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1、电工考试选择题（Electricalexaminationmultiple-choicequestions）Two,singlechoicequestions1.electricalstaffshouldexaminethesafetyregulationsofelectricpowerindustryonceayear.Incaseofdiscontinuouselectricalworkformorethan(continuous),itisnecessarytoreviewtheregulationsagainand
2、resumetheworkafterpassingtheexamination.BThe2.weremarked"220V,40W",itsmeaningis().B3.neutralgroundingvoltagerisestophasevoltagewhensinglephasegroundingoccursinsmallcurrentgroundingsystem.Thegroundvoltageofnonearthingtwois().C4.TransformerOilplay()role.C5.installth
3、eelectricalinstrumenthousingonthecontrolpaneloftheswitchboard.BWhen6.neutralungroundedsystemoccurssinglephasegrounding,itshould().CThecircuitof7.loadswitchusedforcuttingandclosingis()B8.terminalsofpowercables(A)9.forthesafetyofpersonalandequipment,thetwosideofthet
4、ransformermustbeimplemented()C10.theso-calledthree-phasesymmetricalloadis()D11.loadisconnectedbystarortriangle,accordingto()D12.theneutralpointsof220kVandaboveareadoptedinourcountry.AMorethan13.Motorsshouldbestartedatthebeginning.AWhenthe14.currenttransformerworks
5、normally,thetwosidecircuitcan()B15.whenthelampholderofthelightinglampisconnectedtoelectricity,().A16.tomeasuretheinsulationresistanceoftransformerwindingsabove10kV,andadopt()Vohmmeter.A17.whenmeasuringtheinsulationresistanceoftransformercoilwithratedvoltageoverlkV
6、,the(V)ohmmetermustbeused.DTheovercurrentprotectionofthe18.lineistheprotection.C19.thegroundingofelectricalequipmentbelongsto().CThemainfunctionof20.disconnectoris().C21.inoperation,thevoltagetransformerneedstobeburnedoutinordertoavoidthegreatshort-circuitcurrenta
7、ndburnoutthetransformer.D22.whenthecurrentinthecoil(thecoil),thetwoendsofthecoilproduceselfinductanceelectromotiveforce.AIna23.ACcircuit,thecurrentvalueofacomponentisconstantovertime.C24.aresistormarkedwith"1K,10W"isallowed.B25.weusethelightingvoltageof220V,whichi
8、salternatingcurrent.AThethreeelementofthe26.sinealternatingcurrentisthemaximum,frequencyand().D27.inaconstantvoltageDCcircuit,whentheresistanceincreases
