第1題InatypicalapplicationcircuitofLM317,iftheinputvoltageis10V,theR1resistorissetto240Ω,andtheadjustableresistorR2issetto480Ω,thentheoutputvoltageofLM317is(

)V.A.1.25VB.2.5VC.3.75VD.10VA3.75VB1.25VC2.5VD10V第2題DCpowersupplyisanenergyconversioncircuitthatconvertsACenergyintoDCenergy.()第3題Voltagetransformationnotonlychangesthemagnitudeofthevoltage,butalsoconvertsalternatingcurrentintodirectcurrent.()第4題Inapointermultimeter,whenthemeasuredresistanceislow,theblackleadisconnectedtothepositivepoleofthediode,andtheredleadisconnectedtothenegativepoleofthediode.()第5題Theshellofthediodeisusuallymarkedwithpolaritycolordots(whiteorred).Generally,theendmarkedwithacolordotisthenegativeelectrode.()第6題Thehigh-powerbridgerectifiercircuitalsoaddsametalshellencapsulationoutsidetheinsulationlayertoenhanceaesthetics.()第7題Capacitorfilteringissuitableforcircuitswithlowcurrent,asthechargingcurrentishighandtherectifiertubebearsalargesurgecurrentwhenthepoweristurnedon.()第8題Threeterminalintegratedvoltageregulatorreferstoanintegratedcircuitusedforvoltageregulationthathasonlythreepinoutputs,namelytheinputterminal,outputterminal,andpowersupplyterminal.()第9題InathreeterminalDCvoltagestabilizingcircuit,theACmainspowerisconvertedintoDCpowerwithsmallchangesthroughrectificationandfilteringcircuits.InordertoobtainastableDCvoltage,athreeterminalintegratedvoltagestabilizerisrequired.()第10題Inavoltageregulatorcircuit,themaximumstablecurrentofthevoltageregulatormustbegreaterthanthemaximumloadcurrent.()第11題Inapplications,inordertoensurethestableoperationoftheLM317circuit,itisgenerallynecessarytoconnectatransistorasaprotectivecircuittopreventthehighvoltageduringcapacitordischargeinthecircuitfromburningouttheLM317.()第12題Duetotheintroductionofdeepnegativefeedbackintheseriesvoltagestabilizingcircuit,self-excitedoscillationmayalsooccur.()第13題Whentheoutputvoltageoftheintegratedvoltageregulatorisgreaterthan25Vorthefilteringcapacitorattheoutputendisgreaterthan25μF,thevoltageregulatorneedstobeexternallyconnectedwithaprotectivediodetopreventthedischargeofthefilteringcapacitorfromcausingdamagetotheintegratedvoltageregulator.()第14題Capacitorfilteringutilizesthecharginganddischargingcharacteristicsofcapacitors,whileinductancefilteringutilizesthecharacteristicsoflowDCresistanceandhighACimpedanceofinductors.()第15題TheripplecoefficientoftheDCpowersupplyrequiredforgeneralelectronicequipmentisrequiredtobelessthan0.05.()第16題ThefunctionofavoltagestabilizingcircuitistomaintainthestabilityoftheoutputDCvoltagewhentheACpowersupplyvoltagefluctuatesortheloadchanges.()第17題InDCregulatedpowersupply,thefunctionofthefilteringcircuitis()ATransformingpulsatingACvoltageintosmoothDCvoltageBConvertthepulsatingDCvoltagetoasmoothDCvoltage;CTransformingbidirectionalpulsatingvoltageintounidirectionalpulsatingvoltage;DTransformingpulsatingACvoltageintopulsatingDCvoltage第18題TheconductionvoltagedropoftheLEDis().A0.2-0.3VB0.5-0.7VC1VD1.7-3.5V第19題N-typeandP-typesemiconductorsutilizethe()propertiesofsemiconductors.APhotosensitivityBThermalsensitivityCMiscibilityDPoorconductivity第20題Thesecondaryvoltageofthetransformerinthebridgerectifiercircuitis20V,andthemaximumreversevoltagebornebyeachrectifierdiodeis(

).A28VB20VC40VD56V第21題Inthefilteringcircuit,theconductionangleoftherectifierdiodeislarge,thepeakcurrentissmall,andtheoutputcharacteristicsaregood.Thefilteringcircuitsuitableforlowvoltageandhighcurrentsituationsis().AInductanceBCapacitanceCDuplexDActive第22題ThepulsatingDCvoltageisfilteredandconvertedinto()voltage.AFilterDCvoltageBCorrugatedDCvoltageCStablerectificationvoltageDPulsatingDCvoltage第23題TheDCpowersupplycomposedofathreeterminalvoltageregulatorissequentiallycomposedof().ARectifiercircuit,filter,regulator,powertransformerBRectifiercircuit,powertransformer,voltageregulator,filterCPowertransformer,rectifiercircuit,filter,regulatorDPowertransformer,rectifiercircuit,voltageregulator,filter第24題Inathreeterminalregulatedpowersupplycircuitwithapositive15Vandanoutputcurrentof1A,thereasonableinputvoltageofthethreeterminalregulatoris().A10VB15VC18VD25V第25題ThereasonwhyswitchingDCpowersuppliesaremoreefficientthanlinearDCpowersuppliesis().ANopowertransformerneededBLCfilteringcircuitattheoutputendCAdjusttheoperationofthetubeintheon/offstate第26題IfyouwanttoformaDCregulatedpowersupplywithadjustableoutputvoltageandamaximumoutputcurrentof3A,youshoulduse()ACapacitorfilterregulatorcircuitBInductivefilterregulatorcircuitCCapacitorFilterSeriesStabilizerCircuitDInductivefilteringseriesvoltagestabilizingcircuit第27題Whichofthefollowingarenotthebasiccharacteristicsofsemiconductors()AThermalsensitivityBPhotosensitivityCHeterosensitivityDElectricalsensitivity第28題Theeffectivevalueofthetransformersecondaryvoltageinahalfwaverectifiercircuitis10V,theloadresistanceis500Ω,andtheaveragecurrentflowingthroughthediodeis()A180mAB90mAC9mAD18mA第29題WhichofthefollowingstatementsaboutLM317isincorrect()ALM317outputcurrentexceeds1.5ABLM317outputadjustablebetween2Vand37VCLM317internalthermaloverloadprotectionDLM317internalshortcircuitcurrentlimitationthatdoesnotvarywithtemperature第30題ThemaincharacteristicsofLEDare()ALowworkingvoltage,lowworkingcurrent,lowpowerconsumption,andlongservicelifeBHighworkingvoltage,lowworkingcurrent,lowpowerconsumption,andlongservicelifeCLowworkingvoltage,highworkingcurrent,lowpowerconsumption,andlongservicelifeDHighworkingvoltage,highworkingcurrent,lowpowerconsumption,andlongservicelife第1題Iftheintegratedoperationisplacedinthecaseofinvertinginput,thein-phaseendisgrounded,andtheinvertingendisalsocalledvirtualground.()第2題Activeloadcanincreasetheoutputcurrentoftheamplifiercircuit.()第3題Anidealdifferentialamplifiercircuitcanonlyamplifydifference-modesignals,notcommon-modesignals.()第4題IntegratedopampcanonlyamplifyDCsignal,notACsignal.()第5題Thelargerthedifferentialmodemagnificationofthedifferentialamplifiercircuit,thebetter,andthesmallerthecommonmodemagnification,thebetter.()第6題Theoutputvoltageofavoltagecomparatorhasonlytwovalues.()第7題Theinverseinputendoftheintegratedopampisavirtualsite,andthecurrentflowingthroughthefeedbackresistanceisequaltothealgebraicsumoftheinputcurrent.()第8題"Virtualshort"and"virtualbreak"meanthatinthelinearstate,theintegratedopamphasnoinput.()第9題Allintegratedoperationalampswithpositivefeedbackmustworkinthenonlinearregion.()第10題Inordertoincreasetheinputresistanceoftheamplifiercircuit,parallelnegativefeedbackshouldbeintroduced.()第11題Thetwostatesofthecomparatoroutputarehighandlow.()第12題Undernormalcircumstances,thelargerthecommonmodevoltageamplificationofthedifferentialcircuit,thebetter,andthesmallerthedifferentialmodevoltageamplification,thebetter.()第13題Indifferentialamplifiercircuits,activeloadsareoftenusedtoreplacetheemitterresistanceRe,sothatthecommon-moderejectionratioofdifferentialamplifiercircuitscanbeimproved.()第14題"Virtualground"meansequalpotentialbetweenthepointandthegroundpoint.()第15題Theidealdifferentialamplifiercircuitcanonlyamplifythedifferentialmodesignal,notthecommonmodesignal.()第16題Theinputstageofintegratedopamplifieradoptsdifferentialamplifiercircuitbecauseitcan()AIncreasemagnificationBIncreaseinputresistanceCReducedtemperaturedriftDAlloftheabovearetrue第17題Inthecommonlyusedvoltagecomparator,thezero-levelcomparatorisreferredtoas()AZerocrossingcomparatorBSinglelinecomparatorCSinglelinecomparatorDDoublelimitcomparator第18題Thelargerthecommon-moderejectionratiooftheintegratedoperationalamplifier,thecomponent()ADifferentialmodesignalamplificationincreasesBThestrongertheloadcapacityCThestrongertheabilitytoinhibitzerodriftDThefasterthedevicecools第19題Whenthetwoparametersofthesymmetricaltriodearecomposedofadifferentialcircuit,theamplificationratio()iscomparedwiththatofthesingle-tubecircuitwhenthetwo-terminalinputandtwo-terminaloutputareused.ATwicethesizeofBalikeCTwiceaslargeasDinvariability第20題Tosuperimposethesinewavevoltageonadirectflow,the()operationcircuitshouldbeselected.AscaleBAddandsubtractCpointsDdifferential第21題Thevirtualshortfeatureisessentiallyduetotheintegratedopamp()ATheinputresistanceisverylargeBTheoutputresistanceisverysmallCTheopenloopgainisverylargeDThecommon-moderejectionratioisverylarge第22題Toanalyzethevoltagecomparator,theanalysisbasisthatcanbeusedis()ATherearebrokenandshortBThereisnodeficiencyCThereisnodeficiencyordeficiencyDNodeficiencyisbrokenorshort第23題Thelargerthecommon-moderejectionratio,the()ofthecircuitisindicated.AThemorestablethemagnificationBThegreatertheACmagnificationCThegreatertheACmagnificationDThelargerthedifferentialmodecomponentinthesignal第24題Howtorationallyapplyintelligentsuntrackingcontrollerinphotovoltaicagriculturalweatherstation?()AConsidertheuser'sactualworkingenvironmentBImproveproductreliabilityCHuawei'squalitymanagementistheultimatepursuitof"zerodefects"andthespiritofgreatartisansDAlltheabove第25題Inordertosuppressthesignalbelow2KHz,()shouldbeused.ALow-passfiltercircuitBHigh-passfiltercircuitCBandpassfiltercircuitDBandresistancefilterresistor第26題Thedifferentialamplifiercircuit(whennotconnectedtotheload)changesfromadouble-endedoutputtoasingle-endedoutput,anditsdifferentialmodevoltageamplificationfactor()AdoubleBReducebyoneCRemainunchangedDIncreasebyhalf第27題Integratedopampmanufacturingprocessmakessimilarsemiconductortubes()AAccurateindexparametersBTheparameterisnotaffectedbytemperatureCGoodparameterconsistency第28題Twoimportantconclusionsoftheidealoperationalamplifiercircuitare()AVirtualandantiphaseBShortandemptyCDeficiencyshortanddeficiencybrokenDOpencircuitandshortcircuit第29題Thespecialcaseoftheproportionaloperationcircuitisthevoltagefollower,whichhasthecharacteristicsofalargeRiandasmallRo,andiscommonlyusedasabuffer.()AInvertingproportionBIn-phaseratioCadditionDsubtraction第30題Theelementsofphotovoltaicagriculturalweatherstationare()AlightBSunshinedurationCLightsaturationpointDAlltheabove第31題Thephysicalandmechanicalcharacteristicsofthefruitsignalhastheacquisitionsignal,theamplificationsignal,theprocessingsignal.()第32題Thebasicdifferentialamplifiercircuitiscomposedoftwoperfectlysymmetricalcommon-emissionamplifiercircuits.()第33題Common-modeinputvoltagerelationshipsexistofthesamemagnitudeandoppositepolarity.()第34題TheroleofREintheOTLcircuitanalysisdiagramisthatthegreatertheRE,thesmallerthetemperaturedriftoneachside,thestrongerthecommon-modenegativefeedback,thebettertheperformanceofthedifferentialamplifiercircuit()第35題Thetransmissiondirectionoftheforwardpathandthefeedbackpathisthesame()()第36題Theidentificationmethodofpositiveandnegativefeedbackisifthefeedbackandinputareatthesameendoftheamplifiercircuit,thesamepolarityispositivefeedback,andtheoppositepolarityisnegativefeedback().第37題Thevoltageandcurrentmagnificationofthepoweramplifieraregreaterthan1.()第38題InClassBcomplementarysymmetricpoweramplifiercircuit,thegreatertheinputsignal,thegreaterthecrossoverdistortion()第39題Inordertomakethepoweramplifieroutputalargeenoughpower,thegeneraltransistorshouldworkintheamplifiedstate.()第40題Powerobservationsignalsourceuiselectionfunctiongeneratoraccesssignalsource,adjusttheparametersignalamplituderangeof10uV~11mV.()第41題Youcanjudgetheinternalqualityoffruitbyitsappearance.()第42題Dcnegativefeedbackcanonlyaffecttheinputsignaloftheamplifier,andACnegativefeedbackcanonlyaffecttheACinputoftheamplifier.()第43題Thespecialdistortioncausedbypush-pullamplifiersiscalledcrossoverdistortion.()第44題Powerobservationsignalsourceuiselectionfunctiongeneratoraccesssignalsource,frequencybetween(1~99Hz).()第45題DebuggingandtroubleshootingcanaccuratelydeterminethefaultpointaccordingtotheInternetofThingsandtheplatformandthefaultdetectionprocess,soastoquicklyeliminatethefault.()第46題Thefollowingarenotcurrentsourcecircuits()ATriodecurrentsourceBProportionalcurrentsourceCSinglecurrentsourceDMirrorcurrentsource第47題Voltagefeedbackisintroducedintotheamplifiercircuit,andthefeedbacksignalistakenfrom()AInputvoltagesignalBOutputvoltagesignalCInputcurrentsignalDOutputcurrentsignal第48題Whatmakestheoutputvoltagestableis()negativefeedback.AvoltageBElectriccurrentCSeriesconnectionDInparallel第49題Communicationnegativefeedbackrefersto()ATheintroductionofnegativefeedbackinaresistance-capacitancecoupledamplifiercircuitBNegativefeedbackoccursonlywhentheACsignalisamplifiedCNegativefeedbackintheACchannelDNoneoftheaboveistrue第50題Whendrawingthesmallsignalequivalentcircuitofthetriodeamplifiercircuit,theDCvoltagesourceVCCshouldbe()Ashort-circuitBOpenawayCRemainunchangedDCurrentsourceChaptertesting第1題Thephysicalandmechanicalcharacteristicsofthefruitsignalhastheacquisitionsignal,theamplificationsignal,theprocessingsignal.()第2題Thebasicdifferentialamplifiercircuitiscomposedoftwoperfectlysymmetricalcommon-emissionamplifiercircuits.()第3題Common-modeinputvoltagerelationshipsexistofthesamemagnitudeandoppositepolarity.()第4題TheroleofREintheOTLcircuitanalysisdiagramisthatthegreatertheRE,thesmallerthetemperaturedriftoneachside,thestrongerthecommon-modenegativefeedback,thebettertheperformanceofthedifferentialamplifiercircuit()第5題Thetransmissiondirectionoftheforwardpathandthefeedbackpathisthesame()()第6題Theidentificationmethodofpositiveandnegativefeedbackisifthefeedbackandinputareatthesameendoftheamplifiercircuit,thesamepolarityispositivefeedback,andtheoppositepolarityisnegativefeedback().第7題Thevoltageandcurrentmagnificationofthepoweramplifieraregreaterthan1.()第8題InClassBcomplementarysymmetricpoweramplifiercircuit,thegreatertheinputsignal,thegreaterthecrossoverdistortion()第9題Inordertomakethepoweramplifieroutputalargeenoughpower,thegeneraltransistorshouldworkintheamplifiedstate.()第10題Powerobservationsignalsourceuiselectionfunctiongeneratoraccesssignalsource,adjusttheparametersignalamplituderangeof10uV~11mV.()第11題Youcanjudgetheinternalqualityoffruitbyitsappearance.()第12題Dcnegativefeedbackcanonlyaffecttheinputsignaloftheamplifier,andACnegativefeedbackcanonlyaffecttheACinputoftheamplifier.()第13題Thespecialdistortioncausedbypush-pullamplifiersiscalledcrossoverdistortion.()第14題Powerobservationsignalsourceuiselectionfunctiongeneratoraccesssignalsource,frequencybetween(1~99Hz).()第15題DebuggingandtroubleshootingcanaccuratelydeterminethefaultpointaccordingtotheInternetofThingsandtheplatformandthefaultdetectionprocess,soastoquicklyeliminatethefault.()第16題Themostappropriateadvanceddetectiontechnologyforfruitqualityis()APesticideresiduedetectorBSugardetectorCHardnesstesterDNondestructivetestinginstrument第17題Whatisthedifferentialamplifiercircuitsetupfor()AUStabilityUBAmplifiedsignalCSuppressedzerodriftDIncreaseinputresistance第18題Thefollowingarenotcurrentsourcecircuits()ATriodecurrentsourceBProportionalcurrentsourceCSinglecurrentsourceDMirrorcurrentsource第19題Comparisonofactiveloaddifferentialamplifierwithmirrorcurrentsourceandsingle-endoutputdifferentialamplifierwithordinaryresistanceasload()AThedifferentialmodevoltagegainoftheformerislargeBThelatterhaslargedifferentialmodegainCThecommonmodegainoftheformerislargeDThelatterhaslowcommon-modegain第20題Voltagefeedbackisintroducedintotheamplifiercircuit,andthefeedbacksignalistakenfrom()AInputvoltagesignalBOutputvoltagesignalCInputcurrentsignalDOutputcurrentsignal第21題Inthe0CLcircuit,thetwotransistorcharacteristicsandparametersarethesameandmustbe()ANPNandNPNtubeBPNPandPNPtubesCNPNandPNPtubesDuncertain第22題Whatcanreducetheinputresistanceis()feedback.AVoltageminusBCurrentnegativeCSeriesnegativeDShuntnegative第23題Whatmakestheoutputvoltagestableis()negativefeedback.AvoltageBElectriccurrentCSeriesconnectionDInparallel第24題Forvoltagenegativefeedbackrequirementsloadresistance()AAsbigaspossibleBAssmallaspossibleCGoodsizeDuncertain第25題Communicationnegativefeedbackrefersto()ATheintroductionofnegativefeedbackinaresistance-capacitancecoupledamplifiercircuitBNegativefeedbackoccursonlywhentheACsignalisamplifiedCNegativefeedbackintheACchannelDNoneoftheaboveistrue第26題Whendrawingthesmallsignalequivalentcircuitofthetriodeamplifiercircuit,theDCvoltagesourceVCCshouldbe()Ashort-circuitBOpenawayCRemainunchangedDCurrentsource第27題Themulti-stageamplifierisrequiredtohavelowinputresistanceandlowoutputresistance,and()negativefeedbackshouldbeintroducedbetweenthemulti-stageamplifiers.AVoltageparallelBVoltageseriesCCurrentparallelDCurrentseries第28題Complementarysymmetricalpoweramplifiercircuitfromtheperspectiveofamplification()AThereisbothvoltageamplificationandcurrentamplificationBOnlycurrentamplification,novoltageamplificationCOnlyvoltageamplification,nocurrentamplificationDuncertain第29題Multistageamplifiercircuitthansingle-poleamplifiercircuitpassband()AwideBnarrowCalikeDuncertainChaptertesting第1題Iftheintegratedoperationisplacedinthecaseofinvertinginput,thein-phaseendisgrounded,andtheinvertingendisalsocalledvirtualground.()第2題Activeloadcanincreasetheoutputcurrentoftheamplifiercircuit.()第3題Anidealdifferentialamplifiercircuitcanonlyamplifydifference-modesignals,notcommon-modesignals.()第4題IntegratedopampcanonlyamplifyDCsignal,notACsignal.()第5題Thelargerthedifferentialmodemagnificationofthedifferentialamplifiercircuit,thebetter,andthesmallerthecommonmodemagnification,thebetter.()第6題Theoutputvoltageofavoltagecomparatorhasonlytwovalues.()第7題Theinverseinputendoftheintegratedopampisavirtualsite,andthecurrentflowingthroughthefeedbackresistanceisequaltothealgebraicsumoftheinputcurrent.()第8題"Virtualshort"and"virtualbreak"meanthatinthelinearstate,theintegratedopamphasnoinput.()第9題Allintegratedoperationalampswithpositivefeedbackmustworkinthenonlinearregion.()第10題Inordertoincreasetheinputresistanceoftheamplifiercircuit,parallelnegativefeedbackshouldbeintroduced.()第11題Thetwostatesofthecomparatoroutputarehighandlow.()第12題Undernormalcircumstances,thelargerthecommonmodevoltageamplificationofthedifferentialcircuit,thebetter,andthesmallerthedifferentialmodevoltageamplification,thebetter.()第13題Indifferentialamplifiercircuits,activeloadsareoftenusedtoreplacetheemitterresistanceRe,sothatthecommon-moderejectionratioofdifferentialamplifiercircuitscanbeimproved.()第14題"Virtualground"meansequalpotentialbetweenthepointandthegroundpoint.()第15題Theidealdifferentialamplifiercircuitcanonlyamplifythedifferentialmodesignal,notthecommonmodesignal.()第16題Theinputstageofintegratedopamplifieradoptsdifferentialamplifiercircuitbecauseitcan()AIncreasemagnificationBIncreaseinputresistanceCReducedtemperaturedriftDAlloftheabovearetrue第17題Inthecommonlyusedvoltagecomparator,thezero-levelcomparatorisreferredtoas()AZerocrossingcomparatorBSinglelinecomparatorCSinglelinecomparatorDDoublelimitcomparator第18題Thelargerthecommon-moderejectionratiooftheintegratedoperationalamplifier,thecomponent()ADifferentialmodesignalamplificationincreasesBThestrongertheloadcapacityCThestrongertheabilitytoinhibitzerodriftDThefasterthedevicecools第19題Whenthetwoparametersofthesymmetricaltriodearecomposedofadifferentialcircuit,theamplificationratio()iscomparedwiththatofthesingle-tubecircuitwhenthetwo-terminalinput