Module 03 Part 4

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11. Inductance/inductor. 11. Inductance/inductor.

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Quesestition on NuNummbberer.. 11.. TwTwo o ininduductctivive ce cooilils s arare pe plalaceced d in in clcloose se pproroxiximmitity y wwitith eh eacachh other at 90 degrees. The number of flux linkages is.

other at 90 degrees. The number of flux linkages is. 

ppttiioon n !!.. 00.. 

ppttiioon n "".. mmaaxxiimmuum m nneeggaattiivvee.. 

ppttiioon n ##.. mmaaxxiimmuum m ppoossiittiivvee.. #

#oorrrreecct t !!nnsswweer ir iss.. 00.. $xpla

$xplanationnation The The coils coils must must be pbe parallel arallel for mfor maximum aximum flux flux linkalinkages ges %coupl%coupling ing factor&factor&.. #oupling factor reduces as angular difference increases to.

#oupling factor reduces as angular difference increases to. Q

Quuesesttiioon Nn Nuummbberer.. ''.. ((hhat at iis ts thhe me mututuuaal il inndduucctatanncce ie if tf twwo co cooiills os of 1f 100mm) a) anndd *00m) have 90+ of the flux transferred from one to the other,.

*00m) have 90+ of the flux transferred from one to the other,.  ppttiioon n !!.. --**99mm))..  ppttiioon n "".. --..**mm))..  ppttiioon n ##.. //mm)).. #

#oorrrreecct !t !nnsswweer ir iss.. //mm)).. $xp

$xplanalanatiotionn TTototal inal inducductantance  0ce  0.9  .9  rooroot  10 t  10  *0 *00  0  /./. Qu

Quesestition on NuNummbberer.. //.. !!n in innduductctor or hahas 1s 1202000 00 tuturnrns os of wf wirire ae and nd a ca crorosss ss secectitioonanal al arereaa of 0.001m'. 3f the core has a permeability of 0.0002001 and the coil is 0.1m. (hat is the of 0.001m'. 3f the core has a permeability of 0.0002001 and the coil is 0.1m. (hat is the value of the inductor,.

value of the inductor,.  ppttiioon !n !.. 110000mmiiccrroo))..  ppttiioon n "".. 110000mm))..  ppttiioon n ##.. 1100mm)).. #

#oorrrreecct !t !nnsswweer ir iss.. 1100mm)).. $xp

$xplanalanatiotionn 0.00.000000001011001000000.00.00140140.1  .1  0.00.01  11  10 m0 m).). Q

Quuesesttiioon Nn Nuummbberer.. --.. TThhreree ie inndduuccttoorrs 1s 10 m0 m))2 * 2 * mm) a) annd 'd '0 m0 m) a) are re ccoonnnnecectted ed iinn parallel. (hat is the total inductance,.

parallel. (hat is the total inductance,. pt

ption ion !.!. (i(ithothout ut knoknowinwing tg the he coucouplipling ng factfactor or the the tottotal ial indunductactance nce cancannot not be be foufound.nd. 

ppttiioon n "".. ''..55mm)).. 

ppttiioon n ##.. //**mm)).. #

#oorrrerect ct !!nnsswweer ir iss.. ''..55mm)).. $xpla

$xplanationnation 3n p3n parallel2 arallel2 the tothe total intal inductanductance is ce is lower lower than than the lthe lowest owest singlsingle inde inductancuctance.e. Qu

Quesestition on NuNummbberer.. **.. 3f 3f ththe ce cururrerent nt rereacachehes s a ma maxaximimum um ththrorouugh gh an an inindduuctctoor or of 'f '! ! inin 1* seconds2 what is the current after / seconds,.

1* seconds2 what is the current after / seconds,.  ppttiioon n !!.. 11..''!!..  ppttiioon n "".. 00..//!!..  ppttiioon n ##.. 11!!.. #

#oorrrerect ct !!nnsswweer r iiss.. 11..''!!.. $xpla

$xplanationnation 1 tim1 time cone constant stant  1*4 1*4*  /*  /s. 1s. 100+ c00+ chargharge  '!e  '!2 so 2 so 1 tim1 time conse constant %tant %/.'+/.'+& &  1.'!.

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Quueessttiioon Nn Nuummbbeerr.. .. TThhe te tiimme ce coonnssttaannt ot of af an in inndduuccttoor ir iss..  ppttiioon n !!.. 664477..  ppttiioon n "".. 66''_47._47.  ppttiioon n ##.. 6677.. #

#oorrrreecct t !!nnsswweer ir iss.. 664477.. $

$xxppllaannaattiioonn NN3366.. Qu

Quesestition on NuNummbberer.. 88.. 3f 3f ththe re ratate oe of cf chhanangge oe of cf cuurrrrenent it is s hahalvlveded2 2 mumututual al inindducuctatanncece will.

will. 

ppttiioon n !!.. ssttaay y tthhe e ssaammee.. 

ppttiioon n "".. hhaallvvee.. 

ppttiioon n ##.. ddoouubbllee.. #o

#orrrrecect t !!nsnswewer ir is.s. sstatay y ththe se samame.e. $xpla

$xplanationnation et tet the fohe formula rmula for mfor mutual utual inducinductance. tance. 7ate 7ate of chof change ange of cuof current rrent %i.e.%i.e. fre:uency& is not in it.

fre:uency& is not in it. Qu

Quesestition on NuNummbberer.. 55.. (hy (hy arare te thhe ie iroron n cocoreres s of of mmosost t inindducuctitioon n cocoilils s lalammininatateded,.,. p

ptition on !!.. TTo o rereduduce ce ththe ee effffecects ts of of ededdy dy cucurrrrenentsts.. p

ptition on "".. TTo o reredducuce e ththe e cocore re rereluluctctanancece.. p

ptition on ##.. TTo o inincrcreaease se ththe ce corore pe perermmeaeabibililityty.. #o

#orrerrect !ct !nsnswewer is.r is. TTo ro rededucuce the the efe effefects octs of edf eddy cdy cururrenrentsts.. $

Quesestition on NuNummbberer.. 99.. ((hehen n mmorore e ththan an twtwo o inindducuctotors rs of of ddififffererenent t ininduductctanance ce araree connected in parallel in a circuit2 the total inductance is.

connected in parallel in a circuit2 the total inductance is. p

ptition on !!.. e:e:uaual tl to to the he susum om of tf the he inindidivividudual ial indnducuctatancnce.e. p

ptition on ".". e:e:ual ual to to ththe ie indnducuctantance ce of of ththe he higighehest st ratrated ed ininduductctoror.. p

ptition on #.#. leless ss ththan an ththe ie indnducuctatance nce of of ththe le lowowesest rt rateated id indnducuctotor.r. #or

#orrect rect !n!nswswer iser is.. less thless than tan the ihe indunductanctance oce of thf the lowe lowest est ratrated ied indunductoctor.r. $xpla

$xplanationnation !ddin!dding indg inductors uctors in pin parallel arallel is this the same same forme formula as ula as resisresistors itors in pan parallel %irallel %i.e..e. adding an inductor actually decreases the inductance&.

adding an inductor actually decreases the inductance&. Qu

Quesestition on NuNumbmberer.. 1010.. ThThe te timime ce cononststanant it in an an in indnducuctitive ve cicircrcuiuit it is ts the he titime me rere:u:uirired ed fofor r the current to reach.

the current to reach. 

ppttiioon n !!.. 8800..88+ o+ of mf maaxxiimmuum vm vaalluuee.. 

ppttiioon "n ".. //..''+ o+ of mf maaxxiimmuum vm vaalluuee.. 

ppttiioon #n #.. //..88+ o+ of mf maaxxiimmuum vm vaalluuee.. #o

#orrrrecect !t !nsnswewer isr is.. /.'/.'+ o+ of mf maxaximimum um vavalulue.e. $

Quesestition on NuNummbberer.. 1111.. !!n !n !# i# innduductctivive ce cirircucuit it hhas as an an ininduductctanance ce 00f 1f 10 m0 m) a) and nd aa fre:uency input of 1000);. The opposition to current flow

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 ppttiioon n !!.. / / oohhmmss..  ppttiioon n "".. //2200000 0 oohhmmss..  ppttiioon n ##.. //0 0 oohhmmss.. #

#oorrrerect ct !!nnsswweer ir iss.. / / oohhmmss.. $xpla

$xplanationnation 3ndu3nductive rctive reactance eactance is 'pis 'pi  f i  f  6  6  .' .'5  15  1000 000  10 1041000 41000  '. '.5 ohm5 ohms.s. Q

Quueessttiioon Nn Nuummbbeerr.. 11''.. 77oottaattiinng cg cooiil " l " tthhrroouuggh 9h 900< w< wiillll..

p

ptition on !!.. inincrcreaeasse e ththe e $=$=> > inindducuced ed ininto to "".. p

ptition on "".. inincrcreaeasse e ththe e $=$=> > inindducuced ed ininto to !!.. p

ptition on ##.. ddececrereasase e ththe $e $=> => inindducuced ed ininto to "".. #o

#orrerrect ct !!nsnswewer isr is.. decredecreasase te the $he $=> => ininduduceced id intnto "o ".. $xpla

$xplanationnation #oup#oupling ling factor factor is mis maximum aximum when when the cothe coils ails are parare parallel. 3t llel. 3t is ;eris ;ero if to if they ahey are atre at 90< to each other.

90< to each other.

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Quesestition on NuNummbberer.. 11/./. !!n in innduductctor or of of reresisiststanance ce * k* k? a? and nd ininduductctanance ce ''mm) i) iss connected to a @# circuit. The time constant is.

connected to a @# circuit. The time constant is.  ppttiioon n !!.. --000 0 nnss..  ppttiioon n "".. 110 0 sseeccoonnddss..  ppttiioon n ##.. --0 0 mmss.. #

#oorrrerect ct !!nnsswweer r iiss.. --000 0 nnss.. $xpla

$xplanationnation TimTime cone constant stant  647  647  'm 'm)4*00)4*000  0  0.000.000200020002- 02- seconseconds ds  -0 -00 n0 ns.s. Qu

Quesestition on NuNumbmberer.. 1-..1- (h(hen en swswititchchining g ofoff f ththe se supupplplyy2 2 ththe be bacack $k $=> => in in a ca colollalapspsiningg field in an

field in an inductor.inductor. p

ptition on !!.. cacan bn be me mulultitiplple te timimes es bibigggger ter thahan fn fororwaward rd $=$=>>.. 

ppttiioon "n ".. nneevveer er exxcceeeedds s ffoorrwwaarrd $d $==>>.. 

ppttiioon #n #.. iis es e::uuaal tl to fo foorrwwaarrd $d $==>>.. #or

#orrect rect !n!nswswer ier is.s. can be can be mulmultiptiple tle timeimes bs biggigger ter than han forforwarward $d $=>=>.. $xpla

$xplanationnation The The si;e si;e of tof the bahe backAemf ckAemf dependepends uds upon pon how how fast fast the mthe magnetic agnetic field field isis collapsing. That is how your car ignition

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Quueessttiioon n NNuummbbeerr.. 11**.. !!n n iinndduucceed d ccuurrrreennt t iin n a a ccooiill.. 

ppttiioon !n !.. ooppppoossees ts thhe $e $=> => pprorodduucciinng ig itt.. p

ptition on "".. ddoeoes ns noot at afffefect ct ththe $e $=> => pproroduducicing ng itit.. 

ppttiioon n ##.. aaiidds s tthhe e $$==> > pprroodduucciinng g iitt.. #o

#orrerrect ct !!nsnswewer ir is.s. oppoopposeses ts the he $=$=> p> proroduducicing ng itit.. $xpla

$xplanationnation The iThe inducenduced currd current in ent in a coil a coil %indu%inductor& octor& oppospposes thes the curre current whent which pich produroduces itces it.. Qu

Quesestition on NuNumbmberer.. 11.. 1 1 BBoolt lt is is prprododucuced ed whwhen en a ca cururrerent nt of of 1 1 !!mp mp peper sr sececonond id iss varied in a

varied in a coilC. coilC. This is This is a definition of.a definition of. 

ppttiioon n !!.. 1 1 !!mmppeerre pe peer mr meettrree.. 

ppttiioon n "".. 1 1 ))eennrryy.. 

ppttiioon n ##.. 1 1 ##oouulloommb b ppeer r sseeccoonndd.. #

#oorrrerect ct !!nnsswweer ir iss.. 1 )eennry1 ) ry.. $xpla

$xplanationnation 6ens6ensC 6aw C 6aw "$=> "$=>  A6  A6 d34dt d34dt !irc!ircraft $lraft $lectrical ectrical DystemDystems Ealls EalletCs /etCs /rd $drd $ditionition !ppendix 1 page 19*.

!ppendix 1 page 19*. Qu

Quesestition on NuNumbmberer.. 1818.. TTwwo io indnducuctotor cr coioils ls in in vevery ry clclosose pe proroxiximmitityyF iF if of one ne of of ththe ce coioils ls isis rotated 90 degrees slowly away from the other the mutual inductance.

rotated 90 degrees slowly away from the other the mutual inductance. 

ppttiioon n !!.. ddeeccrreeaasseess.. 

ppttiioon n "".. rreemmaaiinns s tthhe e ssaammee.. 

ppttiioon n ##.. iinnccrreeaasseess.. #o

#orrrrecect t !!nsnswewer r isis.. ddececrereasaseses.. $xpla

$xplanationnation #oup#oupling ling factor factor %mutu%mutual ial inductanductance& nce& decreadecreases ses to ;to ;ero ero at 9at 90 d0 degreesegrees.. Q

Quuesesttiioon Nn Nuummbberer.. 1155.. !!n in inndduuccttoor ir is ss saiaid td to bo be se saattuuraratteed wd whheenn.. 

ppttiioon n !!.. tthhe ce cuurrrreennt it is s at at a ma maxaximimuumm.. 

ppttiioon "n ".. tthhe ce cuurrrreennt tt thhrroouuggh ih it it is ;s ;eerroo.. p

ptition on ##.. it it wiwill ll no no lolonngeger ar accccepept lt linines es of of flfluux.x. #o

#orrerrect ct !!nsnswewer isr is.. it wilit will no l no lolongnger aer acceccept lpt linines oes of flf fluxux.. $

$xxppllaannaattiioonn NN3366..

12. DC Motor/Generator Theory . 12. DC Motor/Generator Theory .

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Quesestition on NuNummbberer.. 11.. 3n 3n a @a @# # momototorr2 2 ththe se statatotorCrCs ms magagnnetetic ic fifieleld2 d2 dudue te to ao armrmatatururee reaction2 moves.

reaction2 moves. p

ptition on !!.. in in ththe se samame de dirirecectition on of of rorotatatition on of of ththe ae armrmataturure.e. p

ptition on ".". in in ththe oe opppposositite de dirirecectiotion on of rf rototatiation on of of ththe ae armrmatuature.re. 

ppttiioon #n #.. iinntto ao alliiggnnmmenent wt wiitth th thhe e NN!!.. #or

#orrect rect !n!nswswer iser is.. in the oin the oppoppositsite dire directiection oon of rof rotatitation oon of thf the arme armatuature.re. $

$xpxplalananatitionon.. N3N366.. Q

Quuesesttiioon n NNuummbberer.. ''.. ! ! ssmmaall ll aaiir gr gaap p bbeettwweeeen n mmagagnneetitic c ppoollees s rreessuullttss.. p

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p

ptition "on ".. in a sin a strtronongeger fir field eld ththan a lan a lararge age air gir gapap2 fo2 for thr the sae same mme magagnenetitisising fng fororcece.. p

ptition #on #.. in tin the he sasame fme fieield ald as a ls a lararge ge air air gagap2 p2 fofor thr the sae same mme magagnenetitisising ng foforcrce.e. #or

#orrect rect !n!nswswer iser is.. in the samin the same fiee field as ld as a lara large aige air gapr gap2 fo2 for the r the samsame mae magnegnetistising ing forforce.ce. $xpla

$xplanationnation.. =agne=agnetic field tic field %numb%number of fluer of flux linex lines& is ts& is the samhe same regarde regardless oless of distf distanceance between poles. )owever2

between poles. )owever2 the field density %flux density& will increase with a smaller air gap.the field density %flux density& will increase with a smaller air gap. Q

Quuesesttiioon Nn Nuummbberer.. //.. TThhe ee elleectctrromomagagnneettiic bc brarakke ce cooiil il in an an an accttuuaattoor wr woouulld bd bee energised.

energised. p

ptition on !!.. ononly ly at at ththe ie insnstatant nt of of ststarartiting ng anand sd stotoppppining.g. 

ppttiioon n "".. aalll l tthhe e ttiimme e iin n fflliigghhtt.. p

ptition on ##.. oonlnly y wwhhen en ththe ae actctuauatotor ir is s rurunnnininng.g. #o

#orrerrect ct !!nsnswewer isr is.. only wonly whehen thn the ace actutuatator ior is rs rununniningng.. $

$xpxplalananatitionon.. N3N366.. Qu

Quesestition on NuNummbberer.. --.. 3n 3n a sa shuhunt nt wwouound nd didirerect ct cucurrrrenent mt moototor wr witith h a ca coonnststanant vt vooltltagagee field supply2 the tor:ue developed by the motor is.

field supply2 the tor:ue developed by the motor is. 

ppttiioon n !!.. iinnddeeppeennddeennt t oof f llooaadd.. p

ptition on ".". didirerectctly ly prpropoporortitiononal al to to ararmamatuture re cucurrrrenent.t. p

ptition #on #.. ininveversrselely py proropoportrtioionanal to l to ththe are armamatuture cre cururrerentnt.. #o

#orrerrect !ct !nsnswewer is.r is. didirecrectly ptly proropoportrtioional tnal to armo armatuature cure currrrenent.t. $

Quuesesttiioon Nn Nuummbberer.. **.. @@ececrreeaassiinng tg thhe fe fiieelld cd cuurrrrenent it in a n a sshhuunnt mt moottoor wr wiillll.. p

ptition on !!.. ddececrereasase se spepeed ed anand id inncrcreaease se totor:r:uue.e. p

ptition on "".. inincrcreaeasse se sppeeeed ad and nd inincrcreaease se totor:r:ueue.. p

ptition on ##.. inincrcreaeasse se sppeeeed ad and nd ddececrereasase te toror:u:ue.e. #o

#orrerrect ct !!nsnswewer isr is.. inincrecreasase spe speed eed anand ind incrcreasease toe tor:r:ueue.. $xpla

$xplanationnation.. @ecreas@ecreasing thing the field e field current current in a shin a shunt munt motor wiotor will redull reduce the bce the back emack emf in thef in the armature so the armature current will increase giving a rise in tor:ue and the 7E= will armature so the armature current will increase giving a rise in tor:ue and the 7E= will increase as a conse:uence.

increase as a conse:uence. Q

Quuesesttiioon Nn Nuummbberer.. .. TTo o ccaalclcuullatate ge geenneerarattoor or ouuttppuut yt yoou nu neeeed td to ko knnoow tw thhee.. p

ptition on !!.. ararmamatuture sre spepeed aed and nd nunumbmber oer of sf sererieies cos condnducuctotorsrs.. p

ptition on "".. ararmmatatuure re ssppeeeed ad annd fd fieield ld sstrtrenengtgthh.. p

ptition #on #.. ararmamatuture sre spepeed aed and nd nunumbmber oer of pf pararalallelel col condnducuctotorsrs.. #o

#orrerrect ct !!nsnswewer isr is.. armatarmaturure spe speed eed anand fid fieleld sd stretrengngthth.. $

Quesestition on NuNummbberer.. 88.. 3n 3n a sa shuhunt nt mmototoror2 2 if if yyou ou rerevverersse be booth th fifieleld d cucurrrrenent at and nd ththee armature current2 the motor will.

armature current2 the motor will. 

ppttiioon n !!.. ssttoopp.. 

ppttiioon n "".. cchhaanngge e ddiirreeccttiioonn.. p

ptition on ##.. cocontntininue ue to to rurun in in tn thhe se samame de dirirecectitioon.n. #o

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$xplanalanatiotion.n. EroErove it wve it with >ith >lemlemingingCs leCs left haft hand rund rule.le. Q

Quueessttiioon n NNuummbbeerr.. 55.. ! ! ssttaarrtteer r ggeenneerraattoor r hhaas s aa.. p

ptition on !!.. lolow rew resisiststancance see seriries fes fielield ad and nd a loa low rew resisiststanance sce shuhunt nt fiefieldld.. p

ptition on ".". lolow rw resesisistantance ce seseriries es fifield eld anand a d a hihigh gh reresisiststanance sce shuhunt nt fiefieldld.. p

ptition on #.#. hihigh gh reresisiststanance sce serieries es fiefield ld anand a d a lolow rw resesisistatance nce shshununt ft fielield.d. #or

#orrect rect !n!nswswer iser is.. low reslow resististance ance serseries ies fielfield and and a hid a high rgh resiesistastance snce shunhunt fiet field.ld. $

Quesestition on NuNummbberer.. 99.. 3f 3f ththe be brarakke ce coioil l on on an an acactutuatator or mmototor or ggoeoes s opopen en cicircrcuiuit2 t2 ththee actuator will.

actuator will. 

ppttiioon n !!.. rruun n sslloowweerr.. 

ppttiioon n "".. ssttoopp.. p

ptition on ##.. ooveverrArAridide e itits s mmecechahannicical al ststoopsps.. #

#oorrrreecct !t !nnsswweer ir iss.. ssttoopp.. $xpla

$xplanationnation.. The brThe brake coake coil is wiil is wired in red in series series with twith the actuhe actuator moator motor coitor coil. 3t wil. 3t withdrawthdraws as a spring loaded lock to release the actuator when current is applied.

spring loaded lock to release the actuator when current is applied. Qu

Quesestition on NuNumbmberer.. 10..10 ThThe de diaiagrgram am shshowows s a 'a '00 00 B B lolong ng shshununt gt genenereratatoror. . (h(hat at is is ththee voltage dropped across the series resistor,.

voltage dropped across the series resistor,.  ppttiioon n !!.. 00..11' ' BB..  ppttiioon n "".. 00..' ' BB..  ppttiioon n ##.. ''000 0 BB.. #

#oorrrerect ct !!nnsswweer ir iss.. 00..11' ' BB.. $xpla

$xplanationnation.. @onCt l@onCt let the fielet the field confid configuratiguration conon confuse yfuse you. Tou. The 0.0- he 0.0- and 10and 100 ohm re0 ohm resistosistorsrs are part of the generator and can be ignored. Gust consider the 0.0 ohm %the series resistor& are part of the generator and can be ignored. Gust consider the 0.0 ohm %the series resistor& and the load resistor. #alculate current %about '!& then calculate voltage across 0.0 ohm and the load resistor. #alculate current %about '!& then calculate voltage across 0.0 ohm resistor.

resistor. Qu

Quesestition on NuNumbmberer.. 1111.. 3f 3f a ga genenereratator or sspepeed ed is is hahalvlved ed anand td the he fifieleld sd strtrenengtgth ih is ds dououblbleded22 the voltage output will be.

the voltage output will be.  ppttiioon !n !.. uunncchhaannggeedd..  ppttiioon n "".. ddoouubblleedd..  ppttiioon n ##.. hhaallvveedd.. #o

#orrrrecect t !!nsnswewer r isis.. uuncnchhanangeged.d. $

Quesestition on NuNummbberer.. 11'.'. ))ow ow cacan tn the he didirerectctioion on of rf rototatatioion on of a @f a @# e# elelectctriric mc moototor br bee changed,.

changed,. p

ptition !on !.. rereveversrse the ee the eleclectritrical ccal cononnenectictionons to es to eithither ther the fiee field or ald or armrmataturure wine windidingngs.s. p

ptition "on ".. rorotatate tte the phe pososititivive bre brusush oh one ne cocommmmututatator sor segegmementnt.. p

ptition #on #.. ininterterchchanange tge the whe wirires wes whihich cch cononnenect thct the moe mototor to tr to the exhe exteternarnal pol powewer sor soururcece.. #or

#orrect rect !n!nswswer is.er is. reversreverse the ee the electlectricarical conl connecnectiotions to ns to eitheither the fer the fielield or armd or armaturaturee windings.

(7)

$

Quesestition on NuNumbmberer.. 1/1/.. ThThe oe onlnly y prpracactiticacal l memeththod od of of mamainintataininining g a a coconsnstatant nt vovoltltagagee output from an aircraft generator under varying conditions of speed and load is to vary the. output from an aircraft generator under varying conditions of speed and load is to vary the. p

ptition on !!.. sspepeed ed at at whwhicich th thhe ae armrmatatuure re rorotatatetes.s. p

ptition on "".. sstrtrenengtgth h oof f ththe e mmagagnenetitic c fifieleldd.. p

ptition on ##.. nnumumbeber or of cf cononduductctorors is in tn the he ararmmatatuurere.. #o

#orrerrect ct !!nsnswewer isr is.. strenstrengtgth oh of tf the he magmagnenetic tic fifieldeld.. $

Quesestition on NuNumbmberer.. 1-1-.. $l$lecectrtric ic momototors rs arare oe oftften en clclasassisifified ed acaccocordrdining tg to o ththe me metethohod od off connecting the field coils and armature. !ircraft engine starter motors are generally of which connecting the field coils and armature. !ircraft engine starter motors are generally of which type,.

type,. 

ppttiioon n !!.. ##oommppoouunndd.. 

ppttiioon n "".. DDhhuunnt t %%ppaarraalllleell&&.. 

ppttiioon n ##.. DDeerriieess.. #

#oorrrerect ct !!nnsswweer ir iss.. DDeeririeess.. $xpla

$xplanationnation.. Deries Deries motormotors s have have the the highehighest st startistarting ng tor:utor:ue.e. Qu

Quesestition on NuNummbberer.. 11*.*. 3f 3f a ha heaeavy vy mmecechahaninicacal ll loaoad id is rs rememovoved ed frfroom a sm a sererieies ms moototorr.. p

ptition on !!.. ththe spe speeeed wd wilill inl increcreasase ane and td the ahe armrmataturure cue currrrenent wit will ill incncreareasese.. p

ptition on ".". ththe se spepeed ed wiwill ill incncrearease se anand td the he armarmataturure cue currrrenent wt wilill dl decrecreaeasese.. p

ptition on #.#. ththe se spepeed ed wiwill dll decrecreaease se anand td the he armarmataturure ce cururrenrent wt wilill dl dececreareasese.. #or

#orrect rect !n!nswswer iser is.. the speethe speed wid will inll increacrease anse and thd the arme armatuature cure currenrrent wilt will del decreacrease.se. $xpla

$xplanationnation.. Dpeed Dpeed increasincreases and es and increasincreases the bes the back emack emf which f which decreasdecreases the es the armatuarmaturere current.

current. Qu

Quesestition on NuNummbberer.. 11.. 3f 3f ththe ce cororrerect ct susuppplply wy werere ce coonnnnececteted td to a @o a @# s# shuhunt nt mmototoror which had lost its residual magnetism it would.

which had lost its residual magnetism it would. 

ppttiioon n !!.. rruun in in tn thhe re reveveersrse de diirrececttioionn.. 

ppttiioon n "".. ffaaiil l tto o rruunn.. 

ppttiioon n ##.. rruun n nnoorrmmaallllyy.. #o

#orrrrecect !t !nsnswewer ir is.s. run nrun norormmalallyly.. $xp

$xplanalanatiotion.n. 3ts 3ts a moa motortor2 n2 not a ot a gengenerateratorHorH.. Qu

Quesestition on NuNumbmberer.. 1818.. nne pe pururpopose se of of a ga grorowlwler er tetest st is is to to dedetetermrminine e ththe pe preresesencnce oe ofIfI.. 

ppttiioon n !!.. a sa shhoorrtteed ad arrmmaattuurree.. 

ppttiioon n "".. a a bbrrookkeen n ffiieelld d lleeaadd.. 

ppttiioon #n #.. aan on ouuttAAooffAArroouunnd cd coommmmuutatattoorr.. #o

#orrrrecect t !!nsnswewer ir is.s. a shoa shortrted ed ararmamatuturere.. $

(8)

Qu

Quesestition on NuNumbmberer.. 1515.. ThThe pe pururpopose se of of an an enendAdAtrtravavel el mimicrcrososwiwitctch ih in n a la linineaear ar actctuauatotor ir iss to.

to. p

ptition on !!.. reremamain in opopen en anand cd cloloseses as at et end nd trtravavel el ononlyly.. pt

ption ion ".". remremain ain opeopen dn duriuring ng nornormal mal opeoperatiration on and and onlonly cy closlose ie if thf the ae actuactuator tor oveoverrurrunsns its stops.

its stops. p

ptition on #.#. reremamain in clclososed ed anand od opepens ns at at enend td traravevel ol onlnlyy.. #o

#orrerrect !ct !nsnswewer is.r is. remairemain clon closesed and and opd openens at ens at end trad travevel onl onlyly.. $xp

$xplanalanatiotion.n. Dee EalDee Eallett A !lett A !ircrircraft $leaft $lectrictrical Dycal Dystestems2 pg 1-ms2 pg 1-0.0. Q

Quuesesttiioon Nn Nuummbberer.. 1199.. 66iinneeaar ar accttuuaattoorrs us usseed id in an aiirrccraraft ft arare oe off.. p

ptition on !!.. ssplplit it fifieleld d ssererieies s wowounund d tytypepe.. 

ppttiioon n "".. ccoommppoouunnd d wwoouunnd d ttyyppee.. 

ppttiioon #n #.. sspplliit ft fiieelld sd shhuunnt wt woouunnd td tyyppe.e. #o

#orrerrect ct !!nsnswewer isr is.. splisplit ft fielield sd serieries es wowounund td typype.e. $xp

$xplanalanatiotion.n. Dee EalDee Eallett A !lett A !ircrircraft $leaft $lectrictrical Dycal Dystestems2 pg 1-ms2 pg 1-1.1. Q

Quuesesttiioon Nn Nuummbberer.. ''00.. 33f a gf a geenneerraattoor sr sppaarrkkss2 a p2 a poossssiibblle re reeasasoon in iss.. 

ppttiioon n !!.. tthhe be brurussh sh spprriinnggs as arre le loooosse.e. p

ptition on "".. mmagagnenetitic fc flulux x ddefeflelectctining g ththe $e $=>=>.. p

ptition on #.#. ththe be brurushshes es hahave ve bebeen en plplacaced ed aroarounund d ththe me magagnenetic tic cocoilil.. #o

#orrerrect ct !!nsnswewer ir is.s. ththe be brurush sh spspriringngs as are re loloosose.e. $

Quesestition on NuNumbmberer.. '1'1.. 3f 3f ththe fe fieield ld ststrerengngth th of of a ga genenereratator or is is dodoububleled2 d2 anand td the he spspeeeed id iss doubled2 the output $=> will.

doubled2 the output $=> will. 

ppttiioon n !!.. ssttaay y tthhe e ssaammee.. 

ppttiioon n "".. ddoouubbllee.. 

ppttiioon n ##.. ::uuaaddrruuppllee.. #o

#orrrrecect t !!nsnswewer r isis.. ::uauaddruruplple.e. $

Quueessttiioon n NNuummbbeerr.. ''''.. 33n n a @a @# # mmoottoor r tthhe e ppoolle e ppaaiirrs s aarree.. 

ppttiioon n !!.. ccoonnnnecectted ed tto to thhe be brurussh gh geearar.. 

ppttiioon n "".. ppaarrt t oof f tthhe e aarrmmaattuurree.. p

ptition on ##.. emembebedddeded d wiwiththin in ththe e fifieleld d cocoilils.s. #o

#orrerrect ct !!nsnswewer isr is.. embedembeddeded wd witithihin tn the he fiefield ld cocoilils.s. $

Quuesesttiioon n NNuummbberer.. ''//.. ! ! ssereriiees s wwoouunnd d @@# # mmoottoorr2 2 tthhe fe fiieleld d hhaass.. 

ppttiioon n !!.. ffeew w ttuurrnns s oof f tthhiin n wwiirree.. 

ppttiioon "n ".. mmaanny y ttuurrnns s oof tf thhiin wn wiirree.. 

ppttiioon #n #.. ffeew tw tuurrnns s oof tf thhiicck k wwiirree.. #o

(9)

$

Quesestition on NuNummbberer.. ''-.-. @@ououblblining tg the he rurunnnnining tg timime oe of af an en elelectctriricacal ml macachihine ne wowoululdd.. 

ppttiioon n !!.. ddoouubblle e tthhe e ccuurrrreennt t uusseedd.. 

ppttiioon "n ".. ddoouubblle te thhe Je Joouullees s uusseedd.. 

ppttiioon n ##.. ddoouubblle e tthhe e wwaatttts s uusseedd.. #o

#orrrrecect !t !nsnswewer isr is.. doubdouble tle the Jhe Jououleles us usesed.d. $xpla

$xplanationnation.. Eower %Eower %watts& iwatts& is the rate os the rate of usinf using energg energy %Goy %Goules&. ules&. Do douDo doubling bling runnirunning timng timee will not change the power. #urrent is the rate of charge flow A so more charge %coulombs& will not change the power. #urrent is the rate of charge flow A so more charge %coulombs& will be used but not at a faster or slower CrateC.

will be used but not at a faster or slower CrateC. Qu

Quesestition on NuNumbmberer.. '*..'* n n a la linineaear ar actctuauatotorr2 2 ththe fe fieield ld cucutotoff ff cocoil il wiwill ll be be enenererggi;i;eded when.

when. p

ptition on !!.. ononly ly as as ththe ae actctuauatotor cr comommemencnces es momovevemementnt.. 

ppttiioon "n ".. tthhe ae accttuuatatoor ir is s nnoot rt ruunnnniinngg.. 

ppttiioon #n #.. tthhe ae accttuuaattoor ir is rs ruunnnniinngg.. #o

#orrrrecect !t !nsnswewer isr is.. the acthe actutuatator ior is rus runnnnining.g. $xpla

$xplanationnation.. >ield >ield cutofcutoff cof coil is il is believbelieved to ed to be thbe the brake brake coie coil.l. Qu

Quesestition on NuNumbmberer.. ''.. !n !n elelecectrtric ic mmototor or prprododucuces es a fa fororce ce of of * * N N at at a da disistatancnce oe of 0f 0.'.'mm from the centre of rotation and rotates at a speed of 100 revs4sec. The motors output is.

from the centre of rotation and rotates at a speed of 100 revs4sec. The motors output is. 

ppttiioon n !!.. 11000 0 hhoorrsseeppoowweerr.. 

ppttiioon n "".. ''55..- - wwaattttss.. 

ppttiioon n ##.. //11--..' ' wwaattttss.. #o

#orrrrecect t !!nsnswewer ir is.s. '5'5.- .- wawatttts.s. $xpla

$xplanationnation.. Eower Eower in a moin a motor  ttor  tor:ue or:ue  'pi   'pi  revs4revs4sec. Tsec. Tor:or:ue  forue  force  radce  radius.ius. Q

Quueessttiioon n NNuummbbeerr.. ''88.. DDttaarrtteer r mmoottoorrs s aarre e uussuuaallllyy.. 

ppttiioon n !!.. sseerriiees ws woouunndd.. 

ppttiioon "n ".. ccoommppoouunnd wd woouunndd.. 

ppttiioon n ##.. sshhuunnt t wwoouunndd.. #o

#orrrrecect t !!nsnswewer ir is.s. ssererieies ws wouounnd.d. $xpla

$xplanationnation.. Deries Deries wounwound mod motors tors have have the gthe greatest reatest startistarting tong tor:ue.r:ue. Q

Quuesesttiioon Nn Nuummbberer.. ''55.. eneneerarattoor br brurusshhees as arre ne noormrmalallly my madade oe off..  ppttiioon n !!.. sstteeeell..  ppttiioon n "".. ccaarrbboonn..  ppttiioon n ##.. bbrraassss.. #

#oorrrerect ct !!nnsswweer ir iss.. ccaarrbboonn.. $

Quesestition on NuNumbmberer.. '9'9.. !s !s ththe ge genenereratator or loload ad is is inincrcreaeasesed %d %wiwiththin in itits s rarateted d cacapapacicityty&2&2 the voltage will.

(10)

p

ptition on !!.. remremain ain coconsnstantant at and nd ththe ae ampmperaerage ge ououtptput ut wiwill ll dedecrcreasease.e. p

ptition on ".". dedecrcreaease se anand td the ahe ampmpereragage oe oututpuput wt wilill il incncrereasase.e. p

ptition on #.#. remremain ain coconsnstantant at and nd ththe ae ampmperaerage ge ououtptput ut wiwill ll inincrcreaeasese.. #or

#orrect rect !n!nswswer iser is.. remain remain conconstastant ant and tnd the ahe ampmperagerage oue outputput wit will inll increacrease.se. $xpla

$xplanationnation.. The voThe voltage regltage regulator kulator keeps theeps the generate generator voltor voltage outage output the sput the same. #uame. #urrentrrent will increase as the load resistance drops.

will increase as the load resistance drops. Qu

Quesestition on NuNummbberer.. //0.0. TThhe ve vololtatage ge ououtptpuut ot of a f a ggenenereratatoor ir is cs coonntrtroolllled ed byby.. p

ptition on !!.. vvararyyining tg the he cucurrrrenent ot of tf thhe oe oututpputut.. p

ptition on "".. vvararyyining tg the he reresisiststanance ce oof tf the he ooututpputut.. p

ptition on ##.. vvararyyining g ththe e cucurrrrenent t of of ththe fe fieieldld.. #o

#orrerrect ct !!nsnswewer isr is.. varyvaryining tg the he cucurrerrent nt of of ththe fie fieleld.d. $

Quesestition on NuNumbmberer.. /1/1.. ThThe ce cururrerent nt flflowowining g in in ththe ae armrmataturure e of of a a @# @# momototor ir is s e:e:uaual l toto.. p

ptition on !!.. %a%apppplielied vd vololtstsAgAgenenererateated vd vololtsts& 4 & 4 ararmamatuture re resresisistatancnce.e. p

ptition on ".". %a%apppplielied d vovoltsltsAgAgenenererateated vd vololtsts&  &  armarmataturure re resesisistantance.ce. p

ptition on #.#. apappliplied ed vovolts lts K K gegeneneratrated ed vovoltlts s 4 a4 armarmatuture re resresisistatancnce.e. #or

#orrect rect !n!nswswer iser is.. %appli%applied ved voltoltsAgsAgeneeneraterated vod voltslts& 4 ar& 4 armatmature ure resresististancance.e. $xpla

$xplanationnation.. hms lhms law 3  B47aw 3  B47. B. Booltage in tltage in the armathe armature is thure is the appliee applied voltad voltage A back emge A back emff %generated voltage&.

%generated voltage&. Qu

Quesestition on NuNumbmberer.. /'/'.. (h(hat at dedevivice ce is is usused ed to to coconvnverert at altlterernanatiting ng cucurrrrenent2 t2 whwhicich h hahass been induced into the loops o

been induced into the loops of the rotating armature of a @# generator into direct current as itf the rotating armature of a @# generator into direct current as it leaves the generator,.

leaves the generator,. 

ppttiioon n !!.. !!n n iinnvveerrtteerr.. 

ppttiioon n "".. ! ! ccoommmmuuttaattoorr.. 

ppttiioon n ##.. ! ! rreeccttiiffiieerr.. #o

#orrrrecect !t !nsnswewer isr is.. ! ! cocommmmututatatoorr.. $

Quesestition on NuNumbmberer.. ////.. (h(hicich oh of tf the he fofollllowowining ig is ns not ot onone oe of tf the he pupurprpososes es of of ininteterprpololeses in a generator,.

in a generator,. 

ppttiioon !n !.. vveercrcoomme ae armrmatatuurre re reeacacttiioonn.. 

ppttiioon "n ".. 77ededuuce ce aarcrciinng ag at tt thhe be brruusshheess.. 

ppttiioon #n #.. 77eedduucce fe fiieelld sd sttrreennggtthh.. #o

#orrrrecect !t !nsnswewer isr is.. 7edu7educe fce fieield sld strtrenengtgth.h. $xpla

$xplanationnation.. NTC onNTC one of the pe of the purposurposes. Tes. The purhe purpose opose of interpof interpoles is to oles is to overcomvercome %in facte %in fact CpreventC& armature reaction. !rmature reaction is partially responsible for arcing at the CpreventC& armature reaction. !rmature reaction is partially responsible for arcing at the brushes.

brushes. Q

Quuesesttiioon Nn Nuummbberer.. //--.. TTo o rreveveerrsse te thhe de diirreectctiioon on of a sf a seeririees ms moottoorr.. p

(11)

p

ptition on ".". ththe de direirectiction on of of ththe ce cururrerent nt ththrorougugh th the he fifieleld id is rs reveverserseded.. p

ptition on ##.. a a ssececoond nd seseriries es fifieleld d is is fifitttteded.. #o

#orrerrect ct !!nsnswewer isr is.. a seca seconond sd sereries ies fifieleld id is fs fitittedted.. $

Quesestition on NuNummbberer.. //*.*. TThhe ce cururrerent nt coconnsusumemed d by by a a @# @# ststararteter mr mototoor wr wilill.l. p

ptition on !!.. remremain ain relrelatativively ely coconsnstantant ot ovever tr the he ststartartining sg spepeed ed rarangnge.e. p

ptition on ".". dedecrcreaease se as as ththe e enengigine ne spspeeeed d inincrcreaeaseses.s. p

ptition on #.#. inincrcreaease se as as ththe e enengigine ne spspeeeed d inincrcreaeaseses.s. #o

#orrerrect !ct !nsnswewer is.r is. decredecreasase as te as the ehe engnginine spe speeeed ind increcreasaseses.. $

Quueessttiioon Nn Nuummbbeerr.. //.. ))oow aw arre ge geenneerraattoorrs rs raatteedd,,.. 

ppttiioon n !!.. 3m3mppeeddanancce ae at rt raateted vd voollttagagee.. 

ppttiioon n "".. !!mmppeerrees s aat t rratateed d vvoollttaaggee.. 

ppttiioon #n #.. ((aatttts as at rt raatteed vd voollttaaggee.. #o

#orrrrecect !t !nsnswewer isr is.. (aatt( tts as at rat rateted vod voltltagage.e. $

Quuesesttiioon n NNuummbberer.. //88.. @@uue e tto o aarrmmaattuure re rreaeactctiioon n iin n a a @@# # mmoottoorr.. p

ptition on !!.. ththe lee leadadining pg polole tie tips ps arare me magagnenetiticacalllly wy weaeakekenened.d. p

ptition "on ".. ththe tre traiaililing ng popole tle tipips as are mre magagnenetiticacalllly wy weaeakekenened.d. p

ptition #on #.. ththe mae magngnetietic flc flux ux is is resrestotorered by d by momoviving ng ththe =Ne =N! ! totowawardrds ts the he N!N!.. #or

#orrect rect !n!nswswer ier is.s. the trathe trailiniling pg pole ole tiptips as are mre magnagnetietically cally weaweakenkened.ed. $

Quesestition on NuNumbmberer.. /5/5.. DoDome me elelecectrtric ic momototors rs hahave ve twtwo o sesets ts of of fifieleld d wiwindndining wg wouound nd inin opposite directions so that the.

opposite directions so that the. p

ptition on !!.. spspeeeed od of thf the me mototor cor can ban be moe more cre clolosesely cly conontrtrololleled.d. p

ptition on ".". momototor cr can an be be opopereratated ed in in eieithther er didirerectctioion.n. p

ptition on #.#. popowewer or oututpuput ot of tf the he momototor cr can an be be momore re cloclosesely ly cocontntrolrolleled.d. #o

#orrerrect !ct !nsnswewer is.r is. motomotor can r can be obe opeperarateted in ed in eititheher dir direcrectitionon.. $xp

$xplanalanatiotion.n. DpeDpecificificallcally y serseries ies motmotorsors.. Qu

Quesestition on NuNummbberer.. //9.9. ((hahat t popolalaririty ty ddo o ininteterprpololes es tatake ke in in a a @# @# mmototoror,.,. p

ptition on !!.. $$itithherer2 p2 prorovividded ed ththey ey lalay oy on tn the he =N=N!!.. p

ptition "on ".. ThThe sae same me as tas the nhe nexext mt main ain popole ale ahehead iad in tn the dhe dirirecectiotion on of rof rotatatiotion.n. p

ptition #on #.. ThThe sae same me as tas the nhe nexext mt main ain popole ble behehinind id in thn the die direcrectition on of rof rototatatioion.n. #or

#orrect rect !n!nswswer is.er is. ThThe same same as the as the nexe next mait main pon pole bele behinhind in thd in the dire directiection of ron of rotaotatiotion.n. $xpla

$xplanationnation.. The intThe interpole merpole must pulust pull back thl back the magnee magnetic fieldtic field. 3n a mot. 3n a motor2 or2 the magthe magnetic fielnetic fieldd deflects in the opposite direction to the armature.

(12)

Qu

Quesestition on NuNummbberer.. --0.0. ((hahat it is ts thhe pe pririncncipipal al adadvvanantatagge oe of tf the he ssererieiesAsAwowounund @d @## motor,.

motor,. p

ptition on !!.. DDuiuitatablble fe for or coconnststanant st spepeed ed uusse.e. 

ppttiioon n "".. ))iiggh h ssttaarrttiinng g ttoorr::uuee.. 

ppttiioon n ##.. 66oow w ssttaarrttiinng g ttoorr::uuee.. #o

#orrrrecect !t !nsnswewer isr is.. )igh )igh ststarartiting ng totor:r:ueue.. $

Quesestition on NuNumbmberer.. -1-1.. 3n3nteterprpolole e wiwindndinings gs fifitttted ed to to @# @# seseriries es wowounund d gegeneneraratotors rs arare.e. 

ppttiioon n !!.. iin sn seeririees ws wiitth th thhe ae arrmmatatuurere.. 

ppttiioon "n ".. iin sn seerriiees ws wiitth th thhe fe fiieelldd.. 

ppttiioon #n #.. iin pn paararallllel el wwiitth th thhe ae armrmaattuurree.. #o

#orrrrecect !t !nsnswewer isr is.. in serin serieies wis with tth the ahe armrmataturure.e. $xpla

$xplanationnation.. 3nterp3nterpole wiole windingndings are alws are always in ays in series series with twith the armathe armature2 sure2 so they o they carry thcarry thee same current as the armature.

same current as the armature. Qu

Quesestition on NuNummbberer.. --'.'. ((hahat pt poolalaririty ty ddo io intntererppololes es tatake ke in in a @a @# g# genenereratatoror,.,. p

ptition on !!.. ththe sae same me as tas the nhe nexext mt main ain popole ble behehinind in d in ththe de direirectctioion of n of rorotattatioion.n. p

ptition on "".. eieiththerer2 p2 prorovividdining tg thhey ey lalay oy on =n =..N.N.!.!. p

ptition #on #.. ththe sae same me as tas the nhe nexext mt main ain popole ale ahehead iad in tn the dhe direirectiction on of rof rototatiationon.. #or

#orrect rect !n!nswswer iser is.. the same athe same as ths the nexe next mait main pon pole bele behinhind in td in the dhe direcirectiotion of rn of rotaotationtion.. $xpla

$xplanationnation.. n a gn a generatoenerator2 r2 the fiethe field is dld is deflected eflected in thin the same de same directioirection as thn as the armatue armaturere rotates. The interpoles must drag back the field.

rotates. The interpoles must drag back the field. Qu

Quesestition on NuNummbberer.. --/./. TThhe me metethohod md mosost ot oftften en uusesed id in on ovverercocommining tg thhe ee effffecect ot off armature reaction is through the use of.

armature reaction is through the use of. 

ppttiioon n !!.. sshhaaddeed d ppoolleess.. 

ppttiioon n "".. iinntteerrppoolleess.. p

ptition #on #.. drdrumumAwoAwounund armd armatuatureres in cos in combmbininatiation won with a nith a negegatiativevely coly connnnecected sted serierieses field.

field. #o

#orrrrecect t !!nsnswewer ir is.s. ininteterprpooleles.s. $

Quesestition on NuNumbmberer.. --..-- ThThe se statartrtining cg cururrerent nt of of a sa sererieiesAsAwowounund @d @# # momototorr2 2 in in papassssiningg through both the field and

through both the field and armature windings produces a.armature windings produces a. p

ptition on !!.. sspepeed ed slsligighthtly ly hhigigheher whr when uen unlnlooadadeded.. 

ppttiioon n "".. hhiiggh h ssttaarrttiinng g ttoorr::uuee.. 

ppttiioon n ##.. lloow w ssttaarrttiinng g ttoorr::uuee.. #o

#orrrrecect !t !nsnswewer isr is.. high high ststarartiting ng totor:r:ueue.. $xpla

$xplanationnation.. !t low s!t low speed %ipeed %i.e starti.e starting& theng& there is a very re is a very high cuhigh current in trrent in the armathe armature %due ture %due too no backAemf&. Dince the field is in series with the armature2 the same high current flows in it2 no backAemf&. Dince the field is in series with the armature2 the same high current flows in it2 resulting in a very high tor:ue.

(13)

Qu

Quesestition on NuNumbmberer.. -*-*.. TTo o inincrcreaease se ththe se spepeed ed of of a sa shuhunt nt momototor a r a reresisiststanance ce is is plplacaceded.. 

ppttiioon n !!.. iin n ppaararallllel el wwiitth h tthhe e ffiieleldd.. 

ppttiioon #n #.. iin sn seeririees s wwiitth h tthhe ae arrmmatatuurere.. #o

#orrrrecect !t !nsnswewer isr is.. in sein seriries es wiwith th ththe fie fieleld.d. $xpla

$xplanationnation.. !n app!n apparent anarent anomalyomaly. 3nc. 3ncreasinreasing the fielg the field resisd resistance dectance decreases treases the fieldhe field strength which reduces the backAemf in the armature. !rmature current therefore increases strength which reduces the backAemf in the armature. !rmature current therefore increases and its speed increases.

and its speed increases. Qu

Quesestition on NuNumbmberer.. --.. ! ! '0'00 0 vovolt lt momototor ir is s tatakiking ng 10 10 amampepereres s ararmamatuture re cucurrrrenent2 t2 ththee armature resistance is 0.1 ohm. The "ackA$=> under these conditions will be.

armature resistance is 0.1 ohm. The "ackA$=> under these conditions will be.  ppttiioon n !!.. ''001 1 vvoollttss..  ppttiioon n "".. 11999 9 vvoollttss..  ppttiioon n ##.. 1 1 vvoolltt.. #

#oorrrerect ct !!nnsswweer ir iss.. 11999 v9 voollttss.. $

Quesestition on NuNumbmberer.. -8-8.. (h(hat at is is a a memeththod od usused ed fofor r rereststororining g gegeneneraratotor fr fieield ld reresisidudualal magnetism,.

magnetism,. 

ppttiioon n !!.. $$nneerrggii;;e te thhe ae arrmmaattuurree.. 

ppttiioon n "".. >>llaassh h tthhe e ffiieellddss.. 

ppttiioon #n #.. 77eesseeaat tt thhe be brruusshheess.. #o

#orrrrecect !t !nsnswewer isr is.. >>lalassh th the fhe fieieldlds.s. $

Quesestition on NuNumbmberer.. -5-5.. ! ! hihigh gh susurgrge oe of cf cururrerent nt is is rere:u:uirired ed whwhen en a @a @# # elelecectrtric ic momototor ir iss first started. !s the speed of the motor

first started. !s the speed of the motor increase.increase. p

ptition on !!.. ththe ce couountnter er ememf df dececrereasases es prpropoporortitiononalallyly.. p

ptition on ".". ththe ae apppplilied ed ememf if incncrereasases es prpropoporortitiononalallyly.. p

ptition #on #.. ththe coue countnter emer emf buf buililds uds up anp and opd oppoposeses ths the ape applplied ied ememf2 thf2 thus rus rededucucining thg thee current flow through the armature.

current flow through the armature. #or

#orrect rect !n!nswswer is.er is. the counthe counter emter emf buif builds ulds up and p and oppopposeoses the as the applpplied eied emf2 tmf2 thus hus redreduciucingng the current flow through the armature.

the current flow through the armature. $

Quuesesttiioon n NNuummbberer.. --99.. !iirc! rcrraaft ft ggeenneerarattoorrs s aarre e ccooooleled d byby.. 

ppttiioon n !!.. ffuueel l ccoooolliinng g rraaddiiaattoorsrs.. p

ptition on ".". oioil cl cooooliling ng raradidiatatorors as arorounund td the he mamain in bobodydy.. 

ppttiioon n ##.. rraam m aaiirr.. #

#oorrrerect ct !!nnsswweer ir iss.. rram am aaiirr.. $

(14)

pt

ption ion !.!. the the volvoltagtage re reguegulatlator or is is conconnectnected ed to to the the shushunt nt fielfield ad after fter the the stastart rt cyccycle le isis completed.

completed. p

ptition "on ".. ththe vole voltatage rege regugulalatotor conr contrtrolols ths the stae start sert se:u:uenence duce duriring eng engnginine stae startrtining.g. p

ptition #on #.. ththe see seriries es cocoil iil is os opepen cn circircuiuit dut durinring tg the ehe engnginine ste start art sese:u:uenencece.. #or

#orrect rect !n!nswswer is.er is. the voltthe voltage rage reguegulatolator is cor is connennected tcted to the so the shunhunt fiet field afld after thter the stae start cyrt cyclecle is completed.

is completed. $

Quesestition on NuNumbmberer.. *1..*1 3f 3f ththe fe fieield ld cucurrrrenent tt to o a a shshununt t wowounund d @# @# momototor r is is dedecrcreaeasesedd when operating at a constant load2 the motor speed will.

when operating at a constant load2 the motor speed will. 

ppttiioon n !!.. rreedduuccee.. 

ppttiioon n "".. nnoot t cchhaannggee.. 

ppttiioon n ##.. iinnccrreeaassee.. #

#oorrrerect ct !!nnsswweer ir iss.. iinnccrereaasse.e. $xpla

$xplanationnation.. This mThis may seem stay seem strangerange2 but de2 but decreasincreasing the fielg the field strend strength of a sgth of a shunt mhunt motor willotor will decrease the back emf of the armature and hence increase the current through the armature. decrease the back emf of the armature and hence increase the current through the armature. This in turn increases the armature speed.

This in turn increases the armature speed. Qu

Quesestition on NuNumbmberer.. *'..*' 3f 3f a ma mototor or is is spspininnining ng at at *0 *0 cycyclcles es peper sr sececonond2 d2 hohow w lolong ng is is 11 cycle of the output,.

cycle of the output,.  ppttiioon n !!.. **0 0 sseeccoonnddss..  ppttiioon "n ".. 00..55/ s/ seeccoonnddss..  ppttiioon #n #.. 00..00' s' seeccoonnddss.. #o

#orrrrecect t !!nsnswewer ir is.s. 00.0.0' s' sececoonndsds.. $xp

$xplanalanatiotion.n. TiTime me perperiod iod  1 14fr4fre:ue:uencyency.. Q

Quuesesttiioon n NNuummbberer.. **//.. 33n n a aa an n @@# m# moottoorr2 2 tthhe re roottaattiioon n oof tf thhe =e =NN!!.. p

ptition on !!.. is is opoppoposisite te to to ththe re rototatatioion on of tf the he ararmamatuturere.. p

ptition on ".". is is slsligighthtly ly lesless ss spepeed ed ththan an ththe re rototatatioion on of tf the he armarmatuature.re. p

ptition on #.#. is is ththe se samame ae as s ththe re rototatatioion n of of ththe ae armrmataturure.e. #o

#orrerrect !ct !nsnswewer is.r is. is oppis opposositite to te to the rohe rotatatiotion of tn of the ahe armrmatatureure.. $xpla

$xplanationnation.. The fiThe field in a eld in a motomotor reacts tr reacts to the ao the armature rmature currencurrent by Cdt by CdistoristortingC tingC in thein the opposite direction to the armature A called armature reaction.

opposite direction to the armature A called armature reaction. Qu

Quesestition on NuNummbberer.. **-.-. 3n 3n a wa wavave we wouound nd ggenenereratatoor wr witith - ph - pololeses2 w2 whahat wt wouould ld bbe te thhee minimum number of brushes,.

minimum number of brushes,.  ppttiioon n !!.. --..  ppttiioon n "".. ''..  ppttiioon n ##.. 55.. #

#oorrrreecct t !!nnsswweer ir iss.. ''.. $

Quesestition on NuNumbmberer.. ****.. ! ! wiwire re is is rorotatateted td thrhrouough gh a ma magagnenetitic fc fieieldld. T. To o gigive ve @# @# it it mumustst be connected to.

(15)



ppttiioon n !!.. a ca coommmmuuttaattoorr.. 

ppttiioon n "".. sslliip p rriinnggss.. 

ppttiioon n ##.. a a rreeccttiiffiieerr.. #o

#orrrrecect t !!nsnswewer ir is.s. a coma commumutatatotorr.. $xp

$xplanalanatiotion.n. ! c! commommutatutator turor turns !ns !# to @# in a gene# to @# in a generatorator.r. Qu

Quesestition on NuNummbberer.. **.. 3f 3f ththe se supupplply y to to a a @# @# shshununt t momototor r wawas s rereveversrseded.. p

ptition on !!.. it it wowoululd rd rototatate ie in tn the he sasamme de dirirecectitioon.n. 

ppttiioon n "".. iit t wwoouulld d ffaaiil l tto o rruunn.. p

ptition on #.#. it it wowoululd d rorotatate te in in ththe oe opppposositite de dirirecectitionon.. #o

#orrerrect ct !!nsnswewer isr is.. it wouit would rld rototate ate in tin the she samame die direcrectiotion.n. $

Quesestition on NuNummbberer.. **8.8. ! ! ssererieies ms moototor dr drarawws a hs a higigh ch cururrerent nt on on sstatartrt2 a2 and nd ththen en ththee current reduces. This is due to.

current reduces. This is due to. p

ptition on !!.. ththe re resesisistantance ce of of ththe fe fielield ad and nd ththe ae armrmatuature re in in seserieries.s. p

ptition "on ".. ththe ree resisiststanance oce of thf the fie fieleld ad and and armrmataturure in e in papararallllelel.. 

ppttiioon n ##.. tthhe e bbaacck k $$==>>.. #o

#orrrrecect t !!nsnswewer ir is.s. ththe be bacack $k $=>=>.. $

Quuesesttiioon Nn Nuummbberer.. **55.. 33nntteerprpoolles es iin a @n a @# g# geennereraattoor ar arre ce coonnnneectcteedd.. 

ppttiioon n !!.. iin sn seeririees ws wiitth th thhe ae arrmmatatuurere.. 

ppttiioon #n #.. iin pn paararallllel el wwiitth th thhe ae armrmaattuurree.. #o

#orrrrecect !t !nsnswewer isr is.. in serin serieies wis with tth the ahe armrmataturure.e. $

Quesestition on NuNummbberer.. **9.9. 3n 3n a @a @# g# genenereratatoorr2 t2 the he efeffefect ct of of ararmmatatuure re rereacactitioon mn may ay bebe reduced by moving the brush gear.

reduced by moving the brush gear. p

ptition on !!.. in in ththe de dirirectectioion on of af armrmataturure re rototatiation on totowawardrds ts the he =N=N!.!. 

ppttiioon n "".. ffrroom m ==NN! ! tto o NN!!.. p

ptition on #.#. agagainainst st ththe de dirirecectiotion on of af armrmatuature re rorotatatition on totowawardrds ts the he =N=N!.!. #or

#orrect rect !n!nswswer iser is.. in the din the direcirectiotion of n of armarmatuature rore rotatitation ton towaowards rds the the =N!=N!.. $xpla

$xplanationnation.. The =NThe =N! l! leads theads the ND in a ge ND in a generatenerator. or. The brThe brusheushes shous should be puld be put on thet on the =N!.

=N!. Qu

Quesestition on NuNummbberer.. 0.0. TThhe we winindidinngs gs emembbededdded ed in in ththe pe polole fe facaces es of of a @a @# g# genenereratatoorr are.

are. 

ppttiioon !n !.. ccoommmmuuttaattiinng cg cooiillss.. 

ppttiioon n "".. iinntteerrppoolleess.. 

ppttiioon n ##.. ccoommppeennssaattiinng g wwiinnddiinnggss.. #o

#orrrrecect !t !nsnswewer is.r is. compcompenensasatiting wng winindidingngs.s. $

(16)

Q

Quuesesttiioon n NNuummbberer.. 11.. ! !   ppoolle e wwaavveeAwAwoouunnd d ggeennereraattoor r hhaass..  ppttiioon n !!.. / / bbrruusshheess..  ppttiioon n "".. ' ' bbrruusshheess..  ppttiioon n ##..   bbrruusshheess.. #

#oorrrerect ct !!nnsswweer ir iss.. ' bru' brusshheess.. $xpla

$xplanationnation.. ! ! waveAwwaveAwound gound generatoenerator needs r needs only ' bonly ' brushrushes regares regardless odless of the numf the number ofber of poles2 but some may have m

poles2 but some may have more for increased efficiency.ore for increased efficiency. Q

Quuesesttiioon Nn Nuummbberer.. ''.. !!rmrmaattuure re rreeaactctiioon in in a @n a @# g# geenneerarattoor cr cauausseess.. p

ptition on !!.. =N=N! ! to mto movove in te in the ohe opppposositite die direrectctioion of rn of rototatatioion.n. p

ptition on ".". =N=N! ! to to momove ve in in ththe de dirirecectition on of of rorotatatitionon.. p

ptition on #.#. NN! ! to to momove ve in in ththe de dirirecectition on of of rorotatatitionon.. #o

#orrerrect !ct !nsnswewer is.r is. =N! =N! to mto movove in te in the dhe direirectiction oon of rof rotattatioion.n. $

Quuesesttiioon Nn Nuummbberer.. //.. 33n a n a @@# m# moottoorr2 b2 baacckkA$A$==> r> riisses es iif tf thhe me moottoorr.. 

ppttiioon n !!.. ssppeeeed d ffaallllss.. 

ppttiioon "n ".. ssppeeeed d ffaallooaad d rriisseess.. 

ppttiioon n ##.. ssppeeeed d rriisseess.. #o

#orrrrecect t !!nsnswewer ir is.s. sspepeed ed ririsseses.. $xp

$xplanalanatiotion.n. "A$"A$=> is d=> is due to geue to generneratoator actir action in thon in the motoe motor.r. Qu

Quesestition on NuNummbberer.. -.-. ! ! @# @# gegennereratatoor ar armrmatatuure re hhas as  p pololes es anand id is ls lap ap wowounundd. T. Thhee number of brushes re:uired are.

number of brushes re:uired are.  ppttiioon n !!.. ''..  ppttiioon n "".. //..  ppttiioon n ##.. .. #

#oorrrreecct t !!nnsswweer ir iss.. .. $xpla

$xplanationnation..  pole poles is / pais is / pairs. 6ap rs. 6ap wound wound generagenerators re:tors re:uire 1 pauire 1 pair of bruir of brushes fshes for each paor each pair ir of poles.

of poles. Q

Quueessttiioon Nn Nuummbbeerr.. **.. 77eeaaccttiivve se sppaarrkkiinng ig is rs reedduucceed bd byy.. 

ppttiioon n !!.. iinntteerrppoolleess.. 

ppttiioon n "".. ccoommppeennssaattiinng g wwiinnddiinnggss.. 

ppttiioon n ##.. aauuxxiilliiaary ry wwiinnddiinnggss.. #o

#orrrrecect t !!nsnswewer ir is.s. ininteterprpooleles.s. $xpla

$xplanationnation.. 3nterp3nterpoles Croles CreduceC educeC armatuarmature reactiore reaction %whin %which cauch causes reacses reactive stive sparkinparking&.g&. #ompensating windings CpreventC armature reaction.

#ompensating windings CpreventC armature reaction. Q

Quueessttiioon n NNuummbbeerr.. .. TThhe e bbaacckkAA$$==> > iin n a a @@# # mmoottoor r iiss.. 

ppttiioon n !!.. ee::uual al tto o tthhe e aappppllieied d $$==>>.. 

(17)



ppttiioon #n #.. ggrereatateer tr thhan an tthhe ae apppplliieed $d $==>>.. #o

#orrerrect ct !!nsnswewer ir is.s. less less ththan an ththe ae apppplielied $d $=>=>.. $

Quesestition on NuNumbmberer.. 8..8 ThThe fe flulux dx denensisity ty of of a ma magagnenetitic fc fieield ld is is 1.1.*T*T. . TThe he lelengngth th of of ththee conductor in the field is ' m and the current flowing through the conductor is * amps. The conductor in the field is ' m and the current flowing through the conductor is * amps. The force on the conductor is.

force on the conductor is. 

ppttiioon n !!.. 00..  NNeewwttoonnss.. 

ppttiioon n "".. 11* * NNeewwttoonnss.. 

ppttiioon #n #.. //..88* N* Neewwttoonnss.. #o

#orrrrecect t !!nsnswewer ir is.s. 11* * NeNewtwtonons.s. $x

$xplplananatatioion.n. >  ">  "3l  13l  1.*  .*  *  '  *  '  1*1*N.N. Qu

Quesestition on NuNumbmberer.. 55.. ! ! @# @# shshununt mt mototor or hahas s '5 '5 vovoltlts s apapplplieied. d. ThThe ce cururrerent nt tatakeken n frfromom the armature of ' ohms resistance is 1 amp. The "ackA$=> is.

the armature of ' ohms resistance is 1 amp. The "ackA$=> is.  ppttiioon n !!.. ''  BB..  ppttiioon n "".. //0 0 BB..  ppttiioon n ##.. ''8 8 BB.. #

#oorrrreecct t !!nnsswweer ir iss.. '' B B.. $xpla

$xplanationnation.. ToTotal B tal B  3  7  1  '  'B 3  7  1  '  'B. . Do 'B Do 'B "A$=> "A$=> must bmust be generate generated by thed by thee generator action.

generator action. Qu

Quesestition on NuNummbberer.. 9.9. 3n 3n a ma mototoror2 2 ararmmatatuure re rereacactitioon cn cauauseses ts the he =N=N! ! to to mmooveve.. p

ptition on !!.. agagaiainsnst tt the he didirerectctioion on of rf rootatatitioon.n. 

ppttiioon "n ".. iin tn thhe de diirrececttiioon on of rf roottaattiioonn.. 

ppttiioon n ##.. tto o tthhe e NN!!.. #o

#orrerrect ct !!nsnswewer isr is.. againagainst st ththe die direrectiction on of of rorotattatioion.n. $

$xpxplalananatitionon.. N3N366..

Q

Quueessttiioon n NNuummbbeerr.. 8800.. TThhe e ddiiaaggrraam m sshhoowwn n iis s aa..



ppttiioon n !!.. sshhuunnt t wwoouunnd d mmaacchhiinnee.. p

ptition on "".. sshohort rt shshununt ct comompopounund wd woounund md macachihinne.e. p

ptition on ##.. lolong ng sshuhunt nt cocommpopounund wd wouound nd mmacachihinne.e. #o

#orrerrect ct !!nsnswewer isr is.. lolong sng shuhunt cnt comompopounund wod wounund md machachinine.e. $

(18)

Qu

Quesestition on NuNummbberer.. 881.1. 3n 3n a ga genenereratator or sysyststemem2 a 2 a ststababilili;i;ining wg wininddining ig is us usesedd.. p

ptition on !!.. in sin sererieies ws witith th the fhe fieield tld to po prerevevent ont oscscilillalatitionons.s. 

ppttiioon n "".. tto o ccoonnttrrool l oouuttppuut t ccuurrrreenntt.. 

ppttiioon #n #.. tto po prreveveennt vt vooltltaagge oe ovverersshhoooott.. #o

#orrerrect ct !!nsnswewer ir is.s. to prto prevevenent vt vololtatage ge ovoversershohootot.. $xpla

$xplanationnation.. Dee #!3Dee #!3E $$E $$641A'. 641A'. The stThe stabili;abili;ing wining winding pding picks up icks up a Crate of cha Crate of changeC froangeC fromm the output of an !# brushless generator and damps out voltage overshoot and

the output of an !# brushless generator and damps out voltage overshoot and preventsprevents system oscillation. The pickup is an induction coil

system oscillation. The pickup is an induction coil wound around the output so is NT wiredwound around the output so is NT wired in series.

in series. Qu

Quesestition on NuNummbberer.. 88'.'. ((hahat t papart rt oof a f a @# @# mmototor or wwouould ld yyou ou fifind nd ththe pe pololeses,.,.  ppttiioon n !!.. bbrruusshheess..  ppttiioon n "".. rroottoorr..  ppttiioon n ##.. ssttaattoorr.. #

#oorrrerect ct !!nnsswweer ir iss.. ssttaattoror.. $xpla

$xplanationnation.. The poThe poles are a les are a part opart of the fif the field A wheld A which is ich is the stathe stator on tor on a @# moa @# motortor.. Qu

Quesestition on NuNumbmberer.. 8/8/.. ThThe me maiain n adadvavantntagage e of of a a ststararteterArAgegeneneraratotor or ovever r coconvnvenentitiononalal units is.

units is. p

ptition on !!.. it it cacan pn proroduduce ce a ga grereatater er ppowower er ooututpputut.. p

ptition "on ".. fofor thr the sae same pme powower oer oututpuput tht therere is a we is a weieighght redt reducuctition aon and tnd the she statarterter drr drivivee remains engaged.

remains engaged. p

ptition #on #.. fofor thr the sae same pme powower oer oututpuput tht therere is a e is a weweigight rht rededucuctition aon and nd ththe dre drivive ise is constantly engaged.

constantly engaged. #or

#orrect rect !n!nswswer is.er is. for the safor the same pome power ower outputput thut there is ere is a weia weight rght redueductiction anon and the sd the startarterter drive remains engaged. 7 for the same power output there is a weight reduction and the drive remains engaged. 7 for the same power output there is a weight reduction and the drive is constantly engaged.

drive is constantly engaged. $

Quesestition on NuNumbmberer.. 8-..8- !n !n !!.#.#. . shshununt wt wouound nd momototor sr somometetimimes es ususes es a va vololts ts drdropoppipingng resistor. The resistor would be.

resistor. The resistor would be. 

ppttiioon n !!.. iin sn seerriiees ws wiitth th thhe fe fiieelldd.. 

ppttiioon n "".. iin n sseeririees s wwiitth h tthhe e ssuupppplyly.. 

(19)

#o

#orrrrecect !t !nsnswewer isr is.. in serin serieies wis with tth the she supupplplyy.. $xpla

$xplanationnation.. =ust b=ust be referrine referring to a unig to a universal versal motor %!motor %!# shu# shunt wount wound,& Tnd,& The volthe volts drops droppingping resistor is placed in

resistor is placed in series with the supply.series with the supply. Q

Quuesesttiioon n NNuummbberer.. 88**.. ##oommmmututaattoor r rriipppplle e ccaan n bbe e rreedduucceed d byby.. p

ptition on !!.. inincrcreaeassining gg genenereratatoor fr frere:u:uenencycy.. 

ppttiioon n "".. tthhe e uusse e oof f a a riripppplle e ffiillteterr.. p

ptition on ##.. a ra reesisisstotor ir in sn sererieies ws witith th thhe ae armrmataturure.e. #o

#orrrrecect !t !nsnswewer isr is.. the usthe use oe of a rf a ripipplple fie filtlterer.. $xpla

$xplanationnation.. ! ! ripple fripple filter is milter is made of a capade of a capacitor in pacitor in parallel warallel with the gith the generatoenerator outpr output andut and an inductor in series with the generator output.

an inductor in series with the generator output. Q

Quuesesttiioon Nn Nuummbberer.. 88.. 33n a n a @@# m# moottoor tr thhe ie inntteerrppoolles es aarre pe paarrt ot of tf thhe.e. 

ppttiioon n !!.. rroottoor r aasssseemmbbllyy.. 

ppttiioon n "".. ssttaattoor r aasssseemmbbllyy.. 

ppttiioon n ##.. ffiieelldd.. #

#oorrrerect ct !!nnsswweer r iiss.. ffiieleldd.. $xpla

$xplanationnation.. 3nterp3nterpoles are a poles are a part of the art of the >ield. 7>ield. 7otor anotor and Dtatod Dtator are terms fr are terms for !or !# moto# motors.rs.

Q

Quueessttiioon n NNuummbbeerr.. 8888.. !!rrmmaattuurre e rreeaaccttiioon n iiss.. 

ppttiioon n !!.. tthhe =e ===> o> oppppoossiinng rg roottaattiioonn.. p

ptition on "".. ddue ue to to ddirirty ty or or wwoorn rn cocommmmututatatoorr.. 

ppttiioon #n #.. rreeaaccttiivve se sppaarrkkiinngg.. #o

#orrerrect ct !!nsnswewer ir is.s. ththe =e ==> => opoppoposising ng rorotattatioion.n. $xpla

$xplanationnation.. The =The ==> is t=> is the amphe ampereAturnereAturns of ths of the armatue armature2 prore2 producinducing a magg a magnetic finetic field ineld in the armature2 which opposes the main field and causes it to distort %in direction of motion of the armature2 which opposes the main field and causes it to distort %in direction of motion of the armature&.

the armature&. Q

Quueessttiioon n NNuummbbeerr.. 8855.. ! ! sshhuunnt t mmoottoorr.. 

ppttiioon n !!.. iis s ccoonnssttaannt st sppeeeedd.. 

ppttiioon n "".. hhaas s hhiiggh h ssttaartrtiinng g ttoorr::uuee.. p

ptition on #.#. gigiveves cs cononststanant tt toror:u:ue we witith vh varariaiatitionons is in sn spepeeded.. #o

#orrrrecect t !!nsnswewer ir is.s. is cois consnstatant nt spspeeeed.d. $xpla

$xplanationnation.. @# Dhu@# Dhunt motnt motors are Ccoors are Cconstannstant speedt speedC motorsC motors2 but st2 but starting tarting tor:ue ior:ue is smalls small.. Qu

Quesestition on NuNumbmberer.. 89..89 3n 3n a @a @# # shshununt mt mototoror2 2 if if ththe fe fieield ld reresisiststanance ce is is inincrcreaeasesed wd whahatt happens to the back $=>,.

happens to the back $=>,. 

ppttiioon n !!.. ddeeccrreeaasseess.. 

ppttiioon n "".. rreemmaaiinns s tthhe e ssaammee.. 

ppttiioon n ##.. iinnccrreeaasseess.. #o

#orrrrecect t !!nsnswewer r isis.. ddececrereasaseses.. $xpla

$xplanationnation.. The baThe back $=> ck $=> decreasdecreases wites with an inh an increase icrease in the fin the field reseld resistanistance. Thce. The armatue armaturere current would increase and the motor speed would increase.

(20)

Qu

Quesestition on NuNummbberer.. 550.0. TTo o inincrcreaease se ththe ve vololtatagge oe oututpput ut oof a gf a genenereratatoor yr you ou cacan.n. 

ppttiioon n !!.. ddeeccrreeaasse se sppeeeedd.. 

ppttiioon n "".. 33t t iis s nnoot t ssppeeeed d ddeeppeennddanantt.. 

ppttiioon n ##.. iinnccrreeaasse e ssppeeeedd.. #o

#orrrrecect !t !nsnswewer isr is.. inincrcreaeasse spe speeeedd.. $xpla

$xplanationnation.. 3ncreas3ncreasing ting the spehe speed maked makes the aes the armaturrmature cut the cut the magne magnetic fieletic field fastd faster2er2 inducing a greater voltage.

inducing a greater voltage. Q

Quueessttiioon n NNuummbbeerr.. 5511.. eenneerraattoor r vvoollttaagge e iiss.. p

ptition on !!.. ddepepenendadannt t on on sspepeed ed of of rorotatatitioon.n. p

ptition on "".. inindedepependndenent ot of sf sppeeeed d of of rorotatatitioonn.. p

ptition on ##.. nnot ot dedeppenenddanant ot on sn spepeed ed oof rf rootatatitioon.n. #o

#orrerrect ct !!nsnswewer isr is.. depedependndanant ot on sn spepeed ed of of rorotattatioion.n. $xpla

$xplanationnation.. The fasThe faster the ter the generagenerator turtor turns2 thns2 the more ve more voltagoltage it proe it producesduces. "esi. "esides2des2 C3ndependentC and Cnot dependantC mean the same thing.

C3ndependentC and Cnot dependantC mean the same thing. Qu

Quesestition on NuNummbberer.. 55'.'. TThhe oe oututpput ut frfrom om a a gegeneneraratotor r to to a a cocommmumutatatotor r isis..  ppttiioon n !!.. ppuullsseed d @@##..  ppttiioon n "".. @@##..  ppttiioon n ##.. !!##.. #

#oorrrreecct !t !nnsswweer ir iss.. !!##.. $xpla

$xplanationnation.. utpuutput of at of all genll generatorerators %bes %before thfore the come commutatomutator& is r& is !#!#.. Qu

Quesestition on NuNummbberer.. 55/./. ((hahat it is ts thhe me maiain dn disisadadvvanantatage ge of of a sa statartrter er ggenenereratatoror,.,. 

ppttiioon n !!.. ))eeaavvieier r tthhaan n lliikke fe foor r lliikke.e. p

ptition on "".. ((iill ll nnot ot susupppply ly oouutptpuut at at lt loow rw rpmpm.. p

ptition on ##.. ##an an ononly ly be be uusesed od on pn pisistoton en engnginineses.. #o

#orrerrect ct !!nsnswewer isr is.. (ill n(ill not ot susupppply ly ououtptput aut at lot low rpw rpm.m. $xpla

$xplanationnation.. !t lo!t low 7E=w 7E=2 sta2 starterAgrterAgeneratoenerator is r is still still in moin motor cotor configunfigurationration.. Q

Quuesesttiioon Nn Nuummbberer.. 55--.. ""aacckkA$A$==> i> is ts thhe ge grreeatatesest wt whheen a n a mmoototor ir iss.. 

ppttiioon n !!.. aat ot oppeerraattiinng sg sppeeeedd.. 

ppttiioon n "".. uunnddeer r hheeaavvy y llooaadd.. 

ppttiioon #n #.. JJuusst st sttaarrttiinng tg to ro roottaattee.. #o

#orrrrecect t !!nsnswewer ir is.s. at at opopereratatining sg spepeeded.. $xp

$xplanalanatiotion.n. "ac"ack $=> is grk $=> is greateeatest whest when moton motor is at high sr is at high speepeed.d. Qu

Quesestition on NuNumbmberer.. 5*5*.. (h(hen en a a cocondnducuctotor cr cararryryining g a a cucurrrrenent t anand d plplacaced ed in in a ma magagnenetiticc field it experiences.

field it experiences. 

ppttiioon !n !.. aan en elleeccttrroossttaattiic fc foorrccee.. 

ppttiioon n "".. aan n eelleeccttrorommagagnneettiic c ffoorrccee.. 