电工技能鉴定考核试题库精选 初级.docx
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电工技能鉴定考核试题库精选 初级.docx
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电工技能鉴定考核试题库精选初级
电工技能鉴定考核试题库(精选)初级
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First,therightandwrong
1、indicatinginstrumentcannotonlymeasuretheelectromagneticquantitydirectly,butalsocooperatewithvarioussensorstomeasurethenonelectricquantityoftemperature,pressureandflow.(V)
2、theelectricmetercandoboththedirectcurrent,thedirectcurrentandthehigheraccuracyammeter,voltmeter,andalsocandothesuccessratetable,frequencymeterandphasetable.(V)
3,theaccuracyis1.5meters,thebasicerrorofmeasurementis+3%.(x)
4,weshoulddirectlymeasuretheaveragevalueofthecurrentinthecircuit,wecanchoosetheelectromagneticsysteminstrument.(x)
5、theadditionalresistanceofthevoltmetercannotonlyextendtherangeoftemperature,butalsoplaytheroleoftemperaturecompensation.(V)
6,thevoltagetransformertwowindingisnotallowedtoopencircuit,currenttransformertwowindingshortcircuitisnotallowed.(x)
7.DCammetercanbeusedinACcircuit.(x)
8,canbemadenotonlyonammetercanmeasureACcurrent,DCcurrentcanbemeasured.(V)
9,useamultimetertomeasureresistance,everychangetothepointerohmfilesatransferorder.(V)
10,measuringACcircuitandactivepower,becauseitisalternatingcurrent,soitsvoltagecoil,currentcoilandtwoendscanbearbitrarilyconnectedtotheroad.(x)
11,withtwosingle-phasepowermetermeasuringthree-phasethreewireactiveloadpower,thereisatablereversal,thismustbewiringerror.(x)
12,thepowersystemofthecurrentcoilcoilcounter,willleadtocounterdeflectionoftheneedle,butifthevoltagecoilisalsoreverse,youcanoperatenormally.(x)
13、electromagneticsysteminstrument'sabilitytoresistexternalmagneticfieldinterferenceisstrongerthanmagnetoelectricinstrument.(x)
14,Departmentofelectricmeterphasedidnotproducereactiontorqueofthehairspring,sothattheinstrumentwithoutaccesstothecircuit,thepointercanbestoppedatanypositiononthedial.(V)
15,accordingtotheinstrumentontheelectricfieldorexternalmagneticfielddefenseability,dividedintoI,II,III,IVfourlevel.Undertheinfluenceofanexternalmagneticfieldoranelectricfield,thesecondaryinstrumentallowsitsindicationvaluetobechangedby+1%.(V)
16.Measurethecurrentofammeter,internalresistanceisbigger,thebetter.(x)
17,theinternalresistanceisnotavailablemultimeterohmfiledirectmeasurementmicroammeters,standardcellorgalvanometer.(V)
18,whetherthemeasuredDCorACelectroscope,theneonlamplightgunisthesamesituation.(x)
19,equippedwithlow-voltageelectroscopeneonbulbcandistinguishline(line)andtheground,canalsocheckouttheACorDClowvoltagedigitaldisplay;inadditiontotheinspectionbodychargedwithelectroscopewithoutelectricity,butalsoforwiredisconnection.(V)
20,strippingplierscanbeusedtostriptheinsulationlayerinthecoreareaofloadfollowing6mm2plasticorrubberwireline,itshouldhaveadiameterof6mmandthefollowingincision.(x)
21,theprotectionofelectriciron,thewiringcanbeconnected,orcannotwiring.(x)
22.Manualoilpressureconnectionplierscanbeusedtopresscopperandaluminumwireswith16~240mm2crosssection.(V)
23,wheninstallingearthwire,shouldbeinstalledthree-phaselineend,andtheninstallthegroundend;whenthedemolitionoftheopposite,firstremovethegroundend,andthenremovethethree-phaselineend.(x)
24,weldingmachineoneortwowiringlengthshouldnotexceed20m.(x)
25.TheACammeterandvoltmeterindicateallvalidvalues.(V)
26,insulationbootsalsocanmakeacid,alkaliresistance,rainbootsuse.(x)
27,copperhasgoodconductivityandthermalconductivity,highmechanicalstrength,butintestinghighereasilyoxidized,meltingtimeisshort,shouldbeusedasfastmelt,protectivetransistor.(x)
28,lowmeltingpoint,longmeltingtimeofmetalmaterials,tinandlead,suitableforhighvoltagefusemelt.(x)
29,strongelectricitycontactandweakcontact,theperformancerequirementsarethesame,thematerialsusedarethesame.(x)
30.Aluminumnickelcobaltmaterialsusedassensors,speakersandmicrowavedevicesarepermanentmagnetsandcanprovideaconstantmagneticfieldinacertainspace.(V)
31.Whenaluminumwiresarejoined,theycannotbewrappedortwistedlikecopperwires,justbecausethemechanicalstrengthofaluminumwiresispoor.(x)
32,thesafetyofwireflowatdifferentenvironmentaltemperatureshavedifferentvalues,thehigherthetemperature,thegreaterthesafecarryingcapacity.(x)
33,thesteelcorealuminumwirethroughtheAC,duetotheskineffectofalternatingcurrent,thecurrentactuallyonlyflowsthroughthealuminumwire,sotheeffectivecross-sectionalareaisonlypartofthealuminumwire.(V)
34,theresistancecoefficientofsoil,undergroundcableswillaffecttheheatdissipation,thusaffectingthesafecarryingcapacityofcable.Resistancecoefficientis,thegreaterthesafecarryingcapacityofcable.(x)
35、thecabletube(TC)andthetubewallarethin,itsnominaldiameterreferstoitsinnerdiameter.(x)
36,barewirelayingheightindoorsmustbemorethan3.5m,lessthan3.5m,notsetup.(x)
37,thewirelayingintheceilingorceiling,cannotweartubeprotection.(x)
38,shortcable,tractionhours,tractionheadcanbeusedtoallowthewirecoretobeartension;whentractionislarge,youcanusewirejackettraction.(x)
39,allwearlines,pipejointsshouldnotbemorethan1.(x)
40,thecablecoresometimessuppressedround,semi-circular,fan-shapedandothershapes,thisistoreducethesizeofthecable,andsaverawmaterials.(V)
41.Theprotectivelayerofthecableistheconductorofthecablecore.(x)
42,thecableinthemove,thecabletrayshouldbeplacedflatinthecar,inordertofixed.(x)
43.Inpaperinsulatedcables,theworkingvoltageofthewrappedleadcableishigherthanthatofthewrappedleadcable.(x)
44,mediumandlowpressurePVCcables,polyethylenecablesandXLPEcables,usuallyaswellaspaperinsulatedcables,haveafullysealedmetalsheath.(x)
45,cableinoperation,aslongastheloadmonitoringdonotexceedtheallowablevalue,doesnotneedtomonitorthetemperatureofthecables,whicharebothconsistent.(x)
46,thecableinthesteelsawwhentheprocessistousethediameterof2.0mm,copperaround3~4tie,steelatighttie,copperwirewindingdirectionshouldandsteelarmourwindingisopposite.(x)
47、whenthepowerstationisoutofpower,firstpulltheisolatingswitch,thencutoffthebreaker.(x)
48,highvoltageisolationswitchinoperation,iftheinsulatorsurfaceseriousdischargeorinsulatorrupture,shouldbeimmediatelyisolatedhigh-voltagedisconnectingswitch,outofoperation.(x)
49、highvoltageloadswitchhasarcextinguishingdevice,itcanbreakshortcircuitcurrent.(x)
50,thereplacementoffusetubequartzsand,quartzsandparticlesizeisthesame.(x)
51,thestandbytransformershouldalsolightgasrelayintothesignalcircuit.(V)
52,noloadvoltagetransformer,inthetransformerswitchafterswitching,shouldbemeasuredeachphasewindingDCresistance,eachphaseDCresistancedifferenceisnotgreaterthan10%ofthethree-phaseminimumvalueisqualified.(x)
53.Usuallytheshuntcapacitorgroupdischargesitselfthroughthevoltagetransformerorthedischargebulbafterthecircuitiscutoff.Therefore,afterthepowerstationiscutoff,thereisnoneedtocarryoutmanualdischarge,sothatthemaintenanceworkcanbecarriedout.(x)
54.Afteraperiodofuse,thestoragebatteryhasfoundthatthevoltageofsomebatteriesisverylow,andmostofthebatteryvoltagesarestillhigh,andtheycancontinuetobeused.(x)
55、electromagneticover-currentrelayisinstantaneousaction,oftenusedincircuitandequipmentover-currentprotectionorquickbreakprotection.(V)
56、theactiontimeofinductiveovercurrentrelayisproportionaltothesquareofthecurrentflowing.(x)
57、gas(gas)protectioncannotonlyreflectallkindsoffaultsintransformeroiltank,butalsoreflectsomefaultsoutsidethetank.(x)
58、theprimarycurrentofthecurrenttransformerdependsonthetwocurrent,thetwocurrentisbig,andtheprimarycurrentislarger.(x)
Melt59,replacementofhighvoltagefuse,canbeweldedwithtinorcopperorsilvershot,alsoavailablePewterorsilver,alsocanmeltPewterorzinc.(x)
60,whenthevoltagetransformerisinoperation,itsoilfillingplugshouldbetightened.(x)
61、vacuumcircuitbreakerissuitablefortheindoortransformersubstationandtheindustrialandminingenterprisesin35kVandbelow,whichrequirefrequentoperationoccasionsandfaults,andisespeciallysuitableforbreakingthecapacitiveloadcurrent.Itsoperationandmaintenanceissimpleandnoiseissmall.(V)
62shuntcapacitorbanksareallowedtooperateat1.1timestheratedvoltageandallowlongerthan30%oftheratedcurrentofthecapacitor.(V)
63、inductiveovercurrentrelayhasthefunctionofelectromagneticcurrentrelay,timerelay,signalrelayandintermediaterelay.Itcannotonlyrealizetheovercurrentprotectionwithtimelimit,
Moreover,thecurrentfastbreakingprotectioncanberealized.(V)
64,thegeneralknifeswitchcannotcutoffthefaultcurrent,andcannotwithstandtheelectricandthermaleffectscau
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