MOOC Analog Electronics Technique-Huazhong University of Science and Technology 中国大学慕课答案

MOOCAnalogElectronicsTechnique-HuazhongUniversityofScienceandTechnology中国大学慕课答案TestquestionsforTheIdealOperationalAmplifier1、问题：Thetwoinputterminalsofanoperationalamplifierarelabeledas:选项：A、highandlowB、positiveandnegativeC、invertingandnoninvertingD、differentialandnondifferential正确答案:【invertingandnoninverting】2、问题：ForthecircuitintheFigure,theoutputvoltagevois().选项：A、-6VB、-5VC、-1VD、-0.2V正确答案:【-5V】3、问题：ForthecircuitinFigure,thecurrentixis()选项：A、0.6mAB、0.5mAC、0.2mAD、1/12mA正确答案:【0.5mA】4、问题：ForthecircuitinFigure,currentiois()选项：A、-10μAB、-2.5μAC、10/12μAD、10/14μA正确答案:【-10μA】5、问题：Ifvs=8mV,inthecircuitofFigure,theoutputvoltageis()选项：A、-44mVB、-8mVC、4mVD、7mV正确答案:【4mV】6、问题：Thepowerabsorbedbythe4kohmresistorinFigureis().选项：A、9mWB、4mWC、2mWD、1mW正确答案:【4mW】7、问题：ForthecircuitinFigure,theoutputvoltagev0is().选项：A、3VB、-3VC、-1VD、-2V正确答案:【-3V】8、问题：ForthecircuitinFigure,theoutputcurrentiois().选项：A、0.2mAB、-0.2mAC、0.1mAD、-0.1mA正确答案:【-0.2mA】9、问题：ForthecircuitinFigure,theoutputvoltagevois().选项：A、5VB、-5VC、3.75VD、-3.75V正确答案:【-5V】10、问题：ForthecircuitinFigure,theoutputvoltagevois()选项：A、5VB、-5VC、8VD、-8V正确答案:【-8V】11、问题：ForthecircuitinFigure,theoutputvoltagevois().选项：A、5VB、-5VC、3.8VD、-3.8V正确答案:【-3.8V】12、问题：Assumetheoperationalamplifiersareideal,iftheinputvoltageis+1V，Determinevo=().选项：A、1VB、-1VC、2VD、0V正确答案:【2V】13、问题：Assumetheoperationalamplifiersareideal,Determinevo=();选项：A、1VB、-1VC、2VD、0V正确答案:【0V】14、问题：ForthecircuitinFigure,theoutputvoltagevois()选项：A、150mVB、250mVC、350mVD、450mV正确答案:【350mV】15、问题：ForthecircuitinFigure,theoutputvoltagevois()选项：A、3.2VB、-0.8VC、2.4VD、1.2V正确答案:【2.4V】16、问题：ForthecircuitsshownasFigure,assumetheop-ampsisideal,andthemaximunoutputvoltageofalloftheop-ampsis±13V,whentimeist=0s,givetheinputvoltageisastepinvoltage,andtheamplitudeoftheinputis100mV,whentimeist=1s,determinetheoutputvoltageofeachop-ampis().选项：A、13VB、-13VC、0VD、100mV正确答案:【0V】17、问题：ForthecircuitintheFigure,theop-ampsareideal,theinputresistancesofthetwocircuitsare()选项：A、Ri1=Ri2=1kohmB、Ri1Ri2C、Ri1Ri2D、Ri1=Ri2=∞正确答案:【Ri1Ri2】18、问题：AssumealltheOp-Ampsareideal,determinevointermsofviis（）选项：A、vo=-0.5(vi+5)B、vo=0.5(vi+5)C、vo=2(vi+5)D、vo=-2(vi+5)正确答案:【vo=0.5(vi+5)】19、问题：Determinethevoltagetransferratiovo/vsinthisop-ampcircuit,whereR=10kohm.选项：A、-1/3B、-2/3C、1/3D、2/3正确答案:【-2/3】20、问题：AssumealltheOp-Ampsareideal,andwhentimet=0,thecapacitorvoltagevc=0,thenwhent=0,vo1=(),vo2=().选项：A、vo1=4V,vo2=1V;B、vo1=-4V,vo2=-1V;C、vo1=7V,vo2=1V;D、vo1=7V,vo2=-2V正确答案:【vo1=7V,vo2=-2V】21、问题：AssumealltheOp-Ampsareideal,andwhentimet=0,thecapacitorvoltagevc=0,thenwhent=(?)s,theoutputvoltagevo=0.选项：A、1B、1/70C、1/35D、2正确答案:【1/35】22、问题：Foranidealopamp,whichofthefollowingstatementsarenottrue?选项：A、ThedifferentialvoltageacrosstheinputterminalsiszeroB、Thecurrentintotheinputterminalsiszero.C、ThecurrentfromtheoutputterminaliszeroD、TheinputresistanceiszeroE、Theoutputresistanceiszero正确答案:【Thecurrentfromtheoutputterminaliszero#Theinputresistanceiszero】23、问题：Differenceamplifiersmaybeusedin().选项：A、instrumentationamplifiersB、voltagefollowersC、buffersD、summingamplifiersE、subtractingamplifiers正确答案:【instrumentationamplifiers#subtractingamplifiers】24、问题：Inthelinearoperationalamplifierscircuit,theinvertinginputoftheoperationalamplifierisvirtualground.选项：A、正确B、错误正确答案:【错误】25、问题：Thevoltagegainofthevoltagefolloweris1,soitcanbereplacedbyawire.选项：A、正确B、错误正确答案:【错误】26、问题：Inthecaseofopen-loop,theintegratedoperationalamplifiermustworkinthenon-linearregion.选项：A、正确B、错误正确答案:【正确】27、填空题：AssumealltheOp-Ampsareideal,determinevois（）V.正确答案:【5】TestquestionsforSemiconductorMaterialsandDiodesCircuits1、问题：Atroomtemperature,theconcentrationrelationshipbetweenfreeelectronsandholesinintrinsicsemiconductorsisasfollows（）选项：A、UndeterminedB、MorefreeelectronsC、MoreholesD、Same正确答案:【Same】2、问题：Whatarethemajoritycarriersinn-typematerials?选项：A、holesB、freeelectronsC、PositiveionsD、Negativeions正确答案:【freeelectrons】3、问题：Whataretheminoritycarriersinp-typematerials?选项：A、holesB、freeelectronsC、PositiveionsD、Negativeions正确答案:【freeelectrons】4、问题：AftertheformationofPNjunction,therelationshipbetweendiffusioncurrentanddriftcurrentisasfollows（）选项：A、MorediffusioncurrentB、MoredriftcurrentC、SameD、Undetermined正确答案:【Same】5、问题：WhenPNjunctionisreversebiased,theresistancebecomes（）选项：A、smallerB、largerC、UnchangedD、Undetermined正确答案:【larger】6、问题：WhenthePNjunctionisforwardbiased,thecurrentismainly（）选项：A、ReversedriftcurrentB、ForwarddiffusioncurrentC、ForwarddriftcurrentD、Reversediffusioncurrent正确答案:【Forwarddiffusioncurrent】7、问题：ForthecircuitshowninFigure，whenVγ=0.7V，thediodevoltageVDandthecurrentIDare（）选项：A、VD=0.7V,ID=1mAB、VD=0.5V,ID=1mAC、VD=0.5V,ID=0mAD、VD=0.7V,ID=0mA正确答案:【VD=0.5V,ID=0mA】8、问题：WhenthetempertureTincreases，theforwardvoltageofthePNjunction()选项：A、IncreaseB、DecreaseC、unchangedD、uncertain正确答案:【Decrease】9、问题：Theconcentrationofthemajoritycarriersintheextrinsicsemiconductorismainlyaffectedby().选项：A、TheconcentrationofimpurityB、ThetemperatureC、ThecrystaldefectD、Thedopingtechnology正确答案:【Theconcentrationofimpurity】10、问题：Theconcentrationoftheminoritycarriersintheextrinsicsemiconductorismainlyaffectedby()选项：A、TheconcentrationofimpurityB、ThetemperatureC、ThecrystaldefectD、Thedopingtechnology正确答案:【Thetemperature】11、问题：Thezenerdiodecircuitisshownasfigure,ifVI=10V，R=100ohm，VZ=5V，IZ(min)=5mA，IZ(max)=50mA,T、thenthereisitanceofRLshouldbe()选项：A、111ohmB、111ohmC、111kohmD、111kohm正确答案:【111ohm】12、问题：Thecircuitisshownasfigure,andVDD=2V，R=1kohm,vs=50sin(2pi*50t)mV，andVγ=0.7V,thenthequiescentcurrentofthediodeis(),thequiescentvoltageoftheoutputvOis(),andtheacvoltageamplitudeoftheoutputis().选项：A、2mA，2V；0.05VB、1.3mA，1.3V；0.05VC、2mA，2V；0.049VD、1.3mA，1.3V；0.049V正确答案:【1.3mA，1.3V；0.049V】13、问题：Thecircuitisshownasfigure,theinputvoltagesareshowninthetable,theoutputvoltageshouldbe()选项：A、aB、bC、cD、d正确答案:【b】14、问题：Thecircuitisshownasfigure,thediodesaresilicondiodes,whenvs=6sinwtV,pleaseusethecase1model(Vr=0.7V)toanalysisthecircuit,theoutputwaveformshouldbe()选项：A、aB、bC、cD、d正确答案:【b】15、问题：Thecircuitisshownasfigure,iftheRMSvalueoftheacsinesignalis220V,RL=0.1k,weusetheidealmodeltoanalysisthecircuit,thenthepeakinversevoltageofthediodeis().Themaximumrectifiedcurrentofthediodeis().选项：A、220V，0.99AB、220V，1.98AC、311V，1.98AD、311V，0.99A正确答案:【311V，0.99A】16、问题：Forthecircuitshownasfigure,ifweuseidealmodel,andtheamplitudeoftheacsinesignalis24V,thenthepeakcurrentofthediodeis(),andthepeakinversevoltageofthediodeis(）选项：A、240mA，24VB、120mA，12VC、120mA，36VD、360mA，36V正确答案:【120mA，36V】17、问题：Thecircuitisshownasfigure,thediodesaresilicondiodes,andVr=0.7V,thediodesD1andD2shouldbe().选项：A、D1on,D2on;B、D1on,D2offC、D1off,D2offD、D1off,D2on正确答案:【D1off,D2on】18、问题：Thecircuitisshownasfigure,theloadvoltageisVL=9V,aandtheinputvoltagemaybevarybetween11and13.6V,thecurrentoftheloadwillvaryfrom0to100mA,thethemaximumcurrentofthezenerdiodeis()选项：A、100mAB、200mAC、300mAD、400mA正确答案:【300mA】19、问题：Inordertoformn-typesemiconductors,Whatelementscanyouadd()选项：A、BB、CC、AlD、SiE、PF、GaG、GeH、As正确答案:【P#As】20、问题：Inordertoformp-typesemiconductors,Whatelementscanyouadd()选项：A、BB、CC、AlD、SiE、PF、GaG、GeH、As正确答案:【B#Al#Ga】21、问题：Fortheactualdiode,aslongasthepositivebiasvoltageisgreaterthanzero,thediodewillturnon.选项：A、正确B、错误正确答案:【错误】22、问题：Whenusingzenerdiodes,currentlimitingresistorsarenotrequired.选项：A、正确B、错误正确答案:【错误】23、问题：Forgeneraldiodes,LEDsandphotodiodes,forwardbiasvoltageisrequiredfornormaloperation.选项：A、正确B、错误正确答案:【错误】TestquestionsforTheField-EffectTransistor1、问题：Forap-channelEnhancement-ModeMOSFET,tocreateaninversionlayer,wemustaddwhatgatetosourcevoltageVGS?选项：A、PositiveB、NegativeC、ArbitraryD、Indeterminate正确答案:【Negative】2、问题：ThedraincurrentoftheMOSFETisformedbythe(）driftmovement?选项：A、majoritycarrierB、minoritycarrierC、twocarriersD、Indeterminate正确答案:【majoritycarrier】3、问题：ThedraincurrentoftheMOSFETiscontrolledbythe（）选项：A、thegatecurrentiGB、thegatetosourcevoltageVGSC、thedarintosourcevoltageVDSD、thegatetodrainvoltageVGD正确答案:【thegatetosourcevoltageVGS】4、问题：Thedraincurrentversusgate-to-sourcevoltagecharacteristicsisshowninFigure,theFETshouldbe().选项：A、Enhancement-modeNMOSFETB、Enhancement-modePMOSFETC、Depletion-modeNMOSFETD、Depletion-modePMOSFET正确答案:【Enhancement-modeNMOSFET】5、问题：ForthecircuitsshowninFigure,findwhichcircuitcanworkasanamplifier().选项：A、AB、BC、CD、D正确答案:【D】6、问题：Thedraincurrentversusgate-to-sourcevoltagecharacteristicsisshowninFigure，andfortheMOSFET,thevoltageofthethreeterminalsare:VS=-5V,VG=1V,VD=3V,theworkregionofthisMOSFETis().选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【saturation】7、问题：ThethresholdvoltageoftheMOSFETinthecircuitisVTN=1V,notconsiderthevoltagedropofthedrainresistor,DeterminetheworkregionoftheMOSFETinthecircuit.（）选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【saturation】8、问题：ThethresholdvoltageoftheMOSFETinthecircuitisVTP=-1V,notconsiderthevoltagedropofthedrainresistor,DeterminetheworkregionoftheMOSFETinthecircuit.()选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【cutoff】9、问题：InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;选项：A、VGSQ=1V,IDQ=1mA,VDSQ=3V;B、VGSQ=2V,IDQ=0.1mA,VDSQ=3V;C、VGSQ=1V,IDQ=0.1mA,VDSQ=3V;D、VGSQ=2V,IDQ=1mA,VDSQ=3V;正确答案:【VGSQ=2V,IDQ=0.1mA,VDSQ=3V;】10、问题：InthecircuitinFigure，theMOSFETworkedinwhichRegion?()选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【saturation】11、问题：InthecircuitinFigure，theMOSFETworkedinwhichRegion?()选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【nonsauration】12、问题：InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;选项：A、VGSQ=4V,IDQ=4mA,VDSQ=-2V;B、VGSQ=4V,IDQ=1mA,VDSQ=7V;C、VGSQ=3V,IDQ=1mA,VDSQ=6V;D、VGSQ=4V,IDQ=1mA,VDSQ=3V;正确答案:【VGSQ=3V,IDQ=1mA,VDSQ=6V;】13、问题：InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;选项：A、VGSQ=4V,IDQ=4mA,VDSQ=-2V;B、VGSQ=4V,IDQ=1mA,VDSQ=7V;C、VGSQ=3V,IDQ=1mA,VDSQ=6V;D、VGSQ=3V,IDQ=1mA,VDSQ=2.5V;正确答案:【VGSQ=3V,IDQ=1mA,VDSQ=2.5V;】14、问题：InthecircuitinFigure，theMOSFETworkedinwhichRegion?()选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【saturation】15、问题：InthecircuitinFigure，theMOSFETworkedinwhichRegion?()选项：A、cutoffB、saturationC、nonsaurationD、Indeterminate正确答案:【saturation】16、问题：InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;选项：A、VGSQ=2V,IDQ=2mA,VDSQ=2.8V;B、VGSQ=2.2V,IDQ=1mA,VDSQ=7.2V;C、VGSQ=2V,IDQ=2mA,VDSQ=6V;D、VGSQ=2.2V,IDQ=1mA,VDSQ=2.2V;正确答案:【VGSQ=2.2V,IDQ=1mA,VDSQ=7.2V;】17、问题：WhichMOSFETscanworkasamplifiersinthefollowingcircuits.选项：A、AB、BC、CD、DE、E正确答案:【B#D】18、问题：Thegatesourcevoltageandthedrainsourcevoltageareasfollows,andVTN,VTPorVPN,VPPvaluesarealsoknown.whichMOSFETsworkincutoffregion（）选项：A、VDS＝3V，VGS＝2V，VTN＝1VB、VDS＝3V，VGS＝1V，VTN＝1.5VC、VDS＝3V，VGS＝－1V，VPN＝－2VD、VDS＝－3V，VGS＝－2V，VTP＝－1VE、VDS＝3V，VGS＝－2V，VTP＝－1VF、VDS＝－3V，VGS＝－1V，VTP＝－1.5V正确答案:【VDS＝3V，VGS＝1V，VTN＝1.5V#VDS＝3V，VGS＝－2V，VTP＝－1V#VDS＝－3V，VGS＝－1V，VTP＝－1.5V】19、问题：Thegatesourcevoltageandthedrainsourcevoltageareasfollows,andVTN,VTPorVPN,VPPvaluesarealsoknown.whichMOSFETsworkinsaturationregion（）选项：A、VDS＝3V，VGS＝2V，VTN＝1VB、VDS＝3V，VGS＝1V，VTN＝1.5VC、VDS＝3V，VGS＝－1V，VPN＝－2VD、VDS＝－3V，VGS＝－2V，VTP＝－1VE、VDS＝3V，VGS＝－2V，VTP＝－1VF、VDS＝－3V，VGS＝－1V，VTP＝－1.5V正确答案:【VDS＝3V，VGS＝2V，VTN＝1V#VDS＝3V，VGS＝－1V，VPN＝－2V#VDS＝－3V，VGS＝－2V，VTP＝－1V】20、问题：Forn-channelandp-channelMOSFETs,thedrainsourcevoltageVDScanbepositiveornegativevalue.选项：A、正确B、错误正确答案:【错误】21、问题：Forn-channeldepletion-moseMOSFETs,thegatesourcevoltageVGSmustbepositiveinordertogettheMOSFETsworkinthesaturationregion.选项：A、正确B、错误正确答案:【错误】22、问题：Thethresholdvoltageofp-channelandn-channelenhancement-modeMOSFETsmustbepositive.选项：A、正确B、错误正确答案:【错误】TestquestionsforBasicFETAmplifiers1、问题：AssumingthatthecapacitorsinthecircuitareverylargeandcanberegardedasshortcircuittoACsignal,thesmallsignalequivalentcircuitis（）?选项：A、B、C、D、正确答案:【】2、问题：AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andthecircuitwiththelargestinputresistanceis（）.选项：A、B、C、D、E、正确答案:【】3、问题：AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuithasthelowestinputresistance（）选项：A、B、C、D、E、正确答案:【】4、问题：AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuithasthelowestoutputresistance（）选项：A、B、C、D、正确答案:【】5、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.ThegmofT1isgm=1mS.DeterminethevoltagegainofthecircuitAv=vo/vi=（）选项：A、3.3B、-3.3C、-10D、-0.77正确答案:【-3.3】6、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）选项：A、3B、-3C、6D、-6正确答案:【-3】7、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）选项：A、3B、-3C、1D、-1正确答案:【-1】8、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）选项：A、3B、-3C、6D、-6正确答案:【-6】9、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）.选项：A、6B、-6C、2D、-2正确答案:【-2】10、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）选项：A、3B、-3C、6D、-6正确答案:【-3】11、问题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）.选项：A、-0.89B、0.89C、10D、-10正确答案:【0.89】12、问题：AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuitshaveoutputandinputsignalsinphase（）选项：A、B、C、D、E、正确答案:【#】13、问题：AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuitshaveoutputandinputsignalsoppositephase（）选项：A、B、C、D、E、正确答案:【##】14、问题：Inthemultistageamplifiercircuit,theinputresistanceistheinputresistanceofthefirststage,andtheoutputresistanceoftheamplifiercircuitisequaltotheoutputresistanceofthelaststage(outputstage).选项：A、正确B、错误正确答案:【正确】15、问题：Becausethevoltagegainofcommondrainamplifiercircuitislessthan1,itcannotbeusedintheamplifiercircuit选项：A、正确B、错误正确答案:【错误】16、问题：Becausethestructuresofn-channelenhancementMOSFETandp-channelenhancementMOSFETaredifferent,theDCbiasofamplifiercircuitisdifferent,andthesmallmodelusedinACanalysisisalsodifferent.选项：A、正确B、错误正确答案:【错误】17、问题：Thefieldeffecttransistor(FET)worksinthesaturationregionandcanbeusedasanamplifier.TheACamplificationperformanceisindependentoftheDCoperatingpoint.选项：A、正确B、错误正确答案:【错误】18、问题：ThethresholdvoltageandtransconductanceofenhancementMOSFETareconstant.选项：A、正确B、错误正确答案:【错误】19、填空题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.ThegmofT1isgm=1mS.Determinetheinputresistanceis（）kohm.正确答案:【2075】20、填空题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheoutputresistanceis()ohm.正确答案:【500】21、填空题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheinputresistanceis()ohm.正确答案:【1000】22、填空题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethesourcevoltagegainofthecircuitAv=vo/vs=().正确答案:【5】23、填空题：Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheoutputresistanceis()kohm.正确答案:【10】TestquestionsforTheBipolarJunctionTransistor1、问题：WhenaBJTtransistorisusedasanamplifyingdevice,thebase-emitterjunctionis()biased,andthebase-collectorjunctionis()biased.选项：A、Forward，forwardB、Reverse,reverseC、Forward,reverseD、Reverse,forward正确答案:【Forward,reverse】2、问题：FortheimpuritydopingconcentrationsinthethreeregionsoftheBJT,whichregionisthehighest()选项：A、baseB、emitterC、collectD、unidentified正确答案:【emitter】3、问题：WhenaBJTtransistorworkedinsaturationregion,thebase-emitterjunctionis()biased,andthebase-collectorjunctionis()biased.选项：A、Forward，forwardB、Reverse,reverseC、Forward,reverseD、Reverse,forward正确答案:【Forward，forward】4、问题：Atransistorisbiasedintheforward-activemode,thecurrentofthethreeterminalsareI1=–1.2mA,I2=–0.03mA,I3=1.23mA，whichoftheseistheemitterterminal()，andwhichoftheseisthebaseterminal()选项：A、1，2B、2，3C、3,2D、3,1正确答案:【3,2】5、问题：InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesinforward-activemode()选项：A、VC=6V,VB=0.7V,VE=0VB、VC=6V,VB=6V,VE=5.4VC、VC=6V,VB=4V,VE=3.6VD、VC=3.6V,VB=4V,VE=3.4V正确答案:【VC=6V,VB=0.7V,VE=0V】6、问题：InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesincutoffregion()（Forsilicontransistor，wethinkVBE（th）=0.5V）选项：A、VC=6V,VB=0.7V,VE=0VB、VC=6V,VB=6V,VE=5.4VC、VC=6V,VB=4V,VE=3.6VD、VC=3.6V,VB=4V,VE=3.4V正确答案:【VC=6V,VB=4V,VE=3.6V】7、问题：Intheamplificationcircuit,theBJTisworkedinforward-activeregion,andthevoltageofeachterminalsisV1=2V,V2=6VandV3=2.7V,forthethreeterminals,whichistheemitter(),thetypeofthistransistoris().选项：A、3,NPNB、2,PNPC、1,NPND、1,PNP正确答案:【1,NPN】8、问题：ForthecircuitshowninFigure,whichregiondoesthetransistorworkin()选项：A、Forward-activeregionB、SaturationregionC、CutoffregionD、unidentified正确答案:【Saturationregion】9、问题：ForthecircuitshowninFigure,whichregiondoesthetransistorworkin()选项：A、Forward-activeregionB、SaturationregionC、CutoffregionD、unidentified正确答案:【Forward-activeregion】10、问题：ForthecircuitshowninFigure,whichregiondoesthetransistorworkin()选项：A、Forward-activeregionB、SaturationregionC、CutoffregionD、unidentified正确答案:【Forward-activeregion】11、问题：ForthecircuitshowninFigure,iftheinputsignalisagoodsinusoidalsignal,buttheoutputwaveformisintheFigure16,sothisiswhichdistortion()选项：A、nodistortionB、SaturationregionC、CutoffregionD、unidentified正确答案:【Saturationregion】12、问题：Atransistorisbiasedintheforward-activemode,thecurrentofthethreeterminalsareI1=–1.2mA,I2=–0.03mA,I3=1.23mA，thecurrentgainβis()选项：A、30B、40C、50D、60正确答案:【40】13、问题：InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesinsaturationregion()选项：A、VC=6V,VB=0.7V,VE=0VB、VC=6V,VB=6V,VE=5.4VC、VC=6V,VB=4V,VE=3.6VD、VC=3.6V,VB=4V,VE=3.4V正确答案:【VC=6V,VB=6V,VE=5.4V#VC=3.6V,VB=4V,VE=3.4V】14、问题：ForthecircuitshowninFigure,iftheinputsignalisagoodsinusoidalsignal,buttheoutputwaveformisintheFigure,sowhatmeasurescanbetakentoeliminatesuchdistortion()选项：A、increaseVCCamplitudeB、reducetheamplitudeofsignalsourceC、reducethevalueofloadresistanceRLD、opentheload正确答案:【increaseVCCamplitude#reducetheamplitudeofsignalsource#reducethevalueofloadresistanceRL】15、问题：IftheemitterandcollectorofBJTtransistorareexchanged,theamplifiercanstillbeconstructed.选项：A、正确B、错误正确答案:【错误】16、问题：WhenNPNtransistorworksintheforwardactiveregion,generallyweaddedpositivepowersupply,butforPNPtransistor,wemustaddnegativepowersupply.选项：A、正确B、错误正确答案:【错误】17、填空题：ForthecircuitshowninFigure,theoperationalamplifierisassumedtobeideal,forthetransistorVBE=VB-VE=0.7V,ifthereadingofthevoltmeteris200mV,thenthecurrentgainβofthetransistoris()正确答案:【50】TestquestionsforBasicBJTAmplifiers1、问题：ForthecircuitshowninFigure,determinethesmallsignalhybrid-πresistancerπis()andthevoltagegainis（）选项：A、2.6kohm,200B、2.6kohm,-200C、2.6ohm,200000D、2.6ohm,-200000正确答案:【2.6kohm,-200】2、问题：ForallofthecircuitsshowninFigure,whichcircuitcanamplifyACsmallsignal()选项：A、(a)B、(b)C、(c)D、(d)正确答案:【(b)】3、问题：ForthecircuitshowninFigure,whichpositionistheswitchinA,B,C?thetransistorcanworkintheforwardactiveregion()选项：A、AB、BC、CD、Unabletodetermine正确答案:【B】4、问题：ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichoutputwaveformiscorrect()选项：A、B、C、D、正确答案:【】5、问题：ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichoutputwaveformiscorrect()选项：A、B、C、D、正确答案:【】6、问题：Ifthesourceresistanceofthesignalsourceis1kohm，andwhentheamplifyingcircuitisnotconnected,thevoltageamplitudeofthesignalsourceis10mV，butwhentheamplifyingcircuitisconnected,thevoltageoftheinputportoftheamplifyingcircuitis8mV，thentheinputresistanceoftheamplifyingcircuitis()kohm.选项：A、5B、4C、2D、1E、0.5正确答案:【4】7、问题：Fortheamplifier,whentheloadisopen,theoutputvoltageis4V,andwhenthe3kohmloadresistorisconnected,theoutputvoltageis3V,thentheoutputresistanceoftheamplificationcircuitis()kohm.选项：A、5B、4C、2D、1正确答案:【1】8、问题：Fortheamplifier,whentheinputsignalis10pAcurrentandtheoutputis500mVvoltage,theinputresistanceofthisamplifierisbetterifitislargerorsmaller,andthetheoutputresistanceofthisamplifierisbetterifitislargerorsmaller()选项：A、smaller,largerB、smaller,smallerC、larger,largerD、larger,smaller正确答案:【smaller,smaller】9、问题：ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()kohm.选项：A、145,300,1B、-145,0.69,2C、290,0.69,2D、-145,0.69,1正确答案:【-145,0.69,2】10、问题：ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()kohm.选项：A、87,1.55,3B、-87,1.55,3C、174,1.55,1.5D、-174,1.55,1.5正确答案:【-87,1.55,3】11、问题：ForthecircuitshowninFigure，whenthe50uFcapacitorisopen,thethevoltagegainiswill()andtheinputresistancewill(),outputresisdtancewill().选项：A、increase,decrease,unchangedB、decrease,increase,unchangedC、decrease,decrease,decreaseD、increase,increase,increase正确答案:【decrease,increase,unchanged】12、问题：ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.选项：A、0.99,87.2,5.1kB、0.99,87.2,33C、0.99,260,2.55kD、99,87.2,2.55k正确答案:【0.99,87.2,33】13、问题：ForthecircuitshowninFigure，whentheouputvoltageisVo1,thesourcevoltagegainVo1/vsis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.选项：A、0.79,82,2kB、-0.79,8.2,2kC、0.8,82,31D、-0.8,8.2,1k正确答案:【-0.79,8.2,2k】14、问题：ForthecircuitshowninFigure，whentheouputvoltageisVo2,thesourcevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.选项：A、0.79,82,2kB、-0.79,8.2,2kC、0.8,8.2,31D、-0.8,8.2,1k正确答案:【0.8,8.2,31】15、问题：ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.选项：A、-291,2.574,7.5kB、291,25,7.5kC、-291,0.025,7.5kD、291,0.025,7.5k正确答案:【291,0.025,7.5k】16、问题：Inthefollowingcircuits,whichcircuithastheleastinputresistance()选项：A、B、C、D、正确答案:【】17、问题：Inthefollowingcircuits,whichcircuithastheleastoutputresistance.()选项：A、B、C、D、正确答案:【】18、问题：Inthefollowingcircuits,whichcircuithasthelargestabsolutegain.()选项：A、B、C、D、正确答案:【】19、问题：ForthecircuitshowninFigure,iftheDCvoltageVCE≈VCC,whatmaybewrongwiththecircuit?选项：A、ThecapacitorCb1isshortB、TheresistorRbisopenC、TheresistorRCisshortD、TheresistorRbisshortE、TheresistorRCisopen正确答案:【ThecapacitorCb1isshort#TheresistorRbisopen#TheresistorRCisshort】20、问题：ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichsmallsignalequivalentcircuitiscorrect()选项：A、B、C、D、E、F、正确答案:【#】21、问题：WhichofthefollowingamplifyingcircuitsmayamplifythesignalACvoltage()选项：A、CEB、CCC、CBD、CSE、CDF、CG正确答案:【CE#CB#CS#CG】22、问题：WhichofthefollowingamplifyingcircuitsmayamplifythesignalACcurrent()选项：A、CEB、CCC、CBD、CGE、CDF、CS正确答案:【CE#CC】23、问题：Inthefollowingcircuits,whichcircuitshaveoutputvoltageandinputvoltageinphase.()选项：A、B、C、D、正确答案:【##】24、问题：Inthefollowingcircuits,whichcircuitshaveinverseoutputandinputvoltages.()选项：A、B、C、D、E、正确答案:【#】25、问题：WhenaBJTtransistorisbiasedintheforward-activemode,theniC=β*iB,sowecanthinkoftransistorsasalwayslineardevices.选项：A、正确B、错误正确答案:【错误】26、问题：UsetheBJT,wecanmagnifyaninputsmallsignaltoalargeoutputsignal,wedon'tneedDCpowersupply.选项：A、正确B、错误正确答案:【错误】27、问题：Aslongasthetransistorworksintheforwardactiveregion,nomatterhowlargetheinputsignalis,linearamplificationcanberealized.选项：A、正确B、错误正确答案:【错误】28、问题：BecauseofthedifferentstructureofNPNandPNP,theDCbiasingisdifferentwhentheyworkinforwardactiveregion,sothesmallsignalmodelisdifferent选项：A、正确B、错误正确答案:【错误】29、问题：Thecapacitorcanbeopenfordc,andcanbeshortforanysignalfrequency.选项：A、正确B、错误正确答案:【错误】30、问题：Theindependentsourcecanalwaysbecomeashortcircuitforacanalysis.选项：A、正确B、错误正确答案:【错误】31、问题：FortheBJT,whentheEarlyvoltageVAisnotinfinite，we’redealingwithsmall-signa