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1、电工技能鉴定考核试题库(精选)初级Electricianskillappraisalexaminationquestionbank(selected)primaryworker--------------------------------------------------------------------------------2004-6-200:10:15browsingtimes:12253------------------------------------------------------
2、--------------------------First,therightandwrong1、indicatinginstrumentcannotonlymeasuretheelectromagneticquantitydirectly,butalsocooperatewithvarioussensorstomeasurethenonelectricquantityoftemperature,pressureandflow.(V)2、theelectricmetercandoboththedirectc
3、urrent,thedirectcurrentandthehigheraccuracyammeter,voltmeter,andalsocandothesuccessratetable,frequencymeterandphasetable.(V)3,theaccuracyis1.5meters,thebasicerrorofmeasurementis+3%.(x)4,weshoulddirectlymeasuretheaveragevalueofthecurrentinthecircuit,wecancho
4、osetheelectromagneticsysteminstrument.(x)5、theadditionalresistanceofthevoltmetercannotonlyextendtherangeoftemperature,butalsoplaytheroleoftemperaturecompensation.(V)6,thevoltagetransformertwowindingisnotallowedtoopencircuit,currenttransformertwowindingshort
5、circuitisnotallowed.(x)7.DCammetercanbeusedinACcircuit.(x)8,canbemadenotonlyonammetercanmeasureACcurrent,DCcurrentcanbemeasured.(V)9,useamultimetertomeasureresistance,everychangetothepointerohmfilesatransferorder.(V)10,measuringACcircuitandactivepower,becau
6、seitisalternatingcurrent,soitsvoltagecoil,currentcoilandtwoendscanbearbitrarilyconnectedtotheroad.(x)11,withtwosingle-phasepowermetermeasuringthree-phasethreewireactiveloadpower,thereisatablereversal,thismustbewiringerror.(x)12,thepowersystemofthecurrentcoi
7、lcoilcounter,willleadtocounterdeflectionoftheneedle,butifthevoltagecoilisalsoreverse,youcanoperatenormally.(x)13、electromagneticsysteminstrument'sabilitytoresistexternalmagneticfieldinterferenceisstrongerthanmagnetoelectricinstrument.(x)14,Departmentofelect
8、ricmeterphasedidnotproducereactiontorqueofthehairspring,sothattheinstrumentwithoutaccesstothecircuit,thepointercanbestoppedatanypositiononthedial.(V)15,accordingtotheinstrumentontheelectricfieldorexter
