77 TOP Electric Traction - Electrical Engineering Multiple Choice Questions and Answers _ MCQs Preparation for Engineering Competitive Exams

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77TOPElectricTractionElectricalEngineeringMultiplechoiceQuestionsandAnswersLatestElectricTractionQuestionsandAnswersList

1.Whichofthefollowingisanadvantageofelectrictractionoverothermethodsoftraction?(a)Fasteracceleration(b)Nopollutionproblems(c)Betterbrakingaction(d)AlloftheaboveAns:a

2.WhichofthefollowingisthevoltageforsinglephaseA.C.system?(a)22V(b)440V(c)5kV(d)15kV(e)NoneoftheaboveAns:a

3.Longdistancerailwaysusewhichofthefollowing?(a)200VD.C.(b)25kVsinglephaseA.C.(c)25kVtwophaseA.C.(d)25kVthreephaseA.C.Ans:b

4.Thespeedofalocomotiveiscontrolledby(a)flywheel(b)gearbox(c)applyingbrakes11.(d)regulatingsteamflowtoengineAns:

5.MaintractionsystemsusedinIndiaare,thoseusing(a)electriclocomotives(b)dieselenginelocomotives(c)steamenginelocomotives(d)dieselelectriclocomotives(e)alloftheaboveAns:e

6,inIndiadiesellocomotivesaremanufacturedat(a)Ajmer(b)Varanasi(c)Bangalore(d)JamalpurAns:b

7.Fordiesellocomotivestherangeofhorsepoweris(a)50to200(b)500to1000(c)1500to2500(d)3000to5000Ans:c

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8._______locomotivehasthehighestoperationalavailability.(a)Electric(b)Diesel(c)SteamAns:a

9.Thehorsepowerofsteamlocomotivesis(a)upto1500(b)1500to2000(c)2000to3000(d)3000to4000Ans:a

10.Theoverallefficiencyofsteamlocomotiveisaround(a)5to10percent(b)15to20percent(c)25to35percent(d)35to45percentAns:a

11.Intramwayswhichofthefollowingmotorsisused?(a)D.C.shuntmotor(b)D.C.seriesmotor(c)A.C.threephasemotor(d)AC.singlephasecapacitorstartmotorAns:b

12.Inasteamlocomotiveelectricpowerisprovidedthrough(a)overheadwire(b)batterysystem(c)smallturbogenerator(d)dieselenginegeneratorAns:c

13.Whichofthefollowingdrivesissuitableformineswhereexplosivegasexists?(a)Steamengine(b)Dieselengine(c)Batterylocomotive(d)AnyoftheaboveAns:c

14.Incaseoflocomotivesthetractivepowerisprovidedby(a)singlecylinderdoubleactingsteamengine(b)doublecylinder,singleactingsteamengine(c)doublecylinder,doubleactingsteamengine(d)singlestagesteamturbineAns:c

15.Overloadcapacityofdieselenginesisusuallyrestrictedto(a)2percent(b)10percent(c)20percent(d)40percentAns:a

16.Incaseofsteamenginesthesteampressureis(a)1to4kgf/cm2(b)5to8kgf/cm2(c)10to15kgf/cm2(d)25to35kgf/cm2Ans:c

17..Thesteamengineprovidedonsteamlocomotivesis(a)singleactingcondensingtype(b)singleactingnoncondensingtype(e)doubleactingcondensingtype(d)doubleactingnoncondensingtypeAns:b

18.ElectriclocomotivesinIndiaaremanufacturedat(a)Jamalpur(b)Bangalore(c)Chittranjan(d)GorakhpurAns:c

19.Thewheelsofatrain,engineaswellasbogies,areslightlytaperedto(a)reducefriction(b)increasefriction(c)facilitatebraking

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(d)facilitateintakingturnsAns:d

20.Automaticsignallingisusedforwhichofthefollowingtrains?(a)Mailandexpresstrains(b)Superfasttrains(c)SuburbanandUrbanelectrictrains(d)AlltrainsAns:b

21.Theefficiencyofdiesellocomotivesisnearly(a)20to25percent(b)30to40percent(c)45to55percent(d)60to70percentAns:a

22.Thespeedofasuperfasttrainis(a)60kmph(b)75kmph(c)100kmph(d)morethan100kmphAns:d

23.Thenumberofpassengercoachesthatcanbeattachedtoadieselenginelocomotiveonbroadgaugeisusuallyrestrictedto(a)5(b)10(c)14(d)17Ans:b

24.Whichofthefollowingstatecapitalsisnotonbroadgaugetrack?(a)Lucknow(b)Bhopal(c)Jaipur(d)ChandigarhAns:c

25.Whichofthefollowingistheadvantageofelectricbraking?(a)Itavoidswearoftrack(b)Motorcontinuestoremainloadedduringbraking(c)Itisinstantaneous(d)MoreheatisgeneratedduringbrakingAns:a

Whichofthefollowingbrakingsystemsonthelocomotivesiscostly?(a)Regenerativebrakingonelectriclocomotives(b)Vacuumbrakingondiesellocomotives(c)Vacuumbrakingonsteamlocomotives(d)AllbrakingsystemsareequallycostlyAns:a

27.Tractiveeffortisrequiredto(a)overcomethegravitycomponentoftrainmass(b)overcomefriction,windageandcurveresistance(c)acceleratethetrainmass(d)doalloftheaboveAns:d

28.ForgivenmaximumaxleloadtractiveeffortsofAC.locomotivewillbe(a)lessthanthatofD.C.locomotive(b)morethanthatofD.C.locomotive(c)equaltothatofD.C.locomotive(d)noneoftheaboveAns:b

29.Coefficientofadhesionreducesduetothepresenceofwhichofthefollowing?(a)Sandonrails(b)Dewonrails(c)Oilontherails(d)both(b)and(c)Ans:d

30.Duetowhichofthefollowingcoefficientofadhesionimproves?(a)Rustontherails(b)Dustontherails(c)Sandontherails(d)AlloftheaboveAns:d

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31.Quadrilateralspeedtimecurvepertainstowhichofthefollowingservices?(a)Mainlineservice(b)Urbanservice(c)Suburbanservice(d)UrbanandsuburbanserviceAns:d

32.Whichofthefollowingisthedisadvantageofelectrictractionoverothersystemsoftraction?(a)Corrosionproblemsintheundergroundpipework(b)Shorttimepowerfailureinterruptstrafficforhours(c)Highcapitaloutlayinfixedinstallationsbesideroutelimitation(d)Interferencewithcommunicationlines(c)AlloftheaboveAns:c

33.Coefficientofadhesionis(a)highincaseofD.C.tractionthaninthecaseofAC.traction(b)lowincaseofD.C.tractionthaninthecaseofAC.traction(c)equalinbothAC.andD.C.traction(d)anyoftheaboveAns:b

34.Speedtimecurveofmainlineservicediffersfromthoseofurbanandsuburbanservicesonfollowingaccount(a)ithaslongerfreerunningperiod(b)ithaslongercoastingperiod(c)acceleratingandbrakingperiodsarecomparativelysmaller(d)alloftheaboveAns:d

35.Therateofaccelerationonsuburbanorurbanservicesisrestrictedbytheconsiderationof(a)Enginepower(b)Trackcurves(c)PassengerDiscomfort(d)TracksizeAns:c

36.Thespecificenergyconsumptionofatraindependsonwhichofthefollowing?(a)Accelerationandretardation(b)Gradient(c)Distancecovered(d)AlloftheaboveAns:d

37.Thefrictionatthetrackisproportionalto(a)1/speed(b)l/(speed)2(c)speed(d)noneoftheaboveAns:c

38.Theairresistancetothemovementofthetrainisproportionalto(a)speed(b)(speed)(c)(speed)(d)1/speedAns:b

39.Thenormalvalueofadhesionfrictionis(a)0.12(b)0.25(c)0.40(d)0.75Ans:b

40.Thepulsatingtorqueexertedbysteamlocomotivescauseswhichofthefollowing?(a)Joltingandskidding(b)Hammerblow(c)Pitching(d)AlloftheaboveAns:a

41.Whichofthefollowingbrakingsystemsisusedonsteamlocomotives?(a)Hydraulicsystem(b)Pneumaticsystem(c)Vacuumsystem(d)NoneoftheaboveAns:c

42.Vacuumiscreatedbywhichofthefollowing?(a)Vacuumpump(b)Ejector



(c)Anyoftheabove(d)NoneoftheaboveAns:c

43.Theresistanceencounteredbyatraininmotionisonaccountof(a)resistanceofferedbyair(b)frictionatthetrack(c)frictionatvariouspartsoftherollingstock(d)alloftheaboveAns:d

44.Batteryoperatedtrucksareusedin(a)steelmills(b)powerstations(c)narrowgaugetraction(d)factoriesformaterialtransportationAns:d

45methodcanbringthelocomotivetodeadstop.(a)Pluggingbraking(b)Rheostaticbraking(c)Regenerativebraking(d)NoneoftheaboveAns:a

46.Thevalueofcoefficientofadhesionwillbehighwhenrailsare(a)greased(b)wet(c)sprayedwithoil(d)cleanedwithsandAns:d

47.ThevoltageusedforsuburbantrainsinD.C.systemisusually(a)12V(b)24V(c)220V(d)600to750VAns:d

48.Forthreephaseinductionmotorswhichofthefollowingistheleastefficientmethodofspeedcontrol?(a)Cascadecontrol(b)Polechanging(c)Rheostatcontrol(d)CombinationofcascadeandpolechangingAns:c

49.Specificenergyconsumptionbecomes(a)moreonsteepergradient(b)morewithhightrainresistance(c)lessifdistancebetweenstopsismore(d)alloftheaboveAns:d

50.Inmainlineserviceascomparedtourbanandsuburbanservice(a)distancebetweenthestopsismore(b)maximumspeedreachedishigh(c)accelerationandretardationratesarelow(d)alloftheaboveAns:d

51.Locomotivehavingmonomotorbogies(a)hasbettercoefficientofadhesion(b)aresuitedbothforpassangeraswellasfreightservice(c)hasbetterridingqualitiesduetothereductionoflateralforces(d)hasallabovequalitiesAns:d

52.Seriesmotorisnotsuitedfortractiondutyduetowhichofthefollowingaccount?(a)Lesscurrentdrainontheheavyloadtorque(b)Currentsurgesaftertemporaryswitchingoffsupply(c)Selfrelievingproperty(d)CommutatingpropertyatheavyloadAns:b

53.Whenabogienegotiatesacurve,reductioninadhesionoccursresultinginsliding.Thusslidingisacutewhen(a)wheelbaseofaxlesismore(b)degreeofcurvatureismore(c)both(a)and(b)(d)noneoftheaboveAns:c



54.Energyconsumptioninpropellingthetrainisrequiredforwhichofthefollowing?(a)Workagainsttheresistancetomotion(b)Workagainstgravitywhilemovingupthegradient(c)Acceleration(d)AlloftheaboveAns:d

55.Anidealtractionsystemshouldhave(a)easyspeedcontrol(b)highstartingtractiveeffort(c)equipmentcapableofwithstandinglargetemporaryloads(d)alloftheaboveAns:d

56havemaximumunbalancedforces(a)Dieselshunters(b)Steamlocomotives(c)Electriclocomotives(d)DiesellocomotivesAns:b

57.Specificenergyconsumptionisaffectedbywhichofthefollowingfactors?(a)Retardationandaccelerationvalues(b)Gradient(c)Distancebetweenstops(d)AlloftheaboveAns:d

58.Incaseof________freerunningandcoastingperiodsaregenerallylong.(a)mainlineservice(b)urbanservice(c)suburbanservice(d)alloftheaboveAns:a

59.Overheadlinesforpowersupplytotramcarsareataminimumheightof(a)3m(b)6m(c)10m(d)15mAns:c

60.Thereturncircuitfortramcarsisthrough(a)neutralwire(b)rails(c)cables(d)commonearthingAns:b

61.Specificenergyconsumptionisleastin_______service.(a)mainline(b)urban(c)suburbanAns:a

62.Locomotiveswithmonometerbogieshave(a)unevendistributionoftractiveeffect(b)suitabilityforpassangeraswellasfreightservice(c)lotofskidding(d)lowcoefficientofadhesionAns:b

63_______wasthefirstcityinIndiatoadoptelectrictraction.(a)Delhi(b)Madras(c)Calcutta(d)BombayAns:d

64_______frequencyisnotcommoninlowfrequencytractionsystem(a)40Hz(b)25Hz(c)16HzAns:a

65.For25kVsinglephasesystempowersupplyfrequencyis(a)60Hz(b)50Hz(c)25Hz(d)16HzAns:b



66.Powerforlightinginpassangercoach,inalongdistanceelectrictrain,isprovided(a)directlythroughoverheadelectricline(b)throughindividualgeneratorofbogieandbatteries(c)throughrails(d)throughlocomotiveAns:b

67.InIndia,electrificationofrailwaytrackwasdoneforthefirsttimeinwhichofthefollowingyears?(a)18201825(b)18801885(c)19251932(d)19471954Ans:c

68.Suritransmissionis(a)electricalpneumatic(b)mechanicalelectrical(c)hydromechanical(d)hydropneumaticAns:c

69.Incaseofasteamengineanaveragecoalconsumptionperkmisnearly(a)150to175kg(b)100to120kg(c)60to80kg(d)28to30kgAns:d

70.WhichofthefollowinghappensinKandosystem?(a)ThreephaseA.C.isconvertedintoD.C.(b)SinglephaseA.C.isconvertedintoD.C.(c)Singlephasesupplyisconvertedintothreephasesystem(d)NoneoftheaboveAns:c

71.Forwhichofthefollowinglocomotivesthemaintenancerequirementsaretheleast?(a)Steamlocomotives(b)Diesellocomotives(c)Electriclocomotives(d)EqualinalloftheaboveAns:b

72.Whichofthefollowingmethodsisusedtocontrolspeedof25kV,50Hzsinglephasetraction?(a)Reducedcurrentmethod(b)Tapchangingcontroloftransformer(c)Seriesparalleloperationofmotors(d)AlloftheaboveAns:b

73.Ifthecoefficientofadhesionondryrailsis0.26,whichofthefollowingcouldbethevalueforwetrails?(a)0.3(b)0.26(c)0.225(d)0.16Ans:d

74watthourspertonnekmisusuallythespecificenergyconsumptionforsuburbanservices.(a)1520(b)5075(c)120150(d)160200Ans:b

75.Thebrakingretardationisusuallyintherange(a)0.15to0.30kmphps(b)0.30to0.6kmphps(c)0.6to2.4kmphps(d)3to5kmphps(e)10to15kmphpsAns:d

76.Therateofaccelerationonsuburbanorurbanserviceisintherange(a)0.2to0.5kmphps(b)1.6to4.0kmphps(c)5to10kmphps(d)15to25kmphpsAns:b

77.Thecoastingretardationisaround(a)0.16kmphps



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(b)1.6kmphps(c)16kmphps(d)40kmphpsAns:a

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77 TOP Electric Traction - Electrical Engineering Multiple Choice Questions and Answers _ MCQs Preparation for Engineering Competitive Exams