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1、技能鉴定维修电工试题（Skillsappraisalandmaintenanceofelectricaltestquestions）Professionalskillappraisalnationallibrary-maintenanceelectricianadvancedMaintenanceelectricianadvanced1.Singleoption46.Theworld'sfirstcomputerwassuccessfullydevelopedin1946.A,BritishB,FranceC,JapanD,UnitedStates47.Incaseo
2、fdeviation,thesystemwill().A,cannoteliminatedeviationB,caneliminatedeviationcompletelyC,onethirdofthedeviationcanbeeliminated,onehalfofthedeviationcanbeeliminated48.Thetaskoftheinverteristotake().A,alternatingcurrentbecomesdirectcurrentB,directcurrentbecomesacC,alternatingcurrentbecomes
3、acD,directcurrentbecomesdirectcurrent49.Switchingspeedoftheinsulatedgatebipolartransistor()powerfieldeffecttube.A,slightlyhigherthanB,lowerthanC,equaltoD,wellabove50.Thedirectcurrentmotorisusedtospeedthespeedofthechopper().A,thereisadditionalenergylossB,noadditionalenergylossC,weakenthe
4、magneticfieldD,andstrengthenthemagneticfield51.Theeffectofalternatingmagneticexpansionmachinecompensationwindingsis().A,improvethedirectaxischangetoB,improvethecrossaxisC,tooffsetthedemagnetizationoftheaxialarmaturereactionandreducetheresidualmagneticvoltage52.Whatiscommonlyreferredtoas
5、486and586microcomputers,themeaningof486and586is().A,mainmemorysizeB,chipspecificationC,harddiskcapacityD,mainfrequency53.Thefrequencyconverterinvariablefrequencyregulationisgenerallycomposedof().A,rectifier,filter,inverterB,amplifier,filter,inverterC,rectifier,filterD,inverter54.Thetime
6、quotausuallyincludestheworkingtime,thetimeoftheassignment,thetimeneededforrestandlife,and()andtheendtime.A,preparationB,auxiliarytimeC.Timespentinnon-productiveworkwhentimeislost55.TheanodeworkingvoltageofthedomesticYSseriesfluorescentdigitaltubeis().A,1.5VB,3VC,6VD,20V56.Timequotasusua
7、llyincludeassignmenttime,assignmenttime,timespentwithlife,preparationandendtimes,etc.A,B,restC.ShutdownlossD,non-productiveworkconsumption57.Thetimequotausuallyincludeshomeworktime,()time,restandlifeneeds,andprocessingpreparationandendtime.A,auxiliaryB,layoutworkC.ShutdownlossD
