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1、电工基础试题(一)（BasicexaminationquestionsofElectricalEngineering(1)）Thebasicquestionsofelectrician(a).Txttostayuplate,becausethecouragetoendtheday;stayinbedbecauseofthecouragetostarttheday.Afriendistoseethroughyouwhostillloveyou.Thenationalelectricalnetworkoperationoflow-voltagepartelectricianf
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5、andfamily)AchoiceThebasicunitofchargeis1.(C).A.secondB.ampC.CoulombD.kgIsequalto2.1amperes(B)a.A.103B.106C.109D.1023.auniformwirestretchedfor3timestheoriginallength,whiletheresistancetotheoriginal(Ctimes).A.3B.1/3C.9D.1/9The4.generationofseriesresonantcondition(C).A.XL,XcB.XLXcC.XLD.<=XcX
6、L=XcE.XL=XcAttheendofthe5.voltageno-loadlongHVtransmissionlines(B)endvoltage.A.belowB.ishigherthanC.equaltoD.lessthanorequalto6.powerthree-phasesymmetricalload,whichisbetweenthephaseangle(B).TheA.linevoltageandlinecurrentB.phasevoltageandlinecurrentTheC.linevoltageandphasecurrentandphasev
7、oltagephasecurrentD.7.whenthepowerfrequencyincreases,respectivelywithR,Lbulbseries,C3circuitinparallel,and(B)increasethebrightnessofthebulbseries.A.RB.LC.CD.RandLE.RandC8.oftheratedvoltageis220Vthelightbulbinthe110Vpowersupply,lightingpoweristheoriginal(B).A.2B.4C.1
