雨课堂学堂在线学堂云《Electrical and Electronic Technology（广西城市建设学校）》单元测试考核答案

第1题InaDCcircuit,ifthereisanormalworkingcurrent,theworkingstateofthecircuitis().AOpencircuitBPathwayCShortcircuitDArbitrarystate第2题Amongthefollowingequipment,thepowersupplyis().AWashingmachineBRefrigeratorCStorageBatteryDIncandescentlamps第3题Thevoltageatbothendsofaconductoris12V,andthecurrentthroughitis1A,andwhenthevoltageatbothendsdropsto6V,thecurrentthroughtheconductorshouldbe().A0.5AB1AC1.5AD2A第4题When6Visaddedtobothendsofacertainsectionofwire,thecurrentthroughitis0.2A,andifthevoltageatbothendsofitischangedto2V,itsresistancevalueis().A10ΩB20ΩC30ΩD40Ω第5题Whenastudentusesaflashlight,hefindsthatthesmalllightbulbisnotlit,andbeforetheprogressofmaintenance,hehasmadethefollowingjudgmentsonthedirectcauseofthephenomenon,amongwhichitisimpossibleto().AThefilamentofthesmallbulbisbrokenBThevoltageatbothendsofthebatteryistoolowCSmallbulbisinpoorcontactDThereisashortcircuitattheswitch第6题Regardingtheformationoftheelectriccurrentandthedirectionoftheelectriccurrent,thefollowingstatementiscorrect().AThemovementofthechargeformsanelectriccurrentBThedirectionalmovementofthenegativechargecannotformanelectriccurrentCThedirectionofpositivechargedirectionalmovementisthedirectionofcurrentDThedirectionofthedirectionalmovementoffreeelectronsisthedirectionofthecurrent第7题FortheunderstandingofOhm'slawformulaD,whichofthefollowingsentencesiswrong().AForacertainsectionoftheconductor,thecurrentintheconductorisproportionaltothevoltageatbothendsoftheconductorBUnderthesamevoltage,thecurrentindifferentconductorsisinverselyproportionaltotheresistanceCThecurrentintheconductorisrelatedbothtothevoltageatbothendsoftheconductorandtheresistanceoftheconductorDBecauseresistanceisapropertyoftheconductoritself,thecurrentintheconductorisonlyrelatedtothevoltageatbothendsoftheconductor,nottotheresistanceoftheconductor第1题Thecommonlyusedlow-voltageelectroscopeistheelectrictester,alsoknownastheelectrictester,andthedetectionvoltagerangeisgenerally().A0-10VB0-36VC60-500VD50-1000V第2题Checkbeforeusingthemegger:thepointerpointstothe"0"scaleduringtheshortcircuittest,andthepointerpointstothemeggeratthe()scaleduringtheopencircuittest,soastoaccuratelymeasuretheinsulationresistanceoftheequipment.A0B50C100D∞第3题Themegohmmeteriscommonlyknownasthemeggerandcanbeusedtomeasurethe()ofthedevice.ADCvoltageBACvoltageCInsulationresistanceDDCcurrent第4题ThecommonlyusedelectricalinstrumentsthatcanmeasureDCvoltage,DCcurrent,ACvoltage,ACcurrent,andresistanceare().AMegohmmeterBMeggerCMultimeterDPressuregauge第5题Whenmeasuringresistancewithadigitalmultimeter,insert()intothecomhole.ARedprobeBBlackprobeCRedorblackprobeisacceptableProject3Assignment第1题Theintensityofthecurrentpassingthroughthehumanbodyatthetimeofelectricshockdependson().AElectrocutionvoltageBHumanbodyresistanceCElectrocutionvoltageandhumanbodyresistance第2题Ifthepersonwhohasbeenelectrocutedisunconsciousandbreathing,buthishearthasstoppedbeating,()firstaidmethodshouldbeused.ASupinearmholdingmethodBExternalchestcompressionmethodCPronebackpressDMouth-to-mouthbreathing第3题Thecommontype()ofelectricshockis/are().ASingle-phaseelectricshockBTwo-phaseelectricshockCStepvoltageelectricshockDAlloftheabove第4题Whenwearinginsulatedglovesforoperation,thecuffsofthejacketshouldbe().AInsertedintotheinsulatingglovesBRolledupCPlacedoutsidethegloves第5题Whenthecurrentpassingthroughthehumanbodyexceeds(),itwillbeelectrocuted.A30mAB50mAC100mA第6题Whenacertainpowerlineisgrounded,thecloseritistothegroundingpoint,thestepvoltageis().ANochangeBLowerCHigher第7题Electricalequipmentwithoutexperienceofelectricityshallberegardedas().AIfthereiselectricity,itisnotallowedtobetouchedbyhandBNoelectricity,canbereachedbyhandCNodangerousvoltage第8题Firstaidforelectricshockmustbeoftheessence,andpatientswithcardiacandrespiratoryarrestshouldbeimmediatelygivenfirstaidwith().AArtificialrespirationBCardiopulmonaryresuscitationCChestcompressionsDMedicalDevices第9题Whenmouth-to-mouthrescuerespirationisperformed,itisperformedapproximatelyeveryminute().A1-2timesB3-5timesCMorethan10timesD60-80times第10题Chestheartcompressionisperformedabouteveryminute()duringresuscitation.A3-5timesB10-20timesC30-40timesD60-80times第11题Thevastmajorityofelectricshockaccidentsarecausedby()personalinjuryordeath.AThehumanbodyreceivesanelectriccurrentandissubjectedtoanelectricshockBBurnCElectroconvulsive第12题Ifthepersonisseriouslyinjuredandhasstoppedbreathingorthehearthasstoppedbeating,()andchestheartsqueezeshouldbeperformedwithallefforts.AMassageBPointCArtificialrespiration第13题Therearewaystodisconnecttheelectrocutedpersonfromthepowersupply().APullBCutCPickDDragECushion正确答案：ABCDE第14题Theprincipleofon-siterescueis().AQuicklyBInsituCAccurateDPersistent正确答案：ABCD第15题Thetypesofelectricshockinclude().AElectricshock.BElectricinjury.CResistance.DCapacitance正确答案：AB第16题Electricalinjuryis()traumaticinjurycausedbypassingthroughthehumanbodyACurrentBVoltageCResistanceProject4Assignment第1题Theworkingstateoftheelectricalequipmentattheratedpoweris().AFullyloadedBLightloadCOverloadDLoad第2题Partoftheentrancelineisoutdoorsandpartisindoors,soitisnotallowedtobeused().AInsulatedwiresBRubberwireCBarewiresDStrandedwire第3题Theunitofelectricalenergyis().AVoltsBJoulesCAmpsDWatt第4题Low-voltageapplianceswithshort-circuitprotectionare().ALow-voltagefuseBACcontactorCSingle-phasewatt-hourmeterDDCrelay第5题Thethree-prongsocketiswiredaccordingto().ALeftfireandrightzeroaregroundedBLeftzeroandrightfiregroundingCLeftzeroandrightgroundingunderfireDLeftzerorightgroundingunderfire第6题Electricalpowerisusuallymeasuredusing().AVoltmeterBAmmeterCMultimeterDPowermeterProject5Assignment第1题Itiscustomarytorefertovoltagesbelow()aslowvoltage,andvoltagesabove()ashighvoltage.()A1kV1kVB2kV2kVC5kV5kVD10kV10kV第2题Iftheinterruptionofpowersupplywillcausegreaterlossespoliticallyandeconomically,thepowersupplyequipmentshouldbeused().APrimaryloadBSecondaryloadCTertiaryloadDFour-stageload第3题ThecolorsofthephaselineL1,L2andL3arerespectively()AYellow,red,greenBYellow,green,redCGreen,yellow,redDYellow,green,blue第4题Inthelow-voltagepowersupplysystem(mains220V),()powersupplyisoftenusedAThree-phasesix-wiresystemBThree-phasethree-wiresystemCThree-phasefive-wiresystemDThree-phasefour-wiresystem第5题Thepowersupplyvoltageweusuallytalkaboutis220V,whichmeans()ALinevoltageBHighvoltageCPhasevoltageDLinevoltageorphasevoltage第6题Thefireresistancegradeofthedistributionroombuildingshouldnotbelowerthan()ALevel1BLevel2CLevel3DLevel4第7题Generalratedleakageactioncurrent()A≤30mAB≤40mAC≤50mAD≤20mA第8题Softbusisgenerallyusedin()powerdistributiondevicesALowpressureBHighpressureCHighandlowpressureD35KVandabovehighvoltage第9题Wireswithoutouterinsulationarecalled()AInsulatedwiresBBarewiresCCoppercorewiresDAluminumcorewires第10题Thefollowingstatementsarefalse()AThefunctionofthecableinsulationlayeristoinsulatethecablecoreandtheconductorandbetweenthecablecoreandtheprotectivelayerBAluminumcorewirehasbetterconductivityandhighmechanicalstrengththancoppercorewireCTheprotectivelayerisfurtherdividedintotheinnersheathandtheoutersheath.TheinnersheathprotectstheinsulationfrommoistureandpreventstheoutflowofthecableimpregnatingagentDThemodelnumberofthepowercableconsistsoflettersandnumbersProject6Assignment第1题Whatfactorsarerelatedtothespeedofthree-phaseasynchronousmotor?()APowerfrequencyBNumberofmagneticpolepairsCSliprateDRotorresistance第2题Whatistheratedpowerofthree-phaseasynchronousmotor?()AInputpowerBOutputpowerCTotalpowerDAdditionalpower第3题Howmanytimesisthestartingcurrentofthethree-phaseasynchronousmotorcomparedtotheratedcurrent?()A2~3timesB3~4timesC4~5timesD5~6times第4题Whatarethestartingmethodsofthree-phaseasynchronousmotor?ADirectstartandbuckstartBIndirectandcontinuousstartsCDirectstartandstep-downstart,star-deltastart,autotransformerstartDContinuousandstar-deltastart-up,autotransformerstart-up,capacitorstart-up第5题Whathappenswhenthethree-phaseasynchronousmotorsuddenlybreaksoffonephaseduringoperation?()AThemotorstopsrunningBThemotorsoundsabnormallyandburnsoutthewindingsCThemotorvibratesviolentlyandburnsoutthewindingsDThemotorcancontinuetorun,butataslowerspeed第6题Whatarethecontentsofthemaintenanceofthree-phaseasynchronousmotor?()ARegularlyinspectthemotorwindings,bearings,couplings,etc.forabnormalsoundorlooseningBRegularlycheckthegroundingofthemotor,thelubricationofthebearingsandtheoperationofthecoolingsystemCRegularlycheckthemaintenanceandlubricationofmotortransmissionpartsDAlloftheabove第7题Howtodealwithabnormalsoundorvibrationduringtheoperationofthethree-phaseasynchronousmotor?()AImmediatelycutoffthepowersupplyandreporttotheleaderforprocessingBDealwithitaccordingtothespecificsituation,andaskprofessionalandtechnicalpersonneltoinspectitifnecessaryCAskprofessionaltechnicianstooverhaulandfindoutthecausefortreatmentDNoneoftheabove第8题Theratedpowerofthethree-phaseasynchronousmotoris()W.A100B1000C10000D100000第9题Thedirectionofrotationofathree-phaseasynchronousmotorisrelatedto().AThemagnitudeofthepowersupplyvoltageBThefrequencyofthepowersupplyCPowerphasesequenceDThesizeoftheload第10题Therotationalspeedofthethree-phaseasynchronousmotorisrelatedto().AThemagnitudeofthepowersupplyvoltageBThefrequencyofthepowersupplyCNumberofpolepairsDThesizeoftheloadProject7Assignment第1题Theelectricalcontrolsystemdiagramcommonlyusedinrealproductionis().AElectricalschematicBWiringdiagramofelectricalinstallationCLayoutofelectricalcomponentsDAllthreeoftheabove第2题TheelectricalwordsymbolSB,whichrepresentsthelow-voltageelectricalapplianceis().ALowvoltageresistorBButtonswitchCFuseDLow-voltagecircuitbreaker第3题ElectricalappliancesthatworkatACvoltage1200VandDCvoltagebelow1500Varecalled().AHighvoltageelectricalappliancesBLow-voltageelectricalappliancesCMediumvoltageappliancesDZero-voltageappliances第4题()isadevicethatconvertselectricalenergyintomechanicalenergy.AElectricmotorBGeneratorCTransformerDEnergymeter第5题ThermalrelayFRplaystheroleof()inthecircuit.AOverloadprotectionBShortcircuitprotectionCCircuitbreakerprotectionDLowtemperatureprotection第6题Inthejogcontrolcircuit,thefirstgroupofthreefusesplaystheroleof()inthecircuit.AMotoroverloadprotectionBMaincircuitshortcircuitprotectionCAuxiliarycircuitshortcircuitprotectionDContactoroverloadprotection第7题Three-phaseasynchronouselectricforwardrotationself-lockingcircuitcontains().ATimecontactorBDCcontactorCACcontactorDTravelswitch第8题ThephenomenonthattheACcontactorcoilisalwaysinanenergizedstatethroughitsownnormallyopenauxiliarycontactiscalled().ASelf-lockingBShutdownCClosureDInterlockProject8Assignment第1题Fromthepointofviewofthepathofthecurrentflowingthroughthehumanbodyatthetimeofelectricshock,themostdangerouspathofelectricshockis().AHands~FeetBAnteriorchest~RighthandCAnteriorchest~LefthandDTwofingers第2题Whenartificialrespirationisusedtorescuethecasualtywhohasstoppedbreathing,ifthecasualtyisfoundtohaveawoundonthechestorback,thefirstaidmethod()shouldbeused.AMouth-to-mouthblowingBSu