Module 04 Part 1

www.easaquestionpapers.blogspot.com Module 04.(B1) Electronic Fundamentals 1.1a. Semiconductors - Diodes.

Question Number. 1. What gives the colour of an LED?. Option A. The ac active el element. Option . . The pl plastic it it is is en encas case! in. Option ". ". The t# t#pe of of ga gas us use! in insi! si!e it it. "orr "orrec ectt Ans$e ns$err is. is. The The act activ ivee elem elemen ent. t. E%plana E%planatio tion. n. The active active element element is the element element use! in the !oping !oping of the semicon semicon!uc !uctor  tor  material. Aircraft Electricit# an! Electronics &th E!ition Eismin 'age 1(1.

Question Number. (. A germanium !io!e is use! for. Option A. A. rectification. Option . . voltage st stabili)ation. Option ". mo!ulation. "orr "orrec ectt Ans Ans$e $err is. is. rect rectif ific icat atio ion n. E%pl E%plan anat atio ion. n. *erm *erman aniu ium m !io! !io!ee has has the the least least for$ar for$ar! ! bias bias volt voltage age !rop !rop an! an! is best best for  for  rectification.

Question Number. +. Wh# is a !io!e pu put in in pa parallel $i $ith an LE LED?. Option A. To protect it fr from A". Opti Option on . ,o it $ill $ill $or$or- onl# onl# abov abovee a cert certai ain n vol volta tage ge.. Opti Option on ". ,o it $ill $ill $or$or- onl# onl# belo belo$ $ a cert certai ain n vol volta tage ge.. "orr "orrec ectt Ans Ans$e $err is. is. To prot protec ectt it it from from A". E%plana E%planatio tion. n. An LED has has a high for$ar for$ar! ! bias voltag voltagee !rop but but is easil# !amag !amage! e! $hen $hen reverse biase!. A" is therefore not goo! for an LED.

Ques Questi tion on Num Number. er. . When hen test testin ing g the the for$ for$ar ar! ! bias ias of a !io !io! !e $ith $ith a multi ultim meter eter.. Opti Option on A. the the pos posit itiv ivee lea! lea! of the the ohm ohmme meter ter is place place! ! on on the the ano! ano!e. e. Opti Option on . . it !oe !oess not not matte matterr $hich $hich termi termina nall the the posi positiv tivee lea! lea! of the the ohm ohmet eter er is plac place! e!.. Opti Option on ". the the pos posit itiv ivee lea! lea! of the the ohm ohmme meter ter is place place! ! on on the the catho catho!e !e.. "orrect "orrect Ans$e Ans$err is. the positi positive ve lea! lea! of of the the ohmm ohmmeter eter is plac place! e! on on the the ano!e ano!e.. E%planation E%planation.. To test for$ar! for$ar! bias/ bias/ the positiv positivee lea! of the the multimeter multimeter must must be place! place! on on the ano!e. Note0 f the 2uestion sa#s 3 moving coil meter3 then it $oul! be the negative lea! on the ano!e/ since the negative si!e of the batter# in such a meter is connecte! to the 4 lea!. Aircraft Electricit# an! Electronics &th E!ition Eismin 'age 11+.

Question Number.

Option A.

&.

This is a !iagram of.

an ,"5.

Share your documents with us at ([email protected] ( [email protected])) DownloadOur Mobile pp !or "ecent #apers

www.easaquestionpapers.blogspot.com Option . a T5A". Option ". a ,chott-# !io!e. "orrect rect Ans$er is. an ,"5. E%pla %plana nati tion on.. NL NL.

Question Number. 6. Which of the follo$ing !escribes the characteristics of a Th#ristor?. Option A. A. 7igh vo voltage ha han!ling. Option . 7igh po$er han!ling. Option ". ". 7igh cu current ha han!ling. "orr "orrec ectt Ans Ans$e $err is. is. 7igh 7igh curr curren entt han han!l !lin ing. g. E%planation E%planation.. A th#ristor th#ristor 8such 8such as an ,"59 ,"59 is a high high current current s$itchin s$itching. g.

Question Number. :. Light Emitting Dio!es 8LEDs9. Opti Option on A. emit emit lig light ht of of onl# onl# one one $av $avel elen engt gth h !epe !epen! n!en entt on t#pe t#pe.. Option . . have ve ver# $i!e vi vie$i e$ing an angles. Opti Option on ". ". are are easi easil# l# !am !amag age! e! if if for$ for$ar ar! ! bia biase se! ! b mor moree than than &; &;. "orrect "orrect Ans$e Ans$err is. emit emit light light of onl# onl# one $avele $avelengt ngth h !epe !epen!e n!ent nt on on t#pe. t#pe. E%pla %plana nati tion on.. NL NL.

Quest estion Number. er. . When a hole !i !iffuses fr from a pBreg region to to th the nB nBregi egion it it. Opti Option on A. beco become mess a mino minori rit# t# carr carrie ierr in in the the nBre nBregi gion on.. Option . . lo$ers the po potential bar barrrier. Option ". ". raises ses th the po potenti entiaal ba barrie rier. "orre "orrect ct Ans$e ns$err is. is. raise raisess the the pote potenti ntial al barr barrier ier.. E%plana E%planatio tion. n. This This is !escrip !escriptiv tivee of holes holes crossing crossing the 'N =unctio =unction n to form form the !epletio !epletion n la#er. Aircraft Aircraft Electricit# Electr icit# an! Electronics Elect ronics &th E!ition Eismin 'age 111.

Ques Questi tion on Num Number. er. 1@. The =u =uncti nctio on barr barrie ierr off offer erss op oppositi sition on to onl# onl#.. Option A. holes in in the pBregion. Opti Option on . free free elec electr tro ons in the the nBre nBreg gion. ion. Opti Option on ". ma=or a=orit it# # car carri rier erss in in bo both regi regio ons. ns. "orre "orrect ct Ans$e ns$err is. is. ma=o ma=orit rit# # car carrie riers rs in in bot both h regi region ons. s. E%pl E%plan anat atio ion. n. NL. NL. http http0F 0FFen Fen.$ .$ii-ip ipe!i e!ia. a.or orgF gF$i $i-i -iF' F'Bn BnK= K=un uncti ction on Share your documents with us at ([email protected] ( [email protected])) DownloadOur Mobile pp !or "ecent #apers

www.easaquestionpapers.blogspot.com

Quest estion Number. er. 11. Avalanc anche brea-!o$n occu ccurs $hen. en. Opti Option on A. reve revers rsee bia biass e% e%cee! cee!ss a cer certa tain in value alue.. Opti Option on . for$ for$ar ar! ! bia biass e% e%cee! cee!ss a cert certai ain n val value ue.. Opti Option on ". for$ for$ar ar! ! cu curren rrentt bec becom omes es e%ce e%cess ssiv ive. e. "orre "orrect ct Ans$e ns$err is. is. reve reverse rse bias bias e%c e%cee! ee!ss a cert certain ain value value.. E%plana E%planatio tion. n. 5everse 5everse biasin biasing g a !io!e !io!e $ill cause cause avalanche avalanche brea-!o brea-!o$n $n at a certain certain value. value. Aircraft Electricit# an! Electronics &th E!ition Eismin 'age 1(@.

Ques Questi tion on Num Number. er. 1(. f for for$a $ar! r! bia biass is inc incre reas ase! e! fro from m )ero )ero on a pBn pBn =un =unct ctio ion/ n/ a rap rapi! increase in current flo$ for a relativel# small increase in voltage occurs. Opti Option on A. $hen $hen the the flo$ flo$ of mino inorit# rit# carri carrier erss is suff suffic icie ient nt to cause cause an avala avalanc nch he  brea-!o$n. Opti Option on . . $hen $hen the the !ep !eple letio tion n la# la#er er beco become mess larg larger er tha than n the the spa space ce cha charg rgee area area.. Opti Option on ". onl# onl# afte afterr the the for$ for$ar! ar! bias bias e%cee e%cee!s !s the the pot poten enti tial al barr barrier ier.. "orrect "orrect Ans$e Ans$err is. onl# onl# after after the for$ar! for$ar! bias bias e%cee! e%cee!ss the the poten potential tial barrier barrier.. E%planation E%planation.. A for$ar! for$ar! biase! 'N 'N =unction =unction $ill con!uct con!uct onl# onl# $hen $hen the for$ar! for$ar! bias bias voltage voltage e%cee!s the =unction barrier barr ier B i.e ,i  @.6;/ *e  @.(;.

Quest estion Nu Number. er. 1+. A ban! an! pa pass fi filte lter e% e%clu!es fre2u e2uencie cies. Opti Option on A. belo$ elo$ the the fre fre2u 2uen enc# c# re2 re2uire uire! ! onl onl# #. Opti Option on . abov abovee an! an! belo belo$ $ the the fre fre2u 2uen enc# c# re2u re2uir ire! e!.. Opti Option on ". abov abovee th the fre fre2u 2uen enc# c# re2u re2uir ire! e! onl# nl#. "orre "orrect ct Ans Ans$e $err is. abov abovee an! belo belo$ $ the the fre2u fre2uen enc# c# re2 re2ui uire re!. !. E%pl E%plan anat atio ion. n. A ban! ban!Bp Bpas asss filt filter er e%cl e%clu! u!es es fre2 fre2ue uenc ncie iess abov abovee an! an! belo belo$ $ a part partic icul ular  ar  fre2uenc#. Aircraft Electricit# an! Electronics Electr onics &th E!ition Eismin 'age (