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100TOPElectricalEngineeringMaterialsElectricalEngineeringMultiplechoiceQuestionsandAnswersLatestElectricalEngineeringMaterialsQuestionsandAnswers

1.Theconverseofhardnessisknownas(a)malleability(b)toughness(c)softness(d)noneoftheaboveAns:c

2.Onwhichofthefollowingfactorsdoestheresistivityofamaterialdepend?(a)Resistanceoftheconductor(b)Areaoftheconductorsection(c)Lengthoftheconductor(d)AlloftheaboveAns:d

3.isanegativelychargedparticlepresentinanatom.(a)Proton(b)Neutron(c)Electron(d)NoneoftheaboveAns:c

4.Theformula____determinesthenumberofelectronsthatcanbeaccommodatedinanylevel.(a)2n2(6)4n2(c)2n3(d)4nsAns:a

5.Thetinyblockformedbythearrangementofasmallgroupofatomsiscalledthe(a)unitcell(b)spacelattice(c)either(a)or(b)(d)noneoftheaboveAns:a

6.Thecoordinationnumberofasimplecubicstructureis(a)2(b)4(c)6(d)8Ans:c

7.Thecovalentbondisformedby(a)transferofelectronsbetweenatoms(b)sharingofelectronsbetweenatoms(e)sharingofvariablenumberofelectronsbyavariablenumberofatoms(d)noneoftheaboveAns:b

8.Aperfectconductorhas

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(a)zeroconductivity(b)unityconductivity(c)infiniteconductivity(d)noneoftheaboveAns:c

9.Themetalhavingthelowesttemperaturecoefficientofresistanceis(a)gold(b)copper(c)aluminium(d)kanthalAns:a

10.Commonlyusedconductingmaterialsare(a)copper(b)aluminium(c)both(a)and(b)(d)copperandsilver(e)platinumandgoldAns:c

11.Whichofthefollowingmaterialsispreferredfortransmittingelectricalenergyoverlongdistance?(a)Copper(b)Aluminium(c)Steelreinforcedcopper(d)SteelreinforcedaluminiumAns:d

12.Thekineticenergyofaboundedelectronis(a)lessthanthatofunboundedelectron(6)greaterthanthatofunboundedelectron(c)equaltothatofunboundedelectron(d)infinite(e)noneoftheaboveAns:a

13.Ahighlyconductivematerialmusthave(a)highestconductivity(b)lowesttemperaturecoefficient(c)goodmechanicalstrength(d)goodcorrosionresistance(e)easysolderableanddrawablequality(f)alloftheaboveAns:f

14.Theconductivityofaconductorcanbeincreasedby(a)decreasingitstemperature(b)increasingitstemperature(c)decreasingitsvibration(d)increasingitsvibrationAns:a

15.Superconductivityisobservedfor(a)infraredfrequencies(b)d.c.andlowfrequency(c)a.c.andhighfrequency(d)frequencieshavingnoeffect(e)noneoftheaboveAns:b

16.Thesuperconductivityisdueto(a)thecrystalstructurehavingnoatomicvibrationat0K(b)allelectronsinteractinthesuperconductingstate(c)theelectronsjumpintonucleusat0K(d)noneoftheaboveAns:a

17.Thevalueofcriticalfieldbelowthetransitiontemperaturewill(a)increase(b)decrease(c)remainunchanged(d)anyoftheaboveAns:a

18.Inasuperconductorthevalueofcriticaldensitydependsupon(a)magneticfieldstrength(b)temperature(c)either(a)or(b)(d)both(a)and(b)Ans:d

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19.Superconductorsarebecomingpopularforusein(a)generatingverystrongmagneticfield(b)manufactureofbubblememories(c)generatingelectrostaticfield(d)generatingregionsfreefrommagneticfieldAns:a

20.Highresistivitymaterialsareusedin(a)precisioninstruments(6)heatingelements(c)motorstarters(d)incandescentlamps(e)alloftheaboveAns:e

21.Mercuryasanelectriccontactmaterialis(a)aliquid(b)ametal(c)ametalliquid(d)agasAns:c

22.AnH.R.C.fuseis(a)aceramicbodyhavingmetalandcaps(b)awireofplatinum(c)aheavycrosssectionofcopperoraluminium(d)aceramictubehavingcarbonrodinsideitAns:a

23.Whichofthefollowingresistivematerialshasthelowesttemperaturecoefficientofresistance?(a)Nichrome(b)Constantan(c)Kanthal(d)MolybdenumAns:a

24.ThecoilsofD.C.motorstarterarewoundwithwireof(a)copper(b)kanthal(c)manganin(d)nichromeAns:c

25.Theconductorshavetransportphenomenaofelectronsdueto(a)electricfield(b)magneticfield(c)electromagneticfield(d)noneoftheaboveAns:a

26.Thetransitiontemperatureofmercuryis(a)18.0K(6)9.22K(c)4.12K(d)1.14'KAns:c

27.Byincreasingimpuritycontentinthemetalalloytheresidualresistivityalways(a)decreases(b)increases(c)remainsconstant(d)becomestemperatureindependentAns:b

28.Thestructuresensitivepropertyofasuperconductoris(a)criticalmagneticfield(b)transitiontemperature(c)criticalcurrentdensity(d)noneoftheaboveAns:c

29.Attransitiontemperaturethevalueofcriticalfieldis(a)zero(6)negativerealvalue(c)positiverealvalue(d)complexvalueAns:a

30.Whichofthefollowingvarietyofcopperhasthebestconductivity?(a)Inductionhardenedcopper(b)Harddrawncopper

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(c)Pureannealedcopper(d)CoppercontainingtracesofsiliconAns:c

31.Constantancontains(a)silverandtin(b)copperandtungsten(c)tungstenandsilver(d)copperandnickelAns:d

32.Whichofthefollowingisthepoorestconductorofelectricity?(a)Carbon(b)Steel(c)Silver(d)AluminiumAns:a

33______haszerotemperaturecoefficientofresistance.(a)Aluminium(b)Carbon(c)Porcelain(d)ManganinAns:d

34.Piezoelectricmaterialsserveasasourceof_____.(a)resonantwaves(b)musicalwaves(c)microwaves(d)ultrasonicwavesAns:d

35.Inthermocoupleswhichofthefollowingpairsiscommonlyused?(a)Copperconstantan(b)Aluminiumtin(c)SilverGermansilver(d)IronsteelAns:a

36isviscoelastic.(a)Castiron(6)Graphite(c)Rubber(d)GlassAns:c

37.Carbonelectrodesarenotusedin(a)GLSlamps(b)electricarcfurnace(c)drycells(d)cinemaprojectorsAns:a

38.Solderisanalloyof(a)copperandaluminium(b)tinandlead(c)nickel,copperandzinc(d)silver,copperandleadAns:b

39______ismostcommonlyusedformakingmagneticrecordingtape(a)Silvernitrate(b)Ferricoxide(c)Smallparticlesofiron(d)SiliconironAns:b

40.Overheadtelephonewiresaremadeof(a)aluminium(b)steel(c)ACSRconductors(d)copperAns:b

41.______isanexampleofpiezoelectricmaterial.(a)Glass(b)Quartz(c)Corrundum(d)NeopreneAns:b



42._____isthemainconstituentofglass(a)Fe203(b)Si02(c)AI2O3(d)B2O3Ans:b

43.Agoodelectriccontactmaterialshouldhaveallofthefollowingpropertiesexcept(a)highresistivity(b)highresistancetocorrosion(c)goodthermalconductivity(d)highmeltingpointAns:a

44.Mostofthecommonmetalshave_____structure.(a)linear(b)hexagonal(c)orthorhombic(d)cubicAns:d

45.Whichofthefollowingaffectgreatlytheresistivityofelectricalconductors?(a)Composition(b)Pressure(c)Size(d)TemperatureAns:a

46.Thermonicemissionoccursin(a)vacuumtubes(b)copperconductors(c)ferritecores(d)transistorsAns:a

47._____isahardsolder.(a)Tinlead(6)Tinsilverlead(c)Copperzinc(d)NoneoftheaboveAns:c

48.Additionof0.3to4.5%silicontoiron_____theelectricalresistivityofiron.(a)increases(b)decreases(c)doesnotchangeAns:a

49.Superconductivitycanbedestroyedby(a)addingimpurities(b)reducingtemperatures(c)applicationofmagneticfield(d)anyoftheaboveAns:c

50.Nonlinearresistors(a)produceharmonicdistortion(b)followsOhm'slawatlowtemperaturesonly(c)resultinnonuniformheating(d)noneoftheaboveAns:a

51.Acarbonresistorcontains(a)carboncrystals(b)solidcarbongranules(c)pulverizedcoal(d)finelydividedcarbonblack.Ans:d

52.Whichofthefollowingmaterialsdoesnothavecovalentbonds?(a)Organicpolymers(b)Silicon(c)MetalsAns:c

53.Ingraphite,bondingis(a)covalent(b)metallic(c)VanderWaals(d)VanderWaalsandcovalentAns:d



54.Totalnumberofcrystalsystemsis(a)2(b)4(c)7(d)12Ans:c

55.ThenumberofatomsperunitcellinB.C.C.structureis(a)1(b)2(c)4(d)8Ans:b

56.Theconductivityofametalisdeterminedby(a)theelectronicconcentrationandthemobilityofthefreeelectrons(6)thenumberofvalenceelectronsperatom(c)either(a)or(b)(d)noneoftheaboveAns:a

57.Theresistivityofametalisafunctionoftemperaturebecause(a)theamplitudeofvibrationoftheatomsvarieswithtemperature(b)theelectrondensityvarieswithtemperature(c)theelectrongasdensityvarieswithtemperatureAns:a

58.Inacrystal,anatomvibratesatafrequencydeterminedby(a)theheatcontentofthecrystal(b)thetemperatureofthecrystal(c)thestiffnessofthebondsitmakeswithneighborsAns:c

59.Duetowhichofthefollowingreasonsaluminiumdoesnotcorrodeinatmosphere?(a)Aluminiumisanoblemetal(b)Atmosphericoxygencanonlydiffuseveryslowlythroughtheoxidelayerwhichisformedonthesurfaceofaluminium(c)NoreactionwithoxygenoccursftAnyoftheaboveAns:b

60.Theimpurityatomsissemiconductors(a)injectmorechargecarriers(6)reducetheenergygap(c)increasethekineticenergyofvalenceelectrons(d)alloftheaboveAns:b

61.Whichofthefollowingmaterialisnotasemiconductor?(a)Silica(b)Germanium(c)Selenium(d)GalliumarsenideAns:a

62.Carbonresistorsareusedextensivelybecausetheyare(a)easytomake(b)compact(c)inexpensive(d)alloftheabovereasonsAns:d

63.Carbonrodsareusedinwetanddrycellsbecause(a)carbonrodservesasconductor(b)carboncanresisttheattackofbatteryacid(c)both(a)and(b)(d)either(a)or(b)Ans:c

64.Duetowhichofthefollowingfactorsthebrushwearrateisaltered?(a)Speedofthemachine(b)Contactpressure(c)Surfaceconditionsofbrushandcommutator(d)Excessivesparking(e)AlloftheaboveAns:e

65.Whichofthefollowingarenonconductorsofelectricity?(a)Nonmetalsolidsexceptcarbon(b)Airandmostothergases(c)Purewaterandliquidsingeneralexceptmercury



(d)AlloftheaboveAns:d

66.Carbonbearingsareusedunderwhichofthefollowingconditions?(a)Wherelubricationisdifficultorimpossible(b)Wherecorrosivechemicalactionexists(c)Wherehightemperatureexists(d)AlloftheaboveAns:d

67.Whichofthefollowinghighresistancematerialshasthehighestoperatingtemperature?(a)Kanthal(b)Manganin(c)Nichrome(d)EurekaAns:a

68.Steelwireisusedas(a)overheadtelephonewire(b)earthwire(c)corewireofACSR(d)alloftheaboveAns:d

69.Lowresistivitymaterialsareusedin(a)transformer,motorandgeneratorwindings(b)transmissionanddistributionlines(c)housewiring(d)allaboveapplicationsAns:d

70.Platinumisusedin(a)electricalcontacts(b)thermocouple(c)heatingelementinhightemperaturefurnace(d)gridsofspecialpurposevacuumtubes(e)alloftheaboveAns:e

71.Whichofthefollowingisanadvantageofstrandedconductoroverequivalentsingleconductor?(a)Lessliabilitytokink(b)Greaterflexibility(c)Lessliabilitytobreak(d)AlloftheaboveAns:d

72.Duetowhichofthefollowingreasonscopperandaluminiumarenotusedforheatingelements?(a)Bothhavegreattendencyforoxidation(b)Bothhavelowmeltingpoint(c)Verylargelengthofwireswillberequired(d)AlloftheaboveAns:d

73.Copper,eventhoughcostly,findsuseinthewindingsofelectricalmachinesbecause(a)copperpointsofferlowcontactresistance(b)coppercanbeeasilysolderedandwelded(e)copperwindingsarelessbulkyandthemachinesbecomecompact(d)alloftheaboveAns:d

74.Whichofthefollowingmaterialsisusedformakingcoilsofstandardresistances?(a)Copper(b)Nichrome(c)Platinum(d)ManganinAns:d

75.Substanceswhosespecificresistanceabruptlydecreasesatverylowtemperaturearecalled(a)insulators(b)conductors(c)semiconductors(d)superconductorsAns:d

76.Whichofthefollowingmaterialsisthebestconductorofelectricity?(a)Tungsten(b)Aluminium(c)Copper(d)CarbonAns:c



77.isthepropertyofabsorbingmoisturefromatmosphere.(a)Solubility(b)Viscosity(c)Porosity(d)HygroscopicityAns:d

78.Thermocouplesaremainlyusedforthemeasurementof(a)temperature(b)resistance(c)eddycurrents(d)couplingcoefficientAns:a

79.Duetowhichofthefollowingfact,inIndia,aluminiumisreplacingcopper?(a)Aluminiumismoreductileandmalleablethancopper(6)Aluminiumisavailableinplenty,cheaperandlighterthancopper(c)Aluminiumhaslowerresistivitythanthatofcopper(d)AluminiumhaslesstemperaturecoefficientthancopperAns:b

80.Theconductionofelectricity,insemiconductors,takesplaceduetomovementof(a)positiveionsonly(b)negativeionsonly(c)positiveandnegativeions(d)electronsandholesAns:d

81.Whichofthefollowingisasemiconductormaterial?(a)Phosphorous(b)Rubber(c)Silicon(d)AluminiumAns:c

82.Seleniumis_____semiconductor.(a)extrnisic(b)intmisic(c)Ntype(d)PtypeAns:b

83.________hasthebestdampingproperties.(a)Diamond(b)Highspeedsteel(c)Mildsteel(d)CastironAns:d

84.Thephotoelectriceffectoccursonlywhentheincidentlighthasmorethanacertaincritical(a)intensity(b)speed(c)frequency(d)wavelengthAns:c

85.IftheresistanceofaconductordoesnotvaryinaccordancewithOhm'slawitisknownas(a)nonlinearconductor(b)reverseconductor(c)badconductor(d)nonconductorAns:a

86.Sparkplugmakesuseofwhichofthefollowingmaterialsforinsulation?(a)Porcelain(b)Slate(c)Asbestos(d)GlassAns:a

87.Theforbiddengapinaninsulatoris(a)large(b)small(c)nil(d)anyoftheaboveAns:a

88.Whichofthefollowingfactorsaffectresistivityofmetals?(a)Agehardening(b)Alloying(c)Temperature



(d)Coldwork(e)AlloftheaboveAns:e

89.Effectofmoistureontheinsulatingmaterialsisto(a)decreasedielectricconstant(b)decreasedielectricstrength(c)decreaseinsulationresistance(d)increasedielectricloss(e)alloftheaboveAns:e

90.Surfaceresistanceofaninsulatingmaterialisreducedduetothe(a)smokyanddirtyatmosphere(b)humidityintheatmosphere(c)both(a)and(b)(d)neither(a)nor(b)Ans:c

91.Superconductingmetalinsuperconductingstatehasrelativepermeabilityof(a)zero(b)one(c)negative(d)morethanoneAns:a

92.Inconductorsconductionofelectricitytakesplaceduetomovementof(a)electronsonly(b)positiveionsonly(c)negativeionsonly(d)positiveandnegativeions(e)noneoftheaboveAns:a

93.Thecarbonpercentageisleastin(a)lowcarbonsteel(b)wroughtiron(c)castiron(d)malleableironAns:b

94.ForaparticularmaterialtheHallcoefficientwasfoundtobezero.Thematerialis(a)insulator(6)metal(c)intrinsicsemiconductor(d)noneoftheaboveAns:b

95.Theconductivityofanextrinsicsemiconductorwithtemperature(a)decreases(b)increases(c)remainsconstantAns:c

96.Thecurrentduetoelectronflowinconductionbandistheholecurrentinvalenceband.(a)equalto(b)lessthan(c)greaterthan(d)anyoftheaboveAns:c

97.Foraholewhichofthefollowingstatementsisincorrect?(a)Holescanexistincertainsemiconductorsonly(b)Holescanexistinanymaterialincludingconductors(c)Holesmayconstituteanelectriccurrent(d)HolescanbeconsideredasanetpositivechargeAns:b

98.isanelementusedinsemiconductorswhoseatomshavethreevalenceelectrons.(a)Anacceptor(b)Adonor(c)Germanium(d)SiliconAns:a

99.Theminoritycarrierconcentrationislargelyafunctionof(a)forwardbiasingvoltage(b)reversebiasingvoltage(c)temperature(d)theamountofdopingAns:c



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100.Forgermaniumtheforbiddenenergygapis(a)0.15eV(b)0.25eV(C)0.5eV(d)0.7eVAns:d

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