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