102 TOP Transmission and Distribution

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HomeTransmissionandDistributionQuizQuestionsandAnswers102TOPTransmissionandDistributionElectricalEngineeringMultipleChoiceQuestionsandAnswers

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102TOPTransmissionandDistributionElectricalEngineeringMultipleChoiceQuestionsandAnswersLatestTransmissionandDistributionQuestionsandAnswersList

1.Bywhichofthefollowingsystemselectricpowermaybetransmitted?(a) Overheadsystem(b) Undergroundsystem(c) Both(a)and(b)(d) NoneoftheaboveAns:c

2 aretheconductors,whichconnecttheconsumer'sterminalstothedistribution(a)Distributors(b)Servicemains(c) Feeders(d) NoneoftheaboveAns:b

3. Theundergroundsystemcannotbeoperatedabove(a)440V(b)11kV(c)33kV(d)66kVAns:d

4. Overheadsystemcanbedesignedforoperationupto(a)11kV(b)33kV(c)66kV(d)400kVAns:c

5. Ifvariablepartofannualcostonaccountofinterestanddepreciationonthecapitaloutlayisequaltotheannualcostofelectricalenergywastedintheconductors,thetotalannualcostwillbeminimumandthecorrespondingsizeofconductorwillbemosteconomical.Thisstatementisknownas(a)Kelvin'slaw(b)Ohm'slaw(c)Kirchhoffslaw(d)Faraday'slaw(e)noneoftheaboveAns:a

6. Thewoodenpoleswellimpregnatedwithcreositeoiloranypreservativecompoundhavelife(a) from2to5years(b) 10to15years(c) 25to30years(d) 60to70yearsAns:c

7. Whichofthefollowingmaterialsisnotusedfortransmissionanddistributionofelectricalpower?(a)Copper(b)Aluminium(c)Steel

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(d)TungstenAns:d

8. Galvanisedsteelwireisgenerallyusedas(a)staywire(b)earthwire(c) structuralcomponents(d) alloftheaboveAns:d

9. TheusualspanswithR.C.C.polesare(a) 4050meters(b) 60100meters(c) 80100meters(d) 300500metersAns:c

10. Thecoronaisconsiderablyaffectedbywhichofthefollowing?(a)Sizeoftheconductor(b)Shapeoftheconductor(c)Surfaceconditionoftheconductor(d)AlloftheaboveAns:d

11. Whichofthefollowingaretheconstantsofthetransmissionlines?(a)Resistance(b)Inductance(c)Capacitance(d)AlloftheaboveAns:d

12. 310kmlineisconsideredas(a)alongline(b)amediumline(c)ashortline(d)anyoftheaboveAns:a

13. Thephenomenonqfriseinvoltageatthereceivingendoftheopencircuitedorlightlyloadedlineiscalledthe(a)Seebackeffect(b)Ferrantieffect(c)Ramaneffect(d)noneoftheaboveAns:b

14. Thesquarerootoftheratiooflineimpedanceandshuntadmittanceiscalledthe(a)surgeimpedanceoftheline(b)conductanceoftheline(c)regulationoftheline(d)noneoftheaboveAns:a

15. Whichofthefollowingisthedemeritofa'constantvoltagetransmissionsystem'?(a) Increaseofshortcircuitcurrentofthesystem(b) Availabilityofsteadyvoltageatallloadsatthelineterminals(c) Possibilityofbetterprotectionforthelineduetopossibleuseofhigherterminalreactants(d)Improvementofpowerfactorattimesofmoderateandheavyloads(e)PossibilityofcarryingincreasedpowerforagivenconductorsizeincaseoflongdistanceheavypowertransmissionAns:a

16. Lowvoltagecablesaremeantforuseupto(a)l.lkV(b)3.3kV(c)6.6kV(d)llkVAns:e

17. Theoperatingvoltageofhighvoltagecablesisupto(a)l.lkV(b)3.3kV(c)6.6kV(d)llkVAns:d

18. Theoperatingvoltageofsupertensioncablesisupto(a)3.3kV(b)6.6kV(c)11kV(d)33kVAns:d

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19. Theoperatingvoltageofextrahightensioncablesisupto(a)6.6kV(b)11kV(c)33kV(d)66kV(e)132kVAns:d

20. Whichofthefollowingmethodsisusedforlayingofundergroundcables?(a)Directlaying(b)Drawinsystem(c)Solidsystem(d)AlloftheaboveAns:d

21. Whichofthefollowingisthesourceofheatgenerationinthecables?(a)Dielectriclossesincableinsulation(b)lossesintheconductor(c) Lossesinthemetallicsheathingsandarmourings(d)AlloftheaboveAns:

22. Duetowhichofthefollowingreasonsthecablesshouldnotbeoperatedtoohot?(a) Theoilmaylooseitsviscosityanditmaystartdrawingofffromhigherlevels(b) Expansionoftheoilmaycausethesheathtoburst(c)Unequalexpansionmaycreatevoidsintheinsulationwhichwillleadtoionization(d) Thethermalinstabilitymayriseduetotherapidincreaseofdielectriclosseswithtemperature(e) AlloftheaboveAns:e

23. WhichofthefollowingD.C.distributionsystemisthesimplestandlowestinfirstcost?(a)Radialsystem(b)Ringsystem(c)Interconnectedsystem(d)NoneoftheaboveAns:a

24. Aboosterisa(a) serieswoundgenerator(b) shuntwoundgenerator(c) synchronousgenerator(d)noneoftheaboveAns:a

25. Besidesamethodoftrialanderror,whichofthefollowingmethodsisemployedforsolutionofnetworkproblemsininterconnectedsystem?(a) Circulatingcurrentmethod(b) Thevenin'stheorem(c)Superpositionofcurrents(d)DirectapplicationofKirehhoffslaws(e) AlloftheaboveAns:e

26. Whichofthefollowingfaultsismostlikelytooccurincables?(a)Crossorshortcircuitfault(b)Opencircuitfault(c)Breakdownofcableinsulation(d)AlloftheaboveAns:

27. Thecauseofdamagetotheleadsheathofacableis(a) crystallisationoftheleadthroughvibration(b) chemicalactionontheleadwhenburiedintheearth(c) mechanicaldamage(d) alloftheaboveAns:

28. Thevoltageofthesinglephasesupplytoresidentialconsumersis(a)110V(b)210V(c)230V(d)400VAns:c

29. MostofthehighvoltagetransmissionlinesinIndiaare(a)underground(b)overhead(c)eitheroftheabove(d)noneoftheaboveAns:b

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30. Thedistributorsforresidentialareasare(a) singlephase(b) threephasethreewire(c)threephasefourwire(d) noneoftheaboveAns:c

31. Theconductorsoftheoverheadlinesare(a)solid(b)stranded(c)bothsolidandstranded(d)noneoftheaboveAns:

32. Highvoltagetransmissionlinesuse(a)suspensioninsulators(b)pininsulators(c)both(a)and(b)(d)noneoftheaboveAns:a

33. Multicorecablesgenerallyuse(a)squareconductors(b)circularconductors(c) rectangularconductors(d) sectorshapedconductors(e) noneoftheaboveAns:d

34. DistributionlinesinIndiagenerallyuse(a)woodenpoles(b)R.C.C.poles(c)steeltowers(d)noneoftheaboveAns:b

35. Thematerialcommonlyusedforinsulationinhighvoltagecablesis(a)lead(b)paper(c)rubber(d)noneoftheaboveAns:b

36. Theloadsondistributorssystemsaregenerally(a)balanced(b)unbalanced(c)eitheroftheabove(d)noneoftheaboveAns:b

37. Thepowerfactorofindustrialloadsisgenerally(a)unity(b)lagging(c)leading(d)zeroAns:b

38. Overheadlinesgenerallyuse(a) copperconductors(b) allaluminiumconductors(c) A.C.S.R.conductors(d) noneoftheseAns:c

39. Intransmissionlinesthecrossarmsaremadeof(a)copper(b)wood(c)R.C.C.(d)steelAns:d

40. Thematerialgenerallyusedforarmourofhighvoltagecablesis(a)aluminium(b)steel(c)brass(d)copperAns:b

41. Transmissionlineinsulatorsaremadeof(a)glass(b)porcelain



(c)iron(d)P.V.C.Ans:

42. Thematerialcommonlyusedforsheathsofundergroundcablesis(a)lead(b)rubber(c)copper(d)ironAns:a

43. Theminimumclearancebetweenthegroundanda220kVlineisabout(a)4.3m(b)5.5m(c)7.0m(d)10.5mAns:c

44. Thespacingbetweenphaseconductorsofa220kVlineisapproximatelyequalto(a)2m(b)3.5m(c)6m(d)8.5mAns:c

45. Largeindustrialconsumersaresuppliedelectricalenergyat(a)400V(b)11kV(c)66kV(d)400kVAns:c

46. InaD.C.3wiredistributionsystem,balancerfieldsarecrossconnectedinorderto(a) boostthegeneratedvoltage(b) balanceloadsonbothsidesoftheneutral(c) makebothmachine^runasunloadedmotors(d)equalizevoltagesonthepositiveandnegativeoutersAns:

47. InaD.C.3wiredistributorusingbalancersandhavingunequalloadsonthetwosides(a)bothbalancersrunasgenerators(b)bothbalancersrunasmotors(c)balancerconnectedtolightlyloadedsiderunsasamotor(d)balancerconnectedtoheavilyloadedsiderunsasamotorAns:

48. Transmittedpowerremainingthesame,ifsupplyvoltageofaD.C.2wirefeederisincreased100percent,savingincopperis(a)25percent(b)50percent(c)75percent(d)100percentAns:b

49. AuniformlyloadedD.C.distributorisfedatbothendswithequalvoltages.Ascomparedtoasimilardistributorfedatoneendonly,thedropatthemiddlepointis(a)onefourth(b)onethird(c)onehalf(d)twice(e)noneoftheaboveAns:a

50. Ascomparedtoa2wireD.C.distributor,a3wiredistributorwithsamemaximumvoltagetoearthusesonly(a)31.25percentofcopper(b)33.3percentofcopper(c)66.7percentofcopper(d)125percentofcopperAns:a

51. Whichofthefollowingisusuallynotthegeneratingvoltage?(a)6.6kV(b)8.8kV(c)11kV(d)13.2kVAns:b

52. Foranoverheadline,thesurgeimpedanceistakenas(a)2030ohms(b)7080ohms(c)100200ohms



(d)5001000ohms(e)noneoftheaboveAns:c

53. Thepresenceofozoneduetocoronaisharmfulbecauseit(a)reducespowerfactor(b)corrodesthematerial(c) givesodour(d) transferenergytotheground(e) noneoftheaboveAns:b

54. Afeeder,inatransmissionsystem,feedspowerto(a)distributors(b)generatingstations(c) servicemains(d) alloftheaboveAns:a

55. Thepowertransmittedwillbemaximumwhen(a) coronalossesareminimum(b) reactanceishigh(c) sendingendvoltageismore(d) receivingendvoltageismoreAns:c

56. A3phase4wiresystemiscommonlyusedon(a) primarytransmission(b) secondarytransmission(c) primarydistribution(d) secondarydistributionAns:d

57. Whichofthefollowingmaterialsisusedforoverheadtransmissionlines?(a) Steelcoredaluminium(b) Galvanisedsteel(c) Cadmiumcopper(d) AnyoftheaboveAns:d

58. Whichofthefollowingisnotaconstituentformakingporcelaininsulators?(a)Quartz(b)Kaolin(c)Felspar(d)SilicaAns:d

59. Thereisagreaterpossibilityofoccurenceofcoronaduring(a)dryweather(b)winter(c)summerheat(d)humidweather(e)noneoftheaboveAns:d

60. Whichofthefollowingrelaysisusedonlongtransmissionlines?(a)Impedancerelay(b)Mho'srelay(c)Reactancerelay(d)NoneoftheaboveAns:b

61. Thesteelusedinsteelcoredconductorsisusually(a)alloysteel(b)stainlesssteel(c)mildsteel(d)highspeedsteel(e)alloftheaboveAns:c

62. Whichofthefollowingdistributionsystemsismorereliable?(a)Radialsystem(b)Treesystem(c)Ringmainsystem(d)AllareequallyreliableAns:c

63. Whichofthefollowingcharacteristicsshouldthelinesupportsfortransmissionlinespossess?(a) Lowcost(b) Highmechanicalstrength(c) Longerlife



(d)AlloftheaboveAns:d

64. TransmissionvoltageofllkVisnormallyusedfordistancesupto(a)2025km(b)4050km(c)6070km(d)80100kmAns:a

65. Whichofthefollowingregulationsisconsideredbest?(a)50%(b)20%(c)10%(d)2%Ans:d

66. Skineffectisproportionalto(a) (conductordiameter)(b) (conductordiameter)(c) (conductordiameter)(d) (conductordiameter)(e) noneoftheaboveAns:c

67. Aconductor,duetosagbetweentwosupports,takestheformof(a)semicircle(b)triangle(c)ellipse(d)catenaryAns:d

68. InAC.S.R.conductors,theinsulationbetweenaluminiumandsteelconductorsis(a)insulin(b)bitumen(c) varnish(d) noinsulationisrequiredAns:d

69. Whichofthefollowingbusbarschemeshasthelowestcost?(a)Ringbusbarscheme(b)Singlebusbarscheme(c) Breakerandahalfscheme(d) MainandtransferschemeAns:b

70. Owingtoskineffect(a)currentflowsthroughthehalfcrosssectionoftheconductor(b)portionoftheconductornearthesurfacecarriesmorecurrentandcoreoftheconductorcarrieslesscurrent(c)portionoftheconductornearthesurfacecarrieslesscurrentandcoreoftheconductorcarriesmorecurrent(d)anyoftheabove(e)noneoftheaboveAns:b

71. Bywhichofthefollowingmethodsstringefficiencycanbeimproved?(a) Usingaguardring(b) Gradingtheinsulator(c)Usinglongcrossarm(d) Anyoftheabove(e) NoneoftheaboveAns:d

72. Inaluminiumconductors,steelcoreisprovidedto(a) compensateforskineffect(b) neutraliseproximityeffect(c) reducelineinductance(d) increasethetensilestrengthAns:d

73. Bywhichofthefollowingabusbarisrated?(a) Currentonly(b) Currentandvoltage(c) Current,voltageandfrequency(d) Current,voltage,frequencyandshorttimecurrentAns:d

74. Acircuitisdisconnectedbyisolatorswhen(a)lineisenergized(b)thereisnocurrentintheline(c) lineisonfullload(d) circuitbreakerisnotopen



Ans:b

75. Forwhichofthefollowingequipmentcurrentratingisnotnecessary?(a)Circuitbreakers(b)Isolators(c) Loadbreakswitch(d) CircuitbreakersandloadbreakswitchesAns:b

76. Inasubstationthefollowingequipmentisnotinstalled(a)exciters(b)seriescapacitors(c)shuntreactors(d)voltatretransformersAns:a

77. jCoronausuallyoccurswhentheelectrostaticstressinairaroundtheconductorexceeds(a) 6.6kV(r.m.s.value)/cm(b) 11kV(r.m.s.value)/cm(c) 22kV(maximumvalue)/cm(d) 30kV(maximumvalue)/cmAns:d

78. Thevoltagedrop,forconstantvoltagetransmissioniscompensatedbyinstalling(a)inductors(b)capacitors(c)synchronousmotors(d)allofabove(e)noneoftheaboveAns:c

79. Theuseofstraintypeinsulatorsismadewheretheconductorsare(a) deadended(b) atintermediateanchortowers(c) anyoftheabove(d) noneoftheaboveAns:c

80. Thecurrentdrawnbythelineduetocoronalossesis(a)nonsinusoidal(b)sinusoidal(c)triangular(d)squareAns:a

81. Pintypeinsulatorsaregenerallynotusedforvoltagesbeyond(a)1kV(b)11kV(c)22kV(d)33kVAns:d

82. Aluminiumhasaspecificgravityof(a)1.5(b)2.7(c)4.2(d)7.8Ans:b

83. Fortransmissionofpoweroveradistanceof200km,thetransmissionvoltageshouldbe(a)132kV(b)66kV(c)33kV(d)11kVAns:a

84. Foraluminium,ascomparedtocopper,allthefollowingfactorshavehighervaluesexcept(a)specificvolume(6)electricalconductivity(c)coefficientoflinearexpansion(d)resistanceperunitlengthforsamecrosssectionAns:b

85. Whichofthefollowingequipment,forregulatingthevoltageindistributionfeeder,willbemosteconomical?(a)Staticcondenser(b) Synchronouscondenser(c) Tapchangingtransformer(d) BoostertransformerAns:d

86. Inatapchangingtransformer,thetappingsareprovidedon



(a) primarywinding(b) secondarywinding(c) highvoltagewinding(d) anyoftheaboveAns:b

87. Constantvoltagetransmissionentailsthefollowingdisadvantage(a) largeconductorareaisrequiredforsamepowertransmission(b) shortcircuitcurrentofthesystemisincreased(c) eitheroftheabove(d) noneoftheaboveAns:b

88. Onwhichofthefollowingfactorsskineffectdepends?(a) Frequencyofthecurrent(b) Sizeoftheconductor(c) Resistivityoftheconductormaterial(d) AlloftheaboveAns:d

89. Theeffectofcoronacanbedetectedby(a) presenceofozonedetectedbyodour(b) hissingsound(c) faintluminousglowofbluishcolour(d) alloftheaboveAns:d

90. Fortransmissionofpoweroveradistanceof500km,thetransmissionvoltageshouldbeintherange(a)150to220kV(b)100to120kV(c)60to100kV(d)20to50kVAns:a

91. Intheanalysisofwhichofthefollowinglinesshuntcapacitanceisneglected?(a) Shorttransmissionlines(b) Mediumtransmissionlines(c) Longtransmissionlines(d) MediumaswellaslongtransmissionlinesAns:a

92. Whentheinterconnectorbetweentwostationshaslargereactance(a)thetransferofpowerwilltakeplacewithvoltagefluctuationandnoise(b)thetransferofpowerwilltakeplacewithleastloss(c)thestationswillfalloutofstepbecauseoflargeangulardisplacementbetweenthestations(d)noneoftheaboveAns:c

93.Thefrequencyofvoltagegenerated,incaseofgenerators,canbeincreasedby(a)usingreactors(b)increasingtheload(c) adjustingthegovernor(d) reducingtheterminalvoltage(e) noneoftheaboveAns:c

94. Whenanalternatorconnectedtothebusbarisshutdownthebusbarvoltagewill(a)fall(b)rise(c)remainunchanged(d)noneoftheaboveAns:c

95. Theangulardisplacementbetweentwointerconnectedstationsismainlydueto(a) armaturereactanceofbothalternators(b) reactanceoftheinterconnector(c) synchronousreactanceofboththealternators(d) alloftheaboveAns:a

96. Electromechanicalvoltageregulatorsaregenerallyusedin(a)reactors(b)generators(c)transformers(d)alloftheaboveAns:b

97. SeriescapacitorsontransmissionlinesareoflittleusewhentheloadVARrequirementis(a) large(b)small(b) fluctuating



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(d)anyoftheaboveAns:b

98. Thevoltageregulationinmagneticamplifiertypevoltageregulatoriseffectedby(a) electromagneticinduction(b) varyingtheresistance(c) varyingthereactance(d) variabletransformerAns:c

99. Whenaconductorcarriesmorecurrentonthesurfaceascomparedtocore,itisdueto(a)permeabilityvariation(b)corona(c)skineffect(d)unsymmetricalfault(e)noneoftheaboveAns:c

100. Thefollowingsystemisnotgenerallyused(a)1phase3wire(b)1phase4wire(c)3phase3wire(d)3phase4wireAns:a

101. Theskineffectofaconductorwillreduceasthe(a)resistivityofconductormaterialincreases(b)permeabilityofconductormaterialincreases(c) diameterincreases(d) frequencyincreasesAns:a

102. Whenaliveconductorofpublicelectricsupplybreaksdownandtouchestheearthwhichofthefollowingwillhappen?(a) Currentwillflowtoearth(b) Supplyvoltagewilldrop(c) Supplyvoltagewillincrease(d) Nocurrentwillflowintheconductor(e) NoneoftheaboveAns:a

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