【MOOC】Electrotechnics Ⅰ (Electrical Technology)-Dalian University of Technology 中国大学慕课MOOC答案

【MOOC】ElectrotechnicsⅠ(ElectricalTechnology)-DalianUniversityofTechnology中国大学慕课MOOC答案Quiz1、【单选题】Adevicethatsupplieselectricalenergyorsignals.Itiscalled().本题答案：【source】2、【单选题】Whichoneofthefollowingisnotasignalcircuit().本题答案：【powerdistributing】3、【单选题】Thecircuitinthefigureisasimpletemperaturemeasuringcircuit.Itisa()circuit.本题答案：【signalcircuit】4、【单选题】Whichofthefollowingisanactivetwo-terminalnetwork?().本题答案：【】5、【多选题】Whatdoesitusuallymeanwhenwesaytheloadincreases?本题答案：【power#current】6、【多选题】WhichofthefollowingisnotAC?本题答案：【#】Quiz1、【单选题】Whatisthepotentialofpointb?().本题答案：【2V】2、【单选题】Whatisthepotentialofpointb?().本题答案：【-6V】3、【单选题】Workdonebynon-electricfieldtomoveaunitchargethroughthesource.()本题答案：【EMF】4、【单选题】Whatisthepowerconsumedbythebulbwithacurrentof1.6Awhenavoltageof6Visconnectedacrossit?().本题答案：【9.6W】Quiz1、【单选题】GiventhatUS=100V，terminalvoltageR0=10ohm,currentI=4A，FindthepowerprovidedbythesourceP(Poweroutput)?本题答案：【240W】Quiz1、【单选题】Findthepotentialofpointa.本题答案：【2V】Quiz1、【单选题】Findoutwhichonewillabsorbpower?本题答案：【Onlythevoltagesource】Quiz1、【单选题】thevoltagesourceandthecurrentsourcecanbeconvertedtoeachother.ThenfindIs.().本题答案：【3A】Quiz1、【单选题】FindtheterminalvoltageU().本题答案：【U=Us-IR】2、【单选题】FindtheterminalvoltageU().本题答案：【U=-Us+IR】3、【单选题】Thenumberofbranchesis().本题答案：【4】4、【单选题】Thenumberofbranchesis().本题答案：【6】Quiz1、【填空题】Acircuithas3nodesand7branches.Thenumberofcurrentequationsandvoltageequationsshouldbelistedrespectivelywhenusingbranchcurrentmethodtosolvethecurrentofeachbranch.Thenumberofthevoltageequationsis().本题答案：【5】2、【填空题】FindI=()A.本题答案：【5】Quiz1、【单选题】FindIbysuperpositiontheorem.本题答案：【4A】Quiz1、【单选题】FindIbyThévenin'sTheorem().本题答案：【1A】AssignmentsforChapterOneAssignmentsforChapterOne-2TestforChapterOne1、【单选题】InthecircuitshowninthefollowingFigure.WhentheresistanceR2increases,thecurrentIwill().本题答案：【increase】2、【单选题】InthecircuitshowninthefollowingFigure,thevoltagebetweentheAandB,ＵABis（）.本题答案：【-2V】3、【单选题】InthecircuitshowninthefollowingFigure.WhentheresistanceR1increases,thevoltageＵ2will（）.本题答案：【remainthesame】4、【单选题】FindthevoltageＵ=()V.本题答案：【15V】5、【单选题】Findthecircuitelementsthatprovidepower().本题答案：【currentsource】6、【单选题】InthecircuitshowninthefollowingFigure.I=().本题答案：【2A】7、【单选题】GiventhatU=2V,findthepowergeneratedbythevoltagesourcePs=().本题答案：【2.4W】8、【单选题】InthecircuitshowninthefollowingFigure.UAB=().本题答案：【1V】9、【单选题】InthecircuitshowninthefollowingFigure.I=().本题答案：【2A】10、【单选题】Findtherightexpression.()本题答案：【】11、【单选题】FindU=().本题答案：【-2V】12、【单选题】GiventhatU=0.FindUS=().本题答案：【40V】13、【单选题】Whatisthemeaningoftheloadin“LoadDecrease”?本题答案：【power】14、【单选题】FindthepotentialofA.本题答案：【8V】15、【单选题】FindtheterminalvoltageU=().本题答案：【-18V】16、【填空题】FindI=()A本题答案：【1】17、【填空题】FindUoc=()V.本题答案：【-8】18、【填空题】FindI=()A.本题答案：【4.8】19、【填空题】FindI=()A.本题答案：【3】20、【填空题】FindUoc=()V.本题答案：【2】21、【填空题】FindI=()A.本题答案：【2】22、【填空题】FindtheequivalentresistanceRab=()ohm.本题答案：【4】23、【填空题】FindI=()A.本题答案：【2】24、【填空题】FindI=()A.本题答案：【1】25、【填空题】FindＵab=()V,whentheswitchisopen.本题答案：【5】Quiz1、【判断题】Ifthevoltageacrosstheinductoriszero,thestoredenergyiszero.本题答案：【错误】2、【判断题】Iftheswitchisclosedatt=0,therewillbeatransientprocess.本题答案：【错误】Quiz1、【单选题】Thecircuitisstable.Theswitchisclosedatt=0.Theni(0+)is().本题答案：【2A】Quiz1、【判断题】Thefollowingcircuitisafirstordercircuit.本题答案：【错误】2、【判断题】Thefollowingcircuitisafirstordercircuit.本题答案：【正确】Quiz1、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Theni(0+)=().本题答案：【0A】2、【单选题】Thecircuitisstablebeforeswitching(noenerystorage).Theswitchisclosedatt=0.Theni(0+)is().本题答案：【0A】Quiz1、【单选题】Thecircuitisstable.Theswitchisclosedatt=0.Thenthetimeconstantis().本题答案：【0.2s】2、【单选题】Theswitchisclosedatt=0.Thenthesteadystatevalueuis().本题答案：【3V】Quiz1、【单选题】Theswitchisthrownfromatobatt=0,thenthetypeofresponseis().本题答案：【Completeresponse】2、【单选题】TheswitchisthrownfromAtoBatt=0,thenthetypeofresponseis().本题答案：【Zero-inputresponse】AssignmentsforChapterTwoTestforChapterTwo1、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Thenthetimeconstant=().本题答案：【1.8s】2、【单选题】Thecircuitisstable.ThenI=().本题答案：【2A】3、【单选题】Thecircuitisstable.ThenI=().本题答案：【2A】4、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Thenthetimeconstantis().本题答案：【1s】5、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Thenthetimeconstantis().本题答案：【0.2s】6、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Thenthetimeconstantis().本题答案：【2s】7、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Thentheinitialvalueofthevoltageacrosstheresistorof3is().本题答案：【9V】8、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.ThenthesteadystateofuCis().本题答案：【15V】9、【单选题】Thecircuitisstablebeforeswitching.Theswitchisopenatt=0.Theni(0+)is().本题答案：【1.2A】10、【单选题】Thecircuitisstablebeforeswitching.Theswitchisopenatt=0.Thenthetimeconstantis().本题答案：【1.5s】11、【单选题】Thecircuitisstablebeforeswitching.Theswitchisthrowntopoatt=0.Thenthetimeconstantis().本题答案：【0.2s】12、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.ThenuL(0+)=().本题答案：【-12V】13、【单选题】Thecircuitisstablebeforeswitching.Theswitchisthrownfrom1to2att=0.TheniC(0+)=().本题答案：【3A】14、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.TheniC(0+)=().本题答案：【15mA】15、【单选题】Thecircuitisstablebeforeswitching.Theswitchisthrownfrom1to2att=0.ThenthesteadystatevalueofuC=().本题答案：【0V】16、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0,thenthetimeconstantis().本题答案：【0.1s】17、【单选题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0,thenthetimeconstantis().本题答案：【0.1s】18、【填空题】GiventhatuC(0-)=30V.Theswitchisclosedatt=0.ThenuL(0+)=()V.本题答案：【10】19、【填空题】Thecircuitisstablebeforeswitching.Theswitchisopenatt=0,thenthetimeconstantis()s.本题答案：【1】20、【填空题】Thecircuitisstablebeforeswitching.Theswitchisopenatt=0.Findu(0+)=()V.本题答案：【8】21、【填空题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.Findi2(0+)=()A.本题答案：【1】22、【填空题】Thecircuitisstablebeforeswitching.Theswitchisclosedatt=0.ThenuL(0+)=()V.本题答案：【8】Quiz1、【单选题】Giventhati=10sin（1000t–70°）A.Findtheinitialphase().本题答案：【–70°】2、【单选题】Giventhati=10sin（1000t–70°）A.Theeffectivevalueofthecurrentis()A.本题答案：【7.07】3、【单选题】Theunitofangularfrequencyis().本题答案：【rad/s】Quiz1、【单选题】本题答案：【】Quiz1、【单选题】本题答案：【5】Quiz1、【单选题】Giventhatu=14.14sin314tV,C=140μF,thentheeffectivevalueofthecurrentiisabout()A.本题答案：【0.44】Quiz1、【单选题】本题答案：【25】2、【填空题】Thereadingofthevoltmeteris()V.本题答案：【5】3、【填空题】Thereadingofthevoltmeteris()V.本题答案：【10】Quiz1、【填空题】FindtheeffectivevalueofthecurrentI=()A.本题答案：【(21,23)】Quiz1、【填空题】Thereadingoftheammeteris()A.本题答案：【5】2、【填空题】Thereadingoftheammeteris()A.本题答案：【4】3、【填空题】Findthetotalimpedance().本题答案：【10】Quiz1、【单选题】InaseriesRLCACcircuit,ifthecurrentinthecircuitisI,thetotalvoltageisU,theactivepowerisP,thereactivepowerisQ,andtheapparentpowerS,thentheimpedanceis().本题答案：【】2、【单选题】InaseriesRLCACcircuit,theactive(average)powerP=().本题答案：【】Quiz1、【单选题】本题答案：【】2、【单选题】Inordertoimprovethepowerfactorofinductiveloadcircuit,thecommonlyusedmethodis（).本题答案：【Parallelcapacitance】AssignmentsforChapterThreeAssignmentsforChapterThree-2TestforChapterThree1、【单选题】Findtheinitialphaseofu().本题答案：【–90°】2、【单选题】Giventhati=100sin（314t－30°）A,u=311sin（314t+60°）VFindthephasedifferencebetweenuandi().本题答案：【90°】3、【单选题】SeriesRLCACcircuit.GiventhatXL=XC=20Ω，R=10Ω，theeffectivevalueoftotalvoltageis220V.Thentheeffectivevalueofthevoltageacrossthecapacitoris().本题答案：【440V】4、【单选题】Twosinusoidalalternatingcurrentsi1andi2.I1=I2=4A.Thetotalcurrenti=i1+i2.Theeffectivevalueofthetotalcurrentisstill4A,thenthephasedifferencebetweenthemis().本题答案：【120°】5、【单选题】WhensinusoidalACcurrentpassesthrougharesistiveelement,whichofthefollowingrelationiscorrect().本题答案：【】6、【单选题】Inapureinductivecircuit,iftheinitialphaseofcurrentis-60°,thentheinitialphaseofvoltageis().本题答案：【30°】7、【单选题】Inacapacitivecircuit.XC=100Ω.Thevoltageacrossthecapacitoris,thenitscurrentshouldbe().本题答案：【】8、【单选题】hesamecoil(canbeseenasaresistorconnectedinserieswithandinductor)isconnectedtoDCandACpowersupplyrespectively.ThentheinductivereactanceXLis()Ω.本题答案：【16】9、【单选题】Whichoneisright?()本题答案：【uilagsuo】10、【单选题】Thereadingofthevoltmeteris()V.本题答案：【32】11、【单选题】ThephasordiagramofterminalvoltageandcurrentisshownintheFigure.Thecircuitexhibit()characteristics.本题答案：【capacitive】12、【单选题】SeriesRLCACcircuit，Findtherightexpressionof（）.本题答案：【】13、【单选题】InanACcircuit,thevoltageappliedacrossthecircuitis本题答案：【0】14、【单选题】Thepowersourcesinthethreecircuitsarethesame,thebulbsarethesameandcanemitlight,whichbulbisthebrightest?()本题答案：【】15、【单选题】Acoilandacapacitorareconnectedinseries.GiventhatR=4Ω，XL=3Ω，u=220sin(314t+π/4)V，i=44sin(314t+84°)A.ThenXC=()Ω本题答案：【6】16、【单选题】GiventhatR=60Ω,C=125μF,.Thentheeffectivevalueofiis().本题答案：【1.1】17、【单选题】TheACpowersupplyvoltageremainsunchanged.Whenthefrequencydecreases,thevoltmeterreadingwill().本题答案：【decrease】18、【单选题】Findthetotalimpedance().本题答案：【】19、【单选题】Anincandescentlampisconnectedinserieswithacapacitor.TheACpowersupplyvoltageremainsunchanged.Whenthefrequencydecreases,thecapacitivereactanceXCwill().本题答案：【increase】20、【单选题】Ginventhat本题答案：【】21、【单选题】Whichofthefollowingisnotright?()本题答案：【】22、【填空题】Thereadingofthevoltmeteris()V.本题答案：【5】23、【填空题】SeriesRLCcircuit,Givethat:URL=100V,UC=60V,Thetotalvoltageandthetotalcurrentisinphase.Thenthetotalvoltageis()V.本题答案：【80】24、【填空题】本题答案：【10】25、【填空题】GiventhatR=20Ω,L=48mH,本题答案：【(8,9)】Quiz1、【单选题】Thethree-phase?-connectedgeneratorisdrivingabalancedloadsuchthateachphasecurrentis10Ainmagnitude.When=10∠30°A,then=().本题答案：【17.3∠120°A】2、【单选题】Inacertainthree-wire,Y-connectedgenerator,thephasevoltagesare1.0kV.themagnitudeofthelinevoltagesis（）kV.本题答案：【1.732】3、【单选题】Inathree-phasesystem,thevoltagesareseparatedby().本题答案：【120】Quiz1、【单选题】Ifthesourcelinevoltagesare380V,Y-connectedload,themagnitudeoftheloadlinevoltagesis().本题答案：【380V】2、【单选题】AcertainY-connectedsourceproducesphasecurrentsof15A.iftheloadisY-connected,eachloadphasecurrentis().本题答案：【15.0A】3、【单选题】AY-connectedsourcedrivinga?-connectedload.Thelinevoltagesofsourceare380V,eachimpedanceofabalancedthree-phaseloadis85.6+j50.Theloadlinecurrentsare()A..本题答案：【6.6】Quiz1、【单选题】=30V,=1.2A,andthepowerfactoris0.257.ThetotalapparentpowerinabalancedY-connectedloadis().本题答案：【62.35VA】2、【单选题】Theaveragepowerineachphaseofabalancedthree-phasesystemis1,200W,andthetotalpoweris().本题答案：【3600W】3、【单选题】InacertainY-connectedbalancedload,thelinevoltagesare380Vandtheimpedancesare30+j40?.thetotalreactivepoweris().本题答案：【2.316kvar】AssignmentsforChapterFourTeatforChapterFour1、【单选题】Twomajorpartsofanacgeneratorare().本题答案：【rotorandstator】2、【单选题】Thephasecurrentproducedbyacertain240V,Y-connectedgeneratoris12A.Thecorrespondinglinecurrentis().本题答案：【12A】3、【单选题】Acertain?-connectedgeneratorproducesphasevoltagesof30V.Themagnitudeofthelinevoltagesare().本题答案：【30V】4、【单选题】Ifthesourcephasevoltagesofa?-Ysystem（A?-connectedsourcedrivingaY-connectedload）are220V,themagnitudeoftheloadphasevoltagesis（）.本题答案：【127V】5、【单选题】Abalanced,three-phase,-connectedloadhasalinevoltageof200Vandatotalpowerconsumptionof4800Watalaggingpowerfactorof0.8.Thephasecurrentofeachloadis().本题答案：【10A】6、【判断题】Voltagesacrossthegeneratorwindingsarecalledlinevoltages本题答案：【错误】7、【判断题】AY-connectedsystemcanhaveeitherthreeorfourwires.本题答案：【正确】8、【判断题】Ina?-connectedgeneratorthelinecurrentsandthephasecurrentsareequal.本题答案：【错误】9、【判断题】Inabalancedsystemtheneutrallinecanberemoved.本题答案：【正确】10、【判断题】Inacertain?-connectedbalancedload,thelinevoltagesare250Vandtheimpedancesare50∠30°?.thetotalapparentpoweris3.75kVA.本题答案：【正确】Quiz1、【单选题】TheunitofMagneticfluxis().本题答案：【Wb】2、【单选题】MagneticFluxperunitofcross-sectionalareais().本题答案：【MagneticFluxDensity】3、【判断题】MagneticFluxDensityBisavector.WhileMagneticFieldIntensityHisnotavector.本题答案：【错误】4、【判断题】MagneticFluxDensityBdependsonboththecurrentandmaterialproperties.本题答案：【正确】Quiz1、【单选题】Whatisthemeaningof?本题答案：【Leakageflux】2、【单选题】Whatisthemeaningof?本题答案：【Remanence】3、【单选题】Whichoneissoftmaterialaccordingtothehysteresisloopsoffourdifferentmagneticmaterials?本题答案：【】4、【单选题】Aclosedpathfollowedbymainmagneticfluxisknownasa().本题答案：【Magneticcircuit】5、【单选题】ThechangeofBalwayslagsbehindthechangeofH.Thisphenomenoniscalled().本题答案：【Hysteresis】Quiz1、【单选题】Whatisthemeaningof?本题答案：【Permeabilityoftheairgap】2、【单选题】TheequivalentofthecurrentIinmagneticohm'slawis()?本题答案：【Flux】3、【单选题】WhatisMMF?本题答案：【MagnetomotiveForce】4、【单选题】WhathappenstotheMMFwhenthemagneticfluxdecreases?本题答案：【Decreases】Quiz1、【单选题】WhichoneisnotthemajorpartofElectromagnet?本题答案：【rotor】Quiz1、【单选题】GiventhatthemagneticcircuitofDCelectromagnet.ThevoltageUisconstant.HowwillthecoilcurrentIchangewhentheairgaplengthincreases().本题答案：【remainunchanged】2、【单选题】GiventhatthemagneticcircuitofDCelectromagnet.ThevoltageUisconstant.HowwilltheMagneticfluxchangewhentheairgaplengthincreases().本题答案：【decrease】Quiz1、【单选题】GiventhatthemagneticcircuitofACelectromagnet.ThevoltageUisconstant.HowwillthecoilcurrentIchangewhentheairgaplengthincreases().本题答案：【increase】2、【单选题】GiventhatthemagneticcircuitofACelectromagnet.ThevoltageUisconstant.HowwilltheMagneticfluxchangewhentheairgaplengthincreases().本题答案：【remainunchanged】Quiz1、【单选题】Whichofthefollowingplaysaroleintransmittingelectricenergyinthetransformer（）.本题答案：【Mainmagneticflux】2、【单选题】Theworkingprincipleoftransformerisbasedon（）.本题答案：【Faraday’slawofelectromagneticinduction】Quiz1、【单选题】Theexternalcharacteristicofpowertransformerisrelatedtothenatureofload.Whentheloadisinductive,itsexternalcharacteristiccurvewillbe（）.本题答案：【】2、【单选题】Theratedcapacityofasingle-phasetransformerisSN=50kV·A,theno-loadcurrentI0is3%oftheratedcurrent,theratedvoltagesare10kV/230V,thesecondarysidevoltageatfullloadis220V,FindthevoltageregulationVR.（）.本题答案：【4.35%】Quiz1、【单选题】Whenthereisaload,themainmagneticfluxofthetransformerisgeneratedby().本题答案：【PrimarycurrentI1andSecondarycurrentI2together】2、【单选题】Atransformerisoperatingatnoloadconditionwithratedvoltageof220Vappliedtotheprimaryside,andtheresistanceoftheprimarywindingismeasuredas10.Trytofindtheprimarycurrent().本题答案：【Approximateto0A】Quiz1、【单选题】AloadwithRL=8isconnectedtoasignalsourcethroughatransformer,theinternalresistanceR0ofthesignalsourceis800,andthenumberofturnsN1oftheprimarywindingofthetransformeris1000.iftheloadgetsthemaximumpowerthroughimpedancematching,thenumberofturnsN2ofthesecondarywindingofthetransformershouldbe().本题答案：【100】Quiz1、【单选题】A10kV·Atransformersuppliespowertoaloadwithapowerfactorof0.8infullload.Giventhatthecorelossis300W,thecopperlossis400W.Ignorethevoltageregulation.Findtheefficiencyofthetransformer().本题答案：【92%】Quiz1、【单选题】Thesiliconsteelsheetusedintransformercoreismaterial().本题答案：【】AssignmentsforChapterFiveTestforChapterFive1、【单选题】TwoidenticalACironcore-windingsarepoweredbytwovoltagesources.Thevoltagesofthetwopowersourcesarethesamewhilethefrequenciesaredifferent(f1f2),thenwhichfollowingdescriptionisrightabout1()2.本题答案：【】2、【单选题】ForDCcorecoil,whenthenumberofturnsNofthecoilisdoubled,thenthemagneticfluxwill（）.本题答案：【increase】3、【单选题】ForanACcorecoil,whenthecorecross-sectionalareaAisdoubled,themagneticfluxwill().本题答案：【remainunchanged】4、【单选题】ADCelectromagnetwithratedvoltageof100VisconnectedtoanACpowersupplywithvoltageof100V.CoilcurrentIwill().本题答案：【decrease】5、【单选题】ADCelectromagnetwithratedvoltageof100VisconnectedtoanACpowersupplywithvoltageof100V.Magneticfluxthroughthecoilwill().本题答案：【decrease】6、【单选题】Therelationshipbetweencopperlossofatransformeris().本题答案：【proportionaltoloadcurrentsquared】7、【单选题】Therelationshipbetweenironlossofatransformerandtheload().本题答案：【Ithasnothingtodowiththeloadandremainsunchanged】8、【单选题】AloadRL=8isconnectedtoasignalsourcethroughatransformer.TheinternalresistanceR0ofthesignalsourceis800,andthenumberofturnsoftheprimarywindingN1is1000.Iftheloadgetsthemaximumpowerthroughimpedancematching,thenthenumberofturnsofthesecondarywindingN2shouldbe().本题答案：【100】9、【单选题】Asingle-phasetransformerwithratedcapacityofSN=50kV?Aandtheratedvoltageof10kV/230V.Giventhattheno-loadcurrentI0is3%ofratedcurrentandtheoutputvoltageatfullloadis220V.Thenthevoltageregulationis().本题答案：【4.35%】10、【单选题】Forcapacitiveload,whenthecurrentonthesecondarysideincreases,theoutputvoltageonthesecondarysidewill().本题答案：【increase】11、【填空题】ACelectromagnet,IfUandfremainthesame.Thecurrentiwill(increase/reduce/unchanged)whentheairgapisdecreased.本题答案：【reduce】12、【填空题】Atransformerisusedforimpedancematching.Theresistanceofthespeakershouldbeincreasedfrom4Ωto100Ωinordertoconnectproperlywiththeamplifier.Howmuchistheimpedancetransformationratio.本题答案：【5】13、【填空题】TwoidenticalACironcore-windingsarepoweredbytwovoltagesources.Thevoltagesofthetwopowersourcesarethesamewhilethenumberofturnsaredifferent(N1N2),then12.(,,=)本题答案：【<】14、【填空题】A50kV·Asingle-phasetransformerwhichratedvoltageis6600/230V.cosφ2=0.8.Giventhatthecorelossis600W,thecopperlossis1500W.U2=220V(full-loading).Findtheefficiencyofthetransformer(full-loading).%本题答案：【(94,95)】15、【填空题】Asingle-phasetransformerwithacapacityof50kV×Aandratedvoltageof3300/220V.Thetransformerisoperatingatitsratedcapacity.Iffluorescentlamps(40W,220V)withpowerfactorof0.5areusedonthesecondaryside,howmanylampscanbeconnectedalltogether(ignorethelossofballast).本题答案：【625】Quiz1、【单选题】WhichoneisnotthemajortypeOfasynchronousmotorbasedontypeoftherotorwinding?()本题答案：【Powersynchronousrotor】2、【单选题】What’sthenameofthemotorcomponentinthepicture().本题答案：【Rotor】3、【单选题】Whichoneofthefollowingisnotawoundrotor?()本题答案：【】4、【单选题】Asynchronousmotorisalsocalled()?本题答案：【Inductionmotor】Quiz1、【单选题】Findthesynchronousspeedofthemotorwhosestatorcoreisshowninthepicture.()本题答案：【750r/min】2、【单选题】Whatarethesynchronousspeedswhenthepairsofpolesis3atafrequencyof60Hz?()本题答案：【1200r/min】Quiz1、【单选题】Themaximumtorqueofthree-phaseasynchronousmotoris().本题答案：【proportionaltothevoltagesquared】2、【单选题】Athree-phaseasynchronousmotorwithratedspeedof1450r/min.Findthepairsofpoles().本题答案：【2】3、【单选题】Whatisthevalueofslipatthemomentofstarting?()本题答案：【1】Quiz1、【单选题】Theoutputpowerofathree-phaseasynchronousis().本题答案：【Mechanicalpower】2、【单选题】Findtheunitoftorque().本题答案：【N·m】Quiz1、【单选题】Thepowerinput(electricpower)ofthemotoris()kW.本题答案：【3.58】2、【单选题】Theratedpowerofthree-phaseasynchronousmotorreferstothe()ofthemotor.本题答案：【mechanicalpoweroutputontheshaft】3、【填空题】1Thespeedofrotatingmagneticfield(synchronousspeed)is()r/min,accordingtotheimformationonthenameplate.本题答案：【1000】Quiz1、【单选题】Themechanicalcharacteristicsandtheparametersofathree-phaseasynchronousmotor(50Hz,11kW)areshowninthefigure.Iftheloadtorqueis180N×m,then().本题答案：【itcanbestarteddirectlyandrunforashorttime,butnotfitforlongtermrunning】2、【填空题】Themaximumtorqueofthethree-phaseasynchronousmotoris900N·m,andtheratedtorqueis450N·m,thentheoverloadcoefficientofthemotoris().本题答案：【2】3、【填空题】Thestatorlinevoltageofathree-phaseasynchronousmotordecreasesby10%comparedwiththeratedvoltage,anditstorquedecreasesbyabout()%comparedwiththeratedtorqueratio.本题答案：【20】Quiz1、【单选题】WhichoneisrightabouttheY-△startingofthree-phaseasynchronousmotor().本题答案：【Thestatorphasevoltageisreducedbutthelinevoltageremainsunchanged】2、【单选题】Whichoneisrightabouttheautotransformerstartingofathree-phaseasynchronousmotor().本题答案：【Thelinevoltageandphasevoltageofthestatorarereducedatthesametime】Quiz1、【单选题】WhenVVVFspeedcontrolmethodisusedforthespeedcontrolofathree-phaseasynchronousmotor.IftheoutputvoltageandfrequencyoftheVVVFdrivesystemarereduced,thespeedwill().本题答案：【decrease】AssignmentsforChapterSixTestforChapterSix1、【单选题】Findtheslips()accordingtothenameplate.本题答案：【0.04】2、【单选题】Thedifferencebetweencage-typeasynchronousmotorandwound-typeasynchronousmotorismainlyin().本题答案：【Rotorwinding】3、【单选题】Electromagnetictorqueofathree-phaseasynchronousmotorisproducedbytheinteractionbetween().本题答案：【rotatingmagneticfieldandtheactivecomponentsofrotorcurrent】4、【单选题】Ifthefrequencyis60Hz.Giventhepa