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1、姓名学号学院专业座位号(密封线内不答题)……………………………………………………密………………………………………………封………………………………………线……………………………………线………………………………………_____________________…诚信应考,考试作弊将带来严重后果!华南理工大学期末考试《电路与电子技术》(双语)试卷B考试时间:120minutesDate:January,15,2013注意事项:1.考前请将密封线内填写清楚;2.所有答案请直接答在答题纸上;3.考试形式:闭卷;4.本试卷共11大题,满分100分,考试时间120分
2、钟。题号1234567891011总分得分评卷人6881010101010101081.considerthecircuitshowninFig.1,findcurrentI1,I2andI3inKCL.(6scores)Fig.1I1=1-3=-2A2I3=-=-1A4I2=-I3-1=1-1=062.ConsiderthecircuitshowninFig.2,assumingthatthediodesareideal.FindthevalueofI1andI2.(8scores)Fig.2由导通,截止得=0,=mA=5mA3.Considert
3、hecircuitshowninFig.3giventhatUS=9V,IS=3A,R1=3W,R2=6W.DeterminecurrentI1,I2insuperposition,whichelementsaresupplyingpower?(8scores)Fig.3IS单独作用时:I2'=1A2US单独作用时:4叠加得:I1=I1'+I1"=3AI2=I2'-I2"=0US是电源4.ConsiderthecircuitshowninFig.4giventhatUS1=10V,US2=20V,R1=R2=R3=R4=R5=2W.Determine
4、currentIinthevenintheorem.(10scores)Fig.44R0=R1//R2+R4//R5=2W7105.AsshowninfollowingcircuitFig.5,R1=60W,R2=120W,R3=40W,L=4H,,.theswitchShasbeenopenforalongtime,andthenclosedatt=0,pleasefindtheafterSisclosed.(10scores)Fig.52(叠加原理)46106.ConsiderthesinusoidalcircuitshowninFig.6giv
5、enthat:,R1=R2=1W,L=0.1mH,C=100mF.Determine:i(t),thepowerfactorandaveragepowerofthetotalcircuit.(10scores)Fig.6356Powerfactor:8Averagepower:kW107.Inthebalancedthree-phasesystemwitha380Vlinevoltageoffig.7givenZ=24+18jW.FindthelinecurrentofIaA,IaB,IaC,andplotphasordiagram.Assumeth
6、atthephaseofVabiszero(10scores)设:246因为:负载为三相对称负载所以:8相量图8.ConsiderthecircuitshowninFig.giventhat:R1=R2=R3RF1=RF2=RF3,findtherelationshipbetweenuoanduI.(scores10)由得故9.TransistorsareoperatingintheactiveregioninFig.9,assumethat:β=40,rπ=1kΩ,determine:(1)plotsmallsignalequivalentcirc
7、uit;(2)calculateinputresistorriandoutputresistorro;(3)voltagegainAu。(10scores).Fig.9(1)(2)(3)10.Considerthecommon-sourceamplifierillustratedinFigure10,(1)plotsmallsignalequivalentcircuit;(2)Computethevoltagegain,inputresistance,andoutputresistance.(10scores).Figure104Wedenoteth
8、eequivalentresistancebyTheoutputvoltageistheproductoft