www.easaquestionpapers.blogspot.com 04a. Corrosion.
Questio tion Number. 1. From the follo llowing list of metal tals, which is most ost catho thodic?. Option A. Nickel. Option B. agnesium. Option !. "tainless steel. !orrect Answer is. "tainless steel. #$planation. N%&.
Question Number. '. %ntergrannular corrosion is caused b(. Option A. A. imp improperl( assem sembled co components. ts. Option B. improper heat treatment. Option !. dissimilar metal contact. !orre orrecct Answe nswerr is. is. imp imprope roperr hea heat tre treat atm ment. ent. #$planation. N%&.
Questio tion Number. ). !orrosion caused b( electrol(t l(tic action ion is the result of. Option A. contac tact bet betw ween tw two un unlike ike me metal tals. Option B. B. e$cessi*e an anodi+ation. Option !. the wrong uenching agent. !orr !orrec ectt Answe nswerr is. is. cont contac actt bet betwe ween en two two unl unlik ikee met metal als. s. #$planation. N%&.
Questio tion Number. -. !orrosion ma( be regarded as the destru tructio tion of meta etal b(. b(. Option A. electrochemical action. Option B. h(droelectric action. Option !. electromechanical ac action. !orre orrecct Answe nswerr is. is. ele electro ctroch chem emic ical al acti actio on. #$plan #$planatio ation. n. !orros !orrosion ion is elec electro troche chemic mical al action action.. B&B&-/1 /1 '. '.
Question Number. 0. #$foliation co corrosion is is so sometimes re referred to to as as. Option A. la(er co corrosion. Option B. B. filiform co corrosion. Option !. !. sub/surface co corrosion. !orrect Answer is. la(e a(er corrosion. #$planation. N%&.
Questio tion Nu Number. . 2hen di dissim ssimil ilaar me metal tals ar are br brought to togethe ther, or or th the sam samee me metal in in different states, one metal forms the anode and the other the cathode. 2hich will suffer from corrosion?. Option A. Both wi will co corrode e euall(. l(. Option B. 3he cathode. Option !. 3he anode. !orrect Answer is. 3he anode. #$pla #$plana natio tion. n. 3he 3he anod anodee alwa( alwa(ss corr corrod odes es..
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www.easaquestionpapers.blogspot.com Question Nu Number. 4. %n co corrosion, th the el electrode th that lo loses el electrons is is. Option A. the cathode. Opti Option on B. eith either er the the cat catho hode de or the the ano anode de depe depend ndin ing g upo upon n the the ele electr ctrol( ol(te. te. Option !. the anode. !orr !orrec ectt Ans Answe werr is. is. eithe eitherr the the cath cathod odee or the the ano anode de dep depen endi ding ng upo upon n the the elec electro trol( l(te te.. #$pla #$plana natio tion. n. 3he 3he anod anodee loses loses elec electr tron ons. s.
Question Number. 5. 2hich of these is a common cause of corrosion?. Option A. 2ater in fuel. Option B. "pilled batter( acid. Option !. 6ntreated metal. !orrect An Answer is is. "pilled ba batter( acid. #$plan #$planatio ation. n. "pille "pilled d batt batter( er( acid acid is sure sure to cause cause corr corrosio osion. n.
Question Number. 7. 2hat is stress corrosion?. Opti Option on A. !orro orrosi sio on in in an an are areaa und undeer c( c(clic clic load loadin ing g. Option B. !orrosion due to fretting. Opti Option on !. !orr !orros osio ion n in an area area unde underr cont contin inuo uous us load loadin ing. g. !orr !orrec ectt Answe nswerr is. is. !orr !orros osio ion n in in an an area area unde underr con conti tinu nuou ouss loa loadi ding ng.. #$planation #$planation.. "tress corrosion corrosion is caused caused b( a stressed stressed area area being being anodic anodic to a non/str non/stressed essed area. area. 8o not confuse with corrosion/fatigue. B&-/1 ).1..
Questio tion Nu Number. 19. #lec lectro trochemi emical re reactio tion is is ca caused sed b( b( the co contact of of. Option A. bonding. Option B. B. moist oistu ure on on th the su surface of of th the me metal. Option !. dissimilar metals. !orr !orrec ectt Ans Answe werr is. is. moist oistur uree on on the the surf surfac acee of of the the meta metal. l. #$planation #$planation.. 8issimilar 8issimilar metals causes causes gal*anic gal*anic corrosion, corrosion, but pure metal in contac contactt with with water water causes electro/chemical corrosion.
Question Number. 11. !hemical attack is a direct result of. Option A. intergranular corrosion. Opti Option on B. cath cathod odic ic : ano anodi dicc cha chan nges ges in in the the mater ateria ial. l. Option !. !. filiform co corrosion. !orr !orrec ectt Ans Answe werr is. is. cath cathod odic ic : ano anodi dicc chan change gess in the the mat mater eria ial. l. #$plan #$planatio ation. n. A:; echan echanics ics oin >oinin ing g of of ' diss dissim imil ilar ar metal etals. s. #$planation. N%&.
Ques Questi tion on Num Number. er. metal.
1).
%n the the gal* gal*an anic ic serie eries, s, the the mos mostt nob noble le metal etal will will,, if if >o >oined ined to ano another ther
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www.easaquestionpapers.blogspot.com Option A. alwa(s a(s be be at at th the top of the table. Option B. B. corrode be before th the le less no noble meta etal. Opti Option on !. allo allow w the the less less nob noble metal etal to corr corrod odee fir first st.. !orr !orrec ectt Ans Answe werr is. is. allo allow w the the les lesss nobl noblee met metal al to to corr corrod odee fir first st.. #$pla #$plana natio tion. n. N%&. N%&. http http ww www w.mcn .mcnal all( l(ins insti titu tute te.c .com om! !ha hart rtsg sgal* al*an anic ic/se /seri ries. es.ht html ml
Question Nu Number. 1-. "tress co corrosion is is as associated wi with. Option A. c(c c(clic loading an and a corrosion pi pit. Opti Option on B. a cor corro rosi sion on pit pit in in a mem member ber und under er a com compr pres essi si*e *e load load.. Opti Option on !. a cor corro rossion ion pit in a mem membe berr und under er stre tress. ss. !orr !orrec ectt Ans Answe werr is. is. a cor corro rosi sion on pit pit in in a mem membe berr und under er stre stress ss.. #$planation. N%&.
Ques Questi tion on Num Number. er. 10. !orro orrosi sion on will will sprea pread d more ore rap rapidl( idl( when when metal etalss are are e$po e$pose sed d to. to. Option A. cold climates. Option B. high temperatures. Option !. dr( climates. !orrect An Answer is is. high igh tem temp peratur tures. es. #$planation. N%&.
Question Number. 1. 2hich is th the fo following correct st statement?. Opti Option on A. "ele "eleni niou ouss acid acid is used used for for the the re/p re/pro rote tecti ction on of alumi alumini nium um allo( allo(s. s. Opti Option on B. B. 3he 3he chem chemic ical al tes testt for for bron bron+e +e is is nitr nitric ic aci acid d which which prod produc uces es a whi white te pre preci cipi pita tate te.. Option !. !. All co corrosio sion is is a chemic emicaal ac action ion. !orrec !orrectt Answ Answer er is. is. 3he chemic chemical al test test for bron+e bron+e is nitr nitric ic acid acid which which prod produce ucess a white white prec precipi ipitat tate. e. O@ All corrosion is a chemical action. #$planation. N%&.
Ques Questi tion on Num Number. er. 14. %n a poorl oorl( ( produ roduce ced d rep repaair to skin skin stru struct ctur uree, whe wherre wou would ld str stress ess corrosion start?. Opti Option on A. @adia adiate te from rom the the corn corner er or sh sharp arp ed edges. ges. Option B. Along the edges of repair. Opti Option on !. Form Form inte intern rnaall( ll( to to pro produ duce ce sur surfface ace corr corros osio ion. n. !orr !orrec ectt Ans Answe werr is. is. @adi @adiat atee fro from m the the corn corner er or shar sharp p edg edges es.. #$planation. N%&.
Ques Questi tion on Num Number. er. 15. "om "ome metal etalss are inh inheren erentl tl( ( stab stable le.. 2hat hat does does this this sugg sugges est? t?.. Option A. 3he( strongl( resist corrosio sion. Option B. B. 3he( are hi highl( prone to to co corrosion. Opti Option on !. 3he( 3he( tr( tr( to re* re*ert ert to to the their natu natura rall sta state te.. !orr !orrec ectt Answe nswerr is. is. 3he( 3he( stro strong ngl( l( resi resist st corr corros osio ion. n. #$planation. N%&.
Questio tion Number. 17. 3he o$ o$ide fil film m formed on on the sur surface of of alu alum minium is. Option A. non/porous. Option B. porous. Option !. hard and porous. Share your documents with us at (
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www.easaquestionpapers.blogspot.com !orrect Answer is. non/porous. #$pla #$plana natio tion. n. 3hat 3hat is is wh( alum alumini inium um doe doess not not corr corrod ode. e.
Question Number. '9. !orrosion control begins at the. Option A. production stage. Option B. manufacturing stage. Option !. design stage. !orrect Answer is. design stage. #$planation. N%&.
Question Number. '1. Aluminium is. Option A. not re resistant to to co corrosion. Option B. high ighl( resis sistant to corrosion ion. Option !. !. reason sonabl( resist istant to to co corrosion. !orre orrecct Ans Answe werr is. is. high ighl( re resist sistan antt to corr corro osio sion. #$planation. N%&.
Ques Questi tion on Num Number. er. ''. 2hen hen gal* gal*an anic ic corr corros osio ion n tak takes plac place, e, whic which h part part cor corrod rodes? es?. Option A. Anode. Option B. O$ide film coating. Option !. !athode. !orrect Answer is. Anode. #$planation. N%&.
Questio tion Number. '). !orrosion ca caused b( b( gal*anic ac action is is th the re result of of. Option A. contac tact bet betw ween tw two un unlike ike me metal tals. Option B. B. e$cessi*e an anodi+ation. Option !. e$cessi*e etching. !orr !orrec ectt Answe nswerr is. is. cont contac actt bet betwe ween en two two unl unlik ikee met metal als. s. #$planation. N%&.
04b. Corrosion.
Questio tion Nu Number. 1. 2hat so sort of of co corrosion ion wo would a ma magneto be be lik likeel( to en encounter ter if if completel( enclosed?. Opti Option on A. None None,, pro pro*i *idi ding ng the the mag magne neto to is com complet pletel el( ( enc enclo lose sed. d. Option B. B. 8irect ch chemical at attack. Option !. ;itting. !orre orrecct Answe nswerr is. is. 8irec irectt chem chemic ical al atta attack ck.. #$pl #$plan anat atio ion n. B&-/ &-/1 1 ).1.5 .1.5..
Question Number. '. 2hat are the signs of fretting corrosion?. Option A. Blac lack powder or cocoa st staining ing. Option B. %ntergranular cracking. Option !. Flaking. !orr !orrec ectt Answe nswerr is. is. Blac Black k powd powder er or coco cocoaa stai staini ning ng.. Share your documents with us at (
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www.easaquestionpapers.blogspot.com #$pl #$plan anat atio ion. n.
!A%; !A%; B&B&-/1 /1 par paraa ).1. ).1.0. 0.
Question Nu Number. ). Black st streaks ba back fr from a ri*et ho hole si signif(. Option A. A. gal*anic co corrosion. Option B. B. intergrannular co corrosion. Option !. fretting. !orrect Answer is. fretting. #$plan #$planatio ation. n. Frettin Fretting g corrosi corrosion on is identi identifie fied d b( black black gre( strea streaks. ks. B&-/ B&-/1 1 ).1.0. ).1.0.
Question Nu Number. -. 2hen a steel pa part is is we welded, co corrosion oc occurs be because. Option A. it is affected b( spatter. Option B. the strip has become anodic. Option !. paint has been remo*ed. !orre orrecct Ans Answe werr is. is. the the st strip rip has has becom ecomee an anodic odic.. #$pl #$plan anat atio ion n. B&-/ &-/1 1 ).1..1.-..
Question Number. 0. %ntergranular corrosion. Opti Option on A. can can be be rec recog ogni ni++ed b( a gr gre( powde owderr dep depos osiit. Opti Option on B. ma( ha*e ha*e no *isu isual surf surfac acee indi indica cati tio on. Opti Option on !. can can be be rec recog ogni+ ni+ed ed b( its flak flakin ing g and and lift liftin ing g of of the the mate materi rial al la(er la(ers. s. !orr !orrec ectt Ans Answe werr is. is. ma( ha*e ha*e no *isu *isual al surf surfac acee ind indic icat atio ion. n. #$pl #$plan anat atio ion n. B&-/ &-/1 1 '.).' .).'..
Question Number. . Acti*e flu$ does what?. Option A. ;rotects. Option B. !leans. Option !. Both cleans and protects. !orrect Answer is is. !leans. #$planation. N%&.
Question Number. 4. ointing compound is us used for what re reason?. Opti Option on A. 3o pre* pre*en entt dis dissi sim milar ilar metal etal cor corrosi rosion on.. Option B. B. 3o bond th the co compon ponents to togethe ther. Opti Option on !. 3o mak makee th the com compo pon nents ents ea easier sier to disa disass ssem emb ble. le. !orr !orrec ectt Ans Answe werr is. is. 3o pre pre*e *ent nt diss dissim imil ilar ar meta metall corr corros osio ion. n. #$plan #$planatio ation. n. ointi ointing ng compo compound und is is used used to pre*e pre*ent nt dissim dissimilar ilar metal metal cont contact act..
Questio tion Nu Number. 5. e sub>ect ct to *er( *er( slig slight ht mo*em mo*emen entt bet betwe ween en the the two two.. Opti Option on B. a dee deep p scr scrat atch ch incr increa ease sess to to bec becom omee fre frett ttin ing g cor corro rosi sion on.. Opti Option on !. pitt pittin ing g cor corro rosi sion on is allo allowe wed d to to bec becom omee mor moree pro prono noun unce ced. d. !orr !orrec ectt Ans Answe werr is. is. two two mate materi rial al are are sub sub>e >ect ct to to *er( *er( slig slight ht mo* mo*em emen entt betw betwee een n the the two. two. #$plan #$planatio ation. n. Frettin Fretting g is corro corrosion sion combin combined ed with with small small rela relati* ti*ee mo*em mo*ement. ent. Share your documents with us at (
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Questio tion Number. '4. 2hat is used to remo emo*e corrosion from magn agnesium ium?. Option A. ;hosphate acid solution. Option B. !hromic acid solution. Option !. "ulphuric acid solution. !orre orrecct Answe nswerr is. is. !hrom hromic ic acid acid solu soluti tio on. #$planation #$planation.. !hromic !hromic acid acid solutio solution n is used to remo*e remo*e corrosion corrosion from magnesium magnesium allo(s. allo(s. A!-) A!-) / )1.
Questio tion Nu Number. '5. "urface co corrosion ion on on st stainle inlesss ste steeel is is id identif tified ied b( b(. Option A. red rust. Option B. white film. Option !. black pitting. !orrect An Answer is is. black pi pitting. #$plan #$planatio ation. n. "urfac "urfacee corros corrosion ion on on stainle stainless ss steel steel is a black black pitti pitting. ng. A!-) A!-) /0. /0.
Ques Questi tion on Num Number. er. '7. =ook ooks, wire wiress and and other ther susp suspen ensi sion on de*ic e*ices es used used in an anod anodic ic bath bath should be made of. Option A. brass or copper. Option B. aluminium or titanium. Option !. steel or copper. !orre orrecct Answe nswerr is. is. alum alumin iniu ium m or tita titani nium um.. #$pla #$plana natio tion. n. !A%; !A%;ss B& B&4/ 4/1 1 ;ar ;ara. a.-. -. B&4 B&4/1 /1 -.1 -.1..
Questio tion Number. )9. 2hat are the signs of frettin ting corrosion on steel?. Option A. 8ark staining around area. Opti Option on B. "urf "urfac acee cra crack ckin ing g as as cor corro rosio sion n bre break akss thr throu ough gh to surf surfac acee of of com compo pone nent nt.. Option !. @ust on surface. !orrec !orrectt Answ Answer er is. is. "urfac "urfacee crac crackin king g as as corro corrosio sion n brea breaks ks thro through ugh to surf surface ace of compon component ent.. O@ O@ 8ark staining around area. #$planation #$planation.. Fretting Fretting corrosio corrosion n is caused when there is some some relati*e relati*e mo*ement mo*ement between between parts, parts, causing a fine dark powder( powder ( paste of corrosion products. B&-/1 ;ara.).1.0.
Question Nu Number. )1. "pilled me mercur( on on al aluminium. Opti Option on A. incr increa ease sess sus susce cept ptib ibil ilit( it( to h(dr h(drog ogen en embr embrit ittl tlem emen entt Opti Option on B. ma( caus causee impa impair ired ed corr corros osion ion resi resista stanc ncee if if lef leftt in in pro prolo long nged ed cont contac act. t. Opti Option on !. caus causes es rapi rapid d and and se*e se*ere re corr corros osio ion n in in pro prolo long nged ed cont contac act. t. !orrec !orrectt Answ Answer er is. ma( cause cause impair impaired ed corros corrosion ion resista resistance nce if left left in in prol prolong onged ed contac contact. t. O@ causes rapid and se*ere corrosion in prolonged contact. #$pl #$plan anat atio ion n. B&-/ &-/19 19 ;a ;ara.' ra.'..
Question Nu Number. )'. %ntercr(stalline co corrosion. Option A. is de detectable b( b( $/ra(s. Option B. B. is th the sam samee as as e$ e$foliation ion co corrosio sion. Opti Option on !. alwa alwa( (s app appea ears rs as smal smalll su surfac rfacee crac crack ks. !orre orrecct Answe nswerr is. is. is det detecta ectab ble b( $/r $/ra(s. a(s. #$planation. N%&. Share your documents with us at (
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Ques Questi tion on Num Number. er. )). 3he 3he usu usual al manuf anufac actu turrers ers ant anti/ i/co corrrosi rosio on pro proccess ess to to be be app appli lied ed to Fe aircraft parts is. Option A. cadmium pl plating. Option B. anodising. Option !. metal spra(ing. !orrect Answer is. cadmium ium plating ing. #$planation. N%&.
Question Number. )-. !hromate treatment is applied to. Option A. Al allo(s. Option B. Fe allo(s. Option !. magnesium allo(s. !orrect Answer is. magn agnesium ium allo( llo(ss. #$planation. N%&.
Questio tion Number. )0. Anti/c i/corrosion ion treatme tment used sed on agnesium ium is. Option A. chromating. Option B. electro/plating. Option !. phosphating. !orrect Answer is. chromating. #$pl #$plan anat atio ion n. B&-/ &-/) ) ).1.) .1.)..
Question Number. ). Fretting corrosion occurs with. Option A. A. water tr trapped be betwe tween mo mo*ing pa parts. Option B. *ibration in bolted parts. Option !. improper heat treatment. !orre orrecct Ans Answe werr is. is. *ibra ibrati tio on in in bo bolted lted parts arts.. #$pl #$plan anat atio ion n. B&-/ &-/1 1 ).1.0 .1.0..
Questio tion Number. )4. %ntergranular cor corrosio sion is also known as what?. Option A. "tress corrosion. Option B. #$foliation. Option !.
