl2 circular crosssecton in order o reduce . A. leakage reacance B. iron losses C. edd2 curren loss -. coer loss Fnsol)ed roblems 14/. REE Board Exam 5eember '((' A '( kK7.7 k auorans&ormer !as '(( A c urren in !e common %inding. *!a is !e secondar2 line curren+ A. 14/."' A C. ",.4 A B. '(( A -. /'9 A 144. REE Board Exam Aril '((4 Hnsrumen rans&ormers are used in indicatng and meering and %i! roect)e de)ices# !e2 are used &or A. measuring C. rela2ing B. deectng -. sensing 14". REE Board Exam Ocober '((( 8!e C8 rato and :8 rato used o roec a line are '4( and '((( resect)el2. H& !e imedance o& eac! line is 1( Z# %!a is !e rela2 imedance o roec !e line &rom &aul+ A. /.// Z C. 4#((( Z B. 1.' Z -. 1' Z 14,. REE Board Exam Ocober '((( 8%o single0!ase rans&ormers oerae in arallel. 8rans&ormer 1 is raed 1(( kA %i! 4$ reacance %!ile rans&ormer ' is raed 7" kA %i! /$ reacance. 8!e rans&ormers !a)e secondar2 )olages o& ''( )ols and same )olage rato. H& !e common load is 1'" kA a ($ .&. lagging# deermine !e kA s!aring o& eac! rans&ormer. A. 71.4/ ka and "/."7 kA B. 7" ka and "( kA C. ,'." kA and ,'." kA -. '." kA and 4'." kA 147. Aril '((4 REE Board Exam A rans&ormer raed '#((( kA# /4#"((K'4( )ols !as ".7"$ imedance. *!a is !e er uni imedance+ A. (.(,/" C. (.("7" B. (.(,", -. /4.' 1 4. REE Board Exam Aril '((1 A ,9 kK1/. k# 7." MA rans&ormer !as $ imedance. *!a is is imedance a 1(( MA base+ A. (.,$ C. (($ B. $ -. 1(,.7$ 149. REE Board Exam Ocober 1997 A /0!ase rans&ormer is raed /( MA# 11"hK1/. k and '$ imedance# !e resisance is negligible comared %i! !e reacance. -eermine !e ercen $P )olage dro a !e secondar2 a ($ load and a 7"$ o%er &acor. A. 4.1$ C. 1.("$ B. '.',$ -. /.1"$
1"(. *!ic! o& !e &ollo%ing connecton is bes suied &or /0!ase# 4%ire ser)ice+ A. D C. D B. D -. D 1"1. Hn a !ree0!ase D rans&ormer connecton# neural is &undamenal o !e A. suression o& !armonies B. assage o& unbalanced currens due o loads C. ro)ision o& dual elecric ser)ice -. balancing o& !ase )olages %i! resec o line )olages 1"'. As comared o D bank# !e caaci2 o& !e D bank o& rans&ormers is ercen. A. "7.7 C. "( B . ,,.7 -. ,., 1"/. H& !ree rans&ormers in a D are deli)ering !eir raed load and one rans&ormer is remo)ed# !en o)erload and eac! o& !e remaining rans&ormer is ercen. A. ,,.7 C. 7/.' B. 17/.' -. " 1"4. *!en a D s2sem is con)ered ino a D s2sem# increase in a caaci2 o& !e s2sem is ercen. A. ,., B. ,,.7 C. -. 7/.' "( 1"". =or sul2ing is a balanced /0 load o& 4(0kA# ratng o& eac! rans&ormer in D bank# s!ould be nearl2 kA. A. '( C. /4., B. '/ -. '" 1",. *!en a closedbank is con)ered ino an oen0 bank. Eac! o& !e %o remaining rans&ormer sulies ercen o& !e original load. A. ,,.7 C. "( B. "7.7 -. 7/.' 1"7. H& !e load .&. is (.,# !en !e a)erage .& o& !e 0bank is A. (., B. (.7" C. -. (."1 (.," 1". A 8 D 8 connecton !as a !ig!er rato o& utliaton !a a D connecton onl2 %!en A. identcal rans&ormers are used B. load o%er &acor is leading C. load o%er &acor is uni2 -. non0identcal rans&ormer are used 1"9. 8!e bigges ad)anage o& 8 D 8 connecton o)er !e D connecton &or /0!ase o%er rans&ormaton is !a i ro)ides A. a se o& balanced )olages under load B. a rue /0!ase# 4 %ire s2sem C. a !ig!er rato o& utliaton -. more )olages 1,(. One o& !e &ollo%ing saemens concerning arallel oeraton o& rans&ormer# !e one %!ic! is no correc is A. rans&ormers !a)e eual )olage ratngs B. rans&ormers mus !a)e same rato o& rans&ormaton C. rans&ormers mus be oeraed a !e same &reuenc2 -. rans&ormers mus !a)e eual 1,1. 5aemen. An auo0rans&ormer is more e3cien in rans&erring energ2 &rom rimar2 o secondar2 circui. Reason. Because i does so bo! induct)el2 and conduct)el2. e2 A. saemen is &alse# reason is correc and rele)an B. saemen is correc# reason is correc bu irrele)an C. bo! saemen and reason are correc and are conneced o eac! o!er as cause and eec -. bo! saemen and reason are &alse 1,'. Ou o& !e &ollo%ing gi)en c!oices &or ol2!ase rans&ormer connectons %!ic! one %ill 2ou selec &or !reeo0%o !ase con)ersion+ A. 5co@ B. sarKsar C. double 5co@ -. sarKdouble0dela 1,/. A8D8 rans&ormer canno be aralleled %i! rans&ormer. A. D C. D B. D -. D 1,4. Hnsrumen rans&ormers are used in a.c. circuis &or exending !e range o& A. ammeers B. )olmeers C. %a@meers -. all o& !e abo)e 1,". Be&ore remo)ing !e ammeer &rom !e curren rans&ormer# is secondar2 mus be s!or0circuied in order o a)oid A. excessi)e !eatng o& !e core B. !ig! secondar2 em& C. increase in iron losses -. all o& !e abo)e 1,,. rans&ormer is made o& A. silicon seel B. annealed coer C. seasoned coer -. aluminum 8!e core o& a 1,7. 8!e core o& a rans&ormer is assembled %i! laminaed s!ees o reduce A. !2seresis loss B. edd20curren loss C. magnetc noise -. magneting curren 1,. 8!e use o& grainoriened laminaed s!ees in building a rans&ormer core A. reduces magneting curren B. reduces edd20curren loss in !e core C. reduces !2seresis loss -. increases !e no0load o%er &acor angle 1,9. C ooling o& rans&ormers is necessar2 o A. increase !e e3cienc2 B. dissiae !e !ea generaed in !e %indings C. reduce !e losses -. reduce !umming 17(. 8!e em& induced in !e %indings o& a rans&ormer %ill A. lag !e core Tux b2 9( degrees B. be in0!ase %i! !e core Tux C. be ou0o&0!ase %i! !e core Tux -. be indeenden o& !e core Tux 171. A 1((0kA# 11((K44(0# "(06 single0!ase rans&ormer !as 1(( urns on !e secondar2 %inding. 8!e number o& urns in !e rimar2 %ill be A. ""( C. '7"( B. '7" -. ""(( 17'. 8!e em& induced in !e secondar2 %inding o& a "(06 single0!ase rans&ormer !a)ing 1(( urns on is secondar2 is ''' . 8!e maximum Tux densi2 in !e core is ' (.1 *bKm . 8!e cross0sectonal area o& !e core is ' ' A. (.1 m C. 1 m ' ' B. (.(1 m -. (.((1 m 17/. 8!e coer0loss and core0loss o& a rans&ormer o& a rans&ormer a )arious loads are as s!o%n belo%. A %!a load %ill !e e3cienc2 o& !e rans&ormer be a maximum+ A. \oad > "( kA# Core loss > /'( *# Coer \oss > "(( * B. \oad > 4( kA# Core loss > /'( *# Coer \oss > /'( * C. \oad > /( kA# Core loss > /'( *# Coer \oss > 1( * -. \oad > '( kA# Core loss > /'( *# Coer \oss > ( * 174. A rans&ormer %!en sul2ing a load mainained 11 k across erminals. *!en !e load %as s%ic!ed o# !e erminal )olage became 11""( . *!a is !e
)olage regulaton o& !e load+ A. 11.""$ C. "$ B. "."$ -. ""$ 17". :o%er los in !e oen0circui and s!ior(0circui ess on a rans&ormer gi)es aroximael2 an accoun o& !e &ollo%ing losses< A. Core0 losses and coer losses resect)el2 B. Coer0losses and core0losses resect)el2 C. Edd20curren loss and !2seresis loss resect)el2 -. 62seresis loss and edd20curren loss resect)el2 17,. Maximum e3cienc2 o& a rans&ormer occurs %!en A. !2seresis loss and edd2 curren loss are minimum B. !e sum o& !2seresis loss and edd2 curren loss is eual o coer loss in !e %indings C. o%er &acor o& !e load is leading -. !2seresis loss is eual o edd20curren loss 177. 8!e all0da2 e3cienc2 o& a rans&ormer is !e rato o& A. B. C. -. k*! ouu and k*! inu er da2 k*! ouu and k*! inu in a da2 ouu o%er and inu o%er inu o%er and ouu o%er 17. 8!e rato o& !e rimar2 o secondar2 )olage o& a rans&ormer is '
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