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1、电工基础考试试题（BasicexaminationquestionsofElectricalEngineering）2007fallsemesterelectricianfoundationfinalexampaperFillintheblanks(eachemptypart)1.Thecircuitisaclosedloopconsistingof,,etc..2.Theelectricityusedinhouseholdlifeisalternatingcurrent,andthevoltageeffectivevalueisvolts.3.Thesafetyvoltageisvol
2、ts.4,R1=5,R2=3,iftworesistorsareconnectedinseries,thetotalresistanceisomega.5,withmultimetertestresistance,everytimechangeratefiles,shouldbere.6、constantvoltagesourceisprovided,constantcurrentsourceisprovided.7transformermainlyconsistsoftwoparts.Thecoreislaminated.8.Themotorconsistsoftwobasicpart
3、s.9,three-phasealternatingcurrentreferstowhatthree-phase?,,.Two,multiple-choicequestions(eachsubjectpoints)1,theratedvoltageofanelectricapplianceis220V,anditshouldbeconnectedtothepowervoltageof380V.Aseriescapacitor,Bseriesresistor,Cshuntresistor,Dshuntcapacitor2,ingeneral,diodes,transistors,resis
4、tors,pinsare.A233B332C232D2223.Thesamebattery.Thelightbulbispoweredbytwobatteriesconnectedinseries.Thelightsecondispoweredbytwobatteriesinparallel,andthetwolamp.AisasbrightasB,alightison,CBislight,Disnotsure4,thefollowingcomponents,withfilteringfunctionis.Aresistor,Binductor,Ccapacitor,Ddiode5,el
5、ectricitycanproducemagnetism,andwhenthecurrentisthesame,whichofthefollowingsetsproducesthegreatestmagneticfieldstrength?.Astraightwire,Bsinglecoil,Ccorelesssolenoid,Dwithironcoresolenoid6,windingpartsofthetransformercannotbeusedbelowwhatkindofwindingsystem?.AenameledwireBlineCDbarecopperwire.7,th
6、ree-phasealternatingcurrent,thelinevoltageandphasevoltagearerespectivelyhowmanyvolts?.A220220B220380C380220D3803808,theclosedwireforcuttingmagneticinductionlinemovementcanproducecurrent,thecurrentsizeandwhatfactorsareirrelevant.Amagneticfieldstrength,Btraversespeed,Cwirelengthinmagneticfield,Dwir
7、emovementtimeThree,Janeanswer(eachsubjectpoints)1,drawingandexplainshowtoapplythedoubleswitchinthetwocontrollamp?2,drawthreephaseloadtriangle,starconnection,andsayaboutthisdifferentconnection,plusthevoltageontheloadeac
