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1、全国2010年10月高等教育电力系统基础自考试题（NationalhighereducationpowersystemfoundationexaminOctober2010）January2010nationalhighereducationselfstudyexaminationBasicexaminationquestionsofpowersystemCourseCode:02300Asinglechoice(thetitleof20items,eachitemof1points,atotalof20points)Inthe
2、fouroptionofeachitemlistedinonlyoneisinlinewiththerequirementsofthesubject,pleasefillinthecodeinquestionafterthebrackets.Thewrongchoiceornot,choosenopoints.1.minimumloadofpowersystem,eachuseralwayssum______minimumload()A.equalsB.greaterthanC.islessthanD.isequalto0.5t
3、imes2.neutralungroundedpowersystem,whenthesingle-phasegroundfaultoccurs,theinterlinevoltage()A.invariantB.equalszeroC.timeshigherD.timeshigher3.,thepurposeoftranspositionofoverheadlinesis()A.reducesresistancetoasymmetryB.reducesconductivityasymmetryC.reducesreactance
4、asymmetryD.reducescoronavoltage4.,theelectricalparameterBTofthetransformerismainlydeterminedbywhichexperimentaldataA.P0B.PKC.UK%D.I0%5.doublewindingstep-uptransformerisusedasstep-downtransformeraftersecondaryvoltage()ElevatedA.B.decreaseC.invariantD.iszero6.oneofthep
5、urposesofpowerflowcalculationis()A.checkthefrequencyofthesystemtomeetthepowerqualityrequirementsB.checkforatmosphericovervoltageC.checkthestabilityofthesystemD.checkwhetherthevoltageofeachnodemeetstherequirementofpowerquality7.powersystemanalysis,aformulaforthelinevo
6、ltage,U,power:(a)A.phasepowerB.two-phasepowerC.three-phasepowerD.one,twophasescanbe8.thepowerflowingthrougharesistorwhenitproducesanactivelossA.canonlybeactiveB.canonlybereactiveC.cannotbereactiveD.isbothactiveandreactive9.thefollowingexpressioniscorrect()A.B.C.D.10.
7、whenthepowerflowofpowersystemiscalculated,theunitofphysicalquantityisMvar,andthequantityis()A.activepowerB.reactivepowerC.apparentpowerD.activepower11.,balancethenumberofnodesinthepowersystemA.musthaveoneB.islargeC.smallorno?ThelargestnumberofD.12.closednetwork,whent
8、hepowerflow,thesolutionshouldbeinthenetworkA.arbitrarynodeB.reactivepowerpointC.activepointdivisionD.nonpowerequinox13.themostfrequ
