高级维修电工试题目

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1、高级维修电工试题目SeniormaintenanceelectriciantesttitleII.judgmentquestions:1.ACnegativefeedbackcanplaytheroleofextendedpassband(V)2.to13decimalnumberintoabinarynumberis1011(x)3.thebinarynumber01010010tosixteenhexadecimalnumberis52H(V)4.A+B二A+Bformulaiscorrect(x)Theinputofth

2、e5.TTLallowsthevacant,vacantequivalenttolowlevelinput(x)・Third6.threestateoutputstateisahighimpedancestate(V)The7.flip-flophasamemoryfunction"(V)8.monostablemultivibratorcanmaketimingcontrol(V)9.555timercanbeconnectedinmonostablemultivibratorandconnected,butnotSchmi

3、dttrigger(x)10.powerFETbelongstobipolardevices(x)11.single-phasehalfbridgeinverter(voltage)oftheoutputvoltageforasinewave(x)8.belongtotheDC/DCchoppertransform(V)The13.circuitDCtoACconverteriscalledfrequencyconversioncircuit(x)14.three-phasethreewireACvoltageregulati

4、oncircuittriggerpulsewidthpulseshouldbeused(>600)(V)lastoftwoorthreevolumesThebiggestdifferencebetween1.open-loopcontrolsystemandclosedloopcontrolsystemisthatthereexistsonefromcontrolledquantityinclosedloopcontrolsystemTheinputtothefeedbackchannel(V)Theaccuracyof2.v

5、oltagenegativefeedbackspeedregulationsystemisbetterthanthatofspeedfeedbacksystem・(x)3.doubleclosedloopspeedregulatingsystemincludescurrentloopandspeedring.Thecurrentloopisanouterring,andthespeedringisaninnerloop・(x)4.speedandcurrentdoubleclosedloophigh-speedsystemde

6、bugging,usuallydebugthecurrentloopfirst,andthendebugthespeedloop・(V)5.,toeliminatethevibrationofLongmenplanerworktableistoadoptthestablelink.(V)The6.isplacedinthemiddleofthememoryelementsisbasedontheproceduretodistinguishtherequirements(V)7.inthestatetabledetectione

7、lementistheintermediaterelay(x)8.,weoftenseeaPLCmachinewithXXpointsoftheI/Onumber,istobeabletoinputandoutputswitchesandThetotalnumberofanalogsignals,correspondingtothenumberofrelays・(V)Boththeinputandoutputportsofthe9.PLCareisolatedbyphotoelectricity・(V)10.PLCalthou

8、ghelectronicproducts,butitsanti-interferenceabilityisverystrong,canbeinstalleddirectlyinthehighvoltagecabinet・(V)11.,aproductionlineusingP