雨课堂学堂在线学堂云《Analysis and Application of Electronic Circuits in Smart Agriculture（重庆三峡职业学院）》单元测试考核答案

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

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

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