電工高級工試題

Three.Operationquestions

1.Accordingtothediagram,thefollowingsingle-phasecontrollablevoltageregulatingcircuitisinstalledanddebugged

Preparationrequirements:

Serialnumbernametypeandspecificationunitquantity

1diodeVD12CP12only1

2diodeVD22CP12only1

3diodeVD32CP12only1

4diodeVD42CP12only1

5diodeVD52CZ11Donly1

6diodeVD62CZ11Donly1

7zenerdiodeV72CW64,18~21Vonly1

8thyristorVT8KP1-4only1

9thyristorVT9KP1-4only1

10singlejunctiontransistorV10BT33only1

11resistorR11.2KOmega0.25Wonly1

12potentiometerRP100KOmega1Wonly1

13resistorR35.1Komega(3.5K),0.25Wonly1

14resistorR4330,0.25Wonly1

15resistorR5100,0.25Wonly1

16resistorR64.7KOmega0.25Wonly1

17resistorR74.7KOmega0.25Wonly1

18adjustablepotentiometerRP6.8KOmega0.25Wonly1

19polyestercapacitorC10.1F/160Vonly1

20transformersT,220/50,Vonly1

21fuseFU10.2Aonly1

22fuseFU10.2Aonly1

23bulbIN220V/60Wonly1

24singlestrandgalvanizedcopperwire(usedforconnectingcomponents)AV-0.1mm2meters1

Morethan25strandsoffinecopperwire(usedforconnectingcomponents)AVR-0.1mm2M1

26universalprintedwiringboard

(orrivetplate)2mm*70mm*100mm(or2mmx150mm*200mm)block1

27electriciron,ironrack,solderandfluxselfsetting1

28DCregulatedpowersupply0~36Vonly1

29signalgeneratorXD1only1

30oscilloscopeSB-10orselfsetting1

31singlephaseACpowerto220Vand36V,5A1

32electrictestpencil,universaltoolpliers,screwdrivers(shapeandcross),electricknife,pliers,wrenches,plierslive1setsetc.

330thousandTable1

34,laborprotectionproducts,insulationshoes,overallsandothersetsof1

Solution:followingtheinstallationanddebuggingofthediagram,thefollowingsingle-phasecontrollablevoltageregulatingcircuit

Assessmentrequirements:

(1)beforeloading,checkthequalityofthecomponents,checkthenumberandspecificationsofcomponents,suchaspartsfoundinthedebuggingdamage,accordingtothedamagecomponentpoints.

(2)withintheprescribedtime,accordingtotherequirementsofthedrawingstoinstallthecorrectandskilled,andcorrectlyconnecttheinstrumentandinstrument,cancorrectlydebug.

(3)thecorrectuseoftoolsandinstrumentation,installationqualityshouldbereliable,installationtechnologytomeettherequirementsoftheprocess.

2、installationanddebuggingofthree-phaseasynchronousmotordoubleinterlock,positiveandnegativestart,energyconsumptionbrakingcontrolcircuit

Preparationrequirements:

Serialnumbernametypeandspecificationunitquantity

1three-phasefourwirepowerto3*380/220V,20A1

2singlephaseACpowerto220Vand36V,5A1

3three-phasemotorY112M-4,4kW,380V,deltaconnectionmethod;orcustom1

4distributionboard500mmx600mm*20mmblock1

5combinationswitchHZ10-25/31

6ACcontactorCJ10-10,coilvoltage380V,or

CJ10-20,coilvoltage380V,only4

7thermalrelayJR16-20/3,settingcurrent10~16Aonly1

8timerelayJS7-4A,coilvoltage380V,only1

9rectifierdiodes2CZ30,15A,600Vonly1

10fuseandcorematchingRL1-60/20sleeve3

11fuseandcorematchingRL1-15/4sleeve2

12triplebuttonLA10-3HorLA4-3H2

13terminalsJX2-1015500,V,10,A,15ormatchingselfbar1

14woodscrewsPhi3*20mm;Phi3*15mm30

15flatwasherPhi4mm30

16ballpen,selfsupport1

17plasticsoftcopperwireBVR-2.5mm2,colorselfmade20meters

18plasticsoftcopperwireBVR-1.5mm2,colorselfmade20meters

19plasticsoftcopperwireBVR-0.75mm2,colorselfmade5meters

20donotpressthepressureterminalUT2.5-4,UT1-420

21lineslotTC3025,alengthof34cmand3.5mmbeat5holediameter

22specialplasticpipePhi3mmm0.2

23electrictestpencil,universaltoolpliers,screwdrivers(shapeandcross),electricknife,pliers,wrenches,plierslive1setsetc.

240thousandTable1

25Eurotablemodel,custom,or500V,0~200M,Taiwan1

260~50clampammetersAblock1

27,laborprotectionproducts,insulationshoes,overallsandothersetsof1

Solution:installationanddebuggingofthree-phaseasynchronousmotor,doubleinterlock,positiveandnegativestarting,energyconsumptionbrakingcontrolcircuit

Assessmentrequirements:

(1)accordingtotherequirementsofthedrawings,theinstallationofthecorrectandskilled;componentsshouldbearrangedonthewiringboardreasonable;installationshouldbecorrectandtight;wiringrequirementsaretightandbeautiful;thewireshouldbecarriedouttrough.Theproperuseoftoolsandinstruments.

(2)thebuttonboxisnotfixedontheboard;thepowersupplyandthemotorwiringandthebuttonconnectionshallbeconnectedtotheterminalrow;theleadwireoftheincomingandoutgoingslotshallbeprovidedwithterminallabels,andtheoutletterminalshallbeprovidedwithadifferentialpressureterminal.

(3)safeandcivilizedoperation.

(4)intheprocessofassessment,theassessorshouldbesupervisedandpayattentiontosafety.

Seniorelectricianexaminationquestionsandanswers

Author:safetymanagementnetworksource:securitymanagementnetworkhits:1629UpdateDate:December11,2009

Fillintheblanks

1,therepairoftheDCmotorno-loadtest,thepurposeistocheckthemechanicalpartsoftheoperationisnormal,whetheroverheating,sound,vibration.

2、theexcitationmodeofDCtachometergeneratorcanbedividedintoexcitationtype,excitationtypeandexcitationtype.

3,thewholemachineaftermorethanhalfofthereplacementofthebrush,itisbesttofirst1/4~1/2ratedloadrunningmorethan12h,sothatthebrushhasagoodmatch,thenfullloadoperation.

4,synchronousmotorspeedandACfrequencytomaintainastrictrelationship,whichissynchronousmotorandasynchronousmotorisoneofthebasicdifferences.

5.Therotorofthesalientpolesynchronousmotorconsistsofarotatingshaft,amagneticyokeandamagneticpole.

6.Adjusttheairgapintheinternalreactanceoftheweldingtransformertoobtaindifferentweldingcurrent.Whentheairgapincreases,thereactanceofthereactordecreases,andtheweldingworkcurrentincreases.Whentheairgapisreduced,thereactanceofthedeviceincreases,andtheweldingcurrentdecreases.

7、asynchronousmotorno-loadtest,

Timeisnotlessthan1min.Testshouldbemeasuredwhetherthewindingoverheatingorunevenheating,andtocheckwhetherthetemperaturerisebearingnormal.

8,thecontrolmotorischaracterizedbysmallpower,smallsize,lightweightandhighprecisionrequirements.

9,afterwindingofthetransformer,theendpointofthesamenameoftheoneortwowindingisdetermined,buttheconnectiongroupisuncertain.

10,theso-calledthree-phasesymmetricalwinding,referstoeachphasewindingstructureparametersarethesame,andinspaceeachhas120degreesofphasedifferenceofthree-phasewinding.

11,alotofmotorinsulationtreatment,thedippingprocessissuitableforautomaticproductionline;vacuumpressureimpregnationqualityisverygood,buttheequipmentisexpensive;immersionequipmentissimple,istheproduction,repairofacommonlyusedpaintdippingmethod.

Testitem12,aftertherepairofasynchronousmotorincluding:windingonthechassisandinterphaseinsulationresistance,windinginthecoolingstateofDCresistancemeasurement,no-loadtest,windingonthecasingandtheinteractionbetweenthemotorinsulationstrengthtest.

13,cagerotorbrokencagerepairmethodsareasfollows:weldingmethod,coldweldingmethod,changestripmethod.

14,rotorwindingmotorrotorrepairshouldgenerallydomechanicalbalancetest,soastoavoidvibrationwhenthemotorrunning.

15.Themainfunctionofthecontactorcontactisthatthecontactcanstillbereliablycontactedafterthecontactisworn.Thesizeofthepassisrelatedtothecontactlife.Forsinglebreakcoppercontacts,thesumof1/3~1/2ofthecontactthicknessisusuallytaken.Forthesilverorsilverbasedcontacts,thesumofthesumofthecontactthicknessofthestaticanddynamiccontactsisgenerallytakenas1/2~1.

16、thereleasevoltage(current)valueoftheelectromagneticbreakerdependsonthefinalclearanceandspringpressureofthearmature.Ifthethicknessofthenon-magneticgasketisincreasedorthespringpressureisincreased,thereleasevaluecanbeincreased,therebyincreasingthereturncoefficient.

17,thearccoveris:(1)thelongitudinalguidearcblowout,topreventtheoccurrenceofinterphaseshortcircuit;(2)theinsulationwallcontactandarcinterrupter,therebyrapidlycooling,toincreasefreefunction,improvethearccolumnvoltagedrop,forcingtheextinctionofarc.

18,thebridgecraneinthetransferoflightloadoremptyhook,themotorelectromagneticmomentandloadtorqueinthesamedirection,whenthemotorstringintothemoreresistance,theloaddropspeedisslower.

19.Thecharacteristicsoftheelectricmeasuringmechanismdeterminethatthescaleoftheelectriccurrentmeterandvoltmeterisuneven,whilethescaleofthepowermeteriseven.

20,bymeasuringtheresistanceofDCWheatstonebridge,ifyoupressthepowerbuttonandthegalvanometer,thepointertothe"positive"deflection,thenshouldincreasetheresistancevalueshouldbereducedandarm,armresistancevalue.

21.TheoutputcharacteristicoftransistorreferstotherelationbetweenIcandUCwhenthebasecurrentisconstant.

22、thyristortriggercircuithasmanyforms,butitiscomposedofpulseformation,synchronousphaseshiftandpulsephaseshift.

23,factoriesandenterprisespowersupplymode,generallyhavestep-downpowersupplymodeandtwoantivoltagepowersupplymodetwo.

24,thethreeimportantindexestomeasurethepowerqualityofpowersystemarevoltage,frequencyandwaveform.

25,thevoltageistoohighortoolowwillaffectthenormaloperationofelectricalequipmentorburnedoutequipment.

26,thebasicrequirementsoftheworkshopdistributioncircuitisreasonablelayout,neatandbeautiful,solidinstallation,convenientmaintenanceandsafeandreliable

27.Thelayingmodesofcablesaredirectburiedlaying,cabletrenchlaying,cabletunnelandcablepipelaying,aswellasplainlayingandbottomlayingofbuildings.

28,theburiedcableoftheupperandlowerlayershouldbenolessthan100mmthicksoftsoilorsand,itmustcovertoprotecttheplate,thegroundmustbeinstalledwherenecessarysignpost.

29、thefunctionofhighvoltagecircuitbreakerincircuitistocloseandbreakthelineundernormalload.Whenthelineisshortcircuited,thecircuitwillbedisconnectedautomaticallythroughthefunctionofrelayprotectiondevice.Therefore,highvoltagecircuitbreakersbearthedualtasksofcontrolandprotection.

Thesingle-phasegroundingfaultoccurredin30,whenthepowersystemistheemptysequencecurrentandemptysequencevoltagetheemptysequencecurrentprotectiondeviceandzerosequencevoltageprotectiondeviceforautomaticremovalofsinglephasefaultandgroundinginsulationmonitoring.

31,electricallightinglayout,location,number,saidtobethelamptype,installationheightofalllampsandinstallationmethods,andrepairscapacity.

Two、judgmentquestions

1,DCmotorusuallyadoptsthecarbongraphitebrush,onlyinthelowvoltagemotor,withbrassgraphitebrushorcoppergraphitebrush.(V)

2,inthesurfaceofthecommutator,cuprousoxidefilmsoftenproducealayerofbrownluster,thislayeroffilmincreasesthecontactresistancebetweenthebrushandthecommutator,ithasgoodlubrication,andcanimprovethecommutation.(V)

3,alongandinsulatedDCmotorwithoutaging,iftheoneortwocoilshortcircuitfault,itcanbeusedformaintenancecutshortcircuitcoilconnectedtothecrosswiringintwoconnectedwiththecommutator,whichcontinuetouse.(V)

4,forasynchronousmotor,itsstatorwindingaroundtheincreaseinthenumberofturnswillleadtodifficulttowire,wastecopperwire,andwillincreasetheleakageresistanceofthemotor,therebyreducingthemaximumtorqueandstartingtorque.(V)

5,three-phaseasynchronousmotorstatorwinding,whethersingleordoublelayer,itspitchmustbepeopleinteger.(V)

6,ifthetransformerprimaryvoltageislowerthantheratedvoltage,thennomatterhowtheload,itsoutputpowermustbelowerthantheratedpower,thetemperatureriseisalsolessthantheratedtemperaturerise.(x)

7,ratedvoltageof380V/220Vsingle-phasetransformer,ifusedasastep-uptransformer,youcanaccessthe380Vpoweratthetwoside,inthefirstsideoftheoutputvoltageofabout656V.(x)

8、withanelectricweldingtransformerwithareactor,ifthecoreairgapofthereactorisreduced,theleakagereactanceisincreased,andtheweldingcurrentisincreased.(x)

9,thechoiceoftheratiooftheDCsinglebridgeistocomparetheseriesofarmsmultipliedbytheprogressionoftheseries,approximatelyequaltotheseriesofresistancestobemeasured.(V)

10,changethepowersupplyvoltageoftheDCsinglebridge,whichwillaffectthemeasurementaccuracyoftheresistance.

(V)

11whenmeasuringtheresistancewiththeDCdoublearmbridge,theleadlineofthebridgepotentialjointshouldbeclosertothemeasuredresistancethantheleadlineofthecurrentconnector.(V)

12.Theelectromagneticinstrumentcanmeasurethedirectcurrentorthealternatingcurrent,andthemagnitudeofthealternatingcurrentisthesameasthatofthetesteddc.(V)

13.Theshapeoftheloadvoltamperecharacteristiccurveisonlyrelatedtothecharacteristicsoftheloaditself,butnottothemagnitudeofthevoltageactuallyaddedtotheload.(V)

14.IntheRLCseriescircuit,thetotaleffectivevalueofthetotalvoltagewillalwaysbegreaterthanthevoltageeffectivevalueofeachcomponent.(x)

15,tocomparetwofrequencyandphasevoltage,canonlyusedoublelinewaveLu,singlesandfilterwillnotdo.(x)

16、single-phasebridgerectifiercircuitwithcapacitorfilter,theaveragevalueofitsoutputvoltagedependsonthetwovoltageoftransformer,andtheeffectivevalueisindependentofthemagnitudeofload.(x)

17.TheoutputresistanceoftheamplifierisinputfromtheamplifierTheequivalentresistancethatgoesinisaDCresistance.(x)

18whentherectifierinasingle-phasebridgerectifiercircuitisshortcircuited,thevalueoftheoutputvoltagewillfallbyhalf,andthecircuitwillbecomeahalfwaverectifiercircuit.(x)

19.Theequivalentcircuitofasinglejunctiontransistoriscomposedofadiodeandtworesistors.Therefore,whenaproperdiodeisusedandtworesistorsarecorrectlyconnected,thetransistorscanbeusedinsteadofsinglejunctiontransistors.(x)

20amplifieramplificationisaimedattheamountofchange,anditsamplificationistheratiooftheoutputsignalchanges.(V)

21.TheDCamplifieramplifiestheACsignal,buttheACamplifierdoesnotamplifytheDCsignal.(V)

22、theratioofthemaximumspeedandminimumspeedprovidedbythemotorintheno-loadconditioniscalledtherangeofspeedregulation.(x)

23,ifdisturbancesaregeneratedinsidethesystem,theyarecalledinternaldisturbances.Ifthedisturbancecomesfromtheoutsideofthesystem,thenitiscalledexternaldisturbance.Disturbancesaffecttheoutputofthesystem.(V)

24,theclosed-loopcontrolsystemadoptsnegativefeedbackcontrol,inordertoimprovethemechanicalcharacteristicsofthesystem,hardness,andexpandthespeedrange.(V)

Seniormaintenanceelectricianexaminationpaperandpartoftheanswer

First,themultiple-choicequestion

1.asshownintheDCcircuit,I:is()A.

(A)11(B)-5(C)15(D)5;

2.thetotalvoltageamplificationofthemultistageamplifierisequaltotheamplificationofthevoltageamplificationoftheamplifieratalllevels.

(A)and(B)difference(C)product(D)quotient

3.ifastraightlinecurrentdirectionfromnorthtosouth,putasmallneedlecanrotatefreelyontopofit,thenthesmallneedleN(bias).

(A)theWest(B);theEast(C);theSouth(D);theNorth

4.thephysicalquantitythatisindependentofthepermeabilityofthemediuminthemagneticcircuitis().

(A)magneticinductionintensity(B),magneticflux(C),magneticfieldstrength(D),magnetoresistance;

5.theunitofreluctanceis().

(A)Frederick/M(B),1/,Frederick(C),M/D

Themagnitudeoftheinducedelectromotiveforceinthe6.coilandinthecoil.

(A)themagnitudeofthemagneticfluxisproportional(B);themagnitudeofthemagneticfluxisinverselyproportional(C);therateofchangeofthefluxisproportionalto(D);therateofchangeofthefluxisinverselyproportional

7.coilwithinductanceof0.1H,whenitscurrentchangesfrom10Ato6Ain0.5seconds,theabsolutevalueofelectromotiveforcegeneratedonthecoilis()

(A)4V(B),0.4V(C),0.8V(D),8V

Themagnitudeoftheelectromotiveforceofthe8.mutualinductorisproportionalto(=)

(A)thevariationofcurrentinthiscoil.(B)thechangeinthecurrentofanothercoil.(C)therateofchangeofcurrentinthiscoil.(D)therateofchangeofthecurrentofanothercoil

9.,inthecaseoftheelectromagnetcoilcurrentunchanged,thearmaturewillbeabsorbedduringtheprocess,theironcoreofthemagneticfluxwillbe()

(A)becomelarger(B),smaller(C),invariant(D),unabletodetermine

10.usingatransistorplottertoobservetheoutputcharacteristicsof3AG1E,()

(A)thepolarityswitchesofthebaseladdersignalandthecollectorscansignalareboth"+"".

(B)thepolarityswitchesofthebaseladdersignalandthecollectorscansignalaredirectedto-".

(C)thebaseladdersignalpolarityswitchesareswitchedto"+",andthecollectorscansignalisdirectedto"-"-".

(D)thesteppedsignalpolarityswitchesare"-",andthecollectorscansignalis"+"".

Thepeakcollectoroutputvoltageofthe11.JT-1transistorplotteris(V)volts.

(A)100(B)200(C)500(D)1000

12.useaSBT-5typeoscilloscopetoobservearectangularpulsewithawidthof50microsecondsandarepetitionrateof5000HZ.Whenthescantimeissetat10milliseconds(scantrimmingisplacedoncorrection),thescreenappears().

(A)asinglepulseofapproximately5cmwidth(B),asinglepulseofapproximately10cmwidth(C),apulseofabout5cmwidth,twopulses(D),andapulseoftwowidthsofabout10cm

13.itisbettertouse()anoscilloscopewhenobservingpulseswithveryshortduration.

(A)ordinary(B)twinheald(C)synchronous(D)dualline

When14.SR-Btypedualoscilloscopeisusedtoobservethesignalwithlowerfrequency,thetriggermodeswitchismorefavorableinthepositionof'(''''.

(A)highfrequency(B)automatic(C)normal(D)random

15.,intheactualadjustmentofanalogamplificationcircuitstaticworkingpoint,usuallywith()asthestandard.

(A)Ib(B),IC(C),Uce(D),Ube

16.DCdifferentialamplificationcircuitcan().

(A)amplifycommonmodesignalsandsuppressYIdifferentialmodesignals.(B)amplifyingdifferentialmodesignalsandsuppressingYItoproducecommonmodesignals.(C)amplifycommonmodesignalsanddifferentialmodesignals.(D)suppressingcommonmodesignalanddifferentialmodesignalbyYI.

17.integratedoperationalamplifierisaamplifierwith()coupling.

(A)highmagnificationresistancecapacitance(B),lowamplificationresistance(C),highmagnificationdirect(D)lowamplificationmultipledirect

18.theseriesregulatorcircuitworksin()state.

(A)amplification(B)cutoff(C)saturation(D)arbitrary

Thetriggersignal19.orRStrigger(gate).

(A)sinewave(B)positivepulse(C)sawtooth(D)negativepulse

20.amultivibratorisacircuitforgenerating().

(A)sinewave(B)rectangularpulse(C)sawtooth(D)spirepulse

Twenty-one

Thecounterconsistsmainlyof().

(A)RCringmultivibrator.(B)quartzcrystalmultivibrator.(C)display.(D)triggers.

22.ifyouneedtostoretwobinarydigits,youneed()atrigger.

(A)1(B)2(C)4(D)8

23..TheanodeworkingvoltageofdomesticYSseriesfluorescentdigitaltubeis().

(A)1.5V(B),3V(C),6V(D),20V

49.theshaftofanoncommutatormotorcarries().

(A)tachometer(B)brake

(C)rotorpositiondetector(D)starter;

50.speedasynchronousthree-phasecommutatormotortotheminimumspeed,therotationofthebrushmovingmechanismmakesthephaseanglebetweenthebrushintoelectricangle().

(A)-180degrees(B),180degrees(C),0degrees(D),90degrees

51.frequencyconverterinthefrequencyconverter().

(A)onlyhasthevoltageregulatingfunction(B),onlyhasthefrequencymodulationfunction

(C)hasapressureregulatingandflowfunction(D)arevoltageandfrequencymodulationfunction

52.thechopperusedinDCmotorspeedregulationmainlyplaysarole.

(A)speedregulatingresistor(B),regulatingcurrent(C),regulatingreactance(D),regulatingvoltage;

53.three-phaseshunt(LI)commutatormotorspeedregulationappliesto()load.

(A)constanttorque(B)graduallyincreasestorque(C),constantpower(D),andgraduallyreducestorque

Thefrequencyconversionpowersupplyinthe54.frequencyconversionspeedregulationistheinterfacebetween().

(A)ACpowersupply(B)ACmotor;

(C)mainspowersupplyandACmotor(D)citypowersupplyandACpowersupply;

55.DCmotorchopperspeedregulation,youcanachieve().

(A)polespeedregulation(B),steplessspeedregulation(C),constantspeed(D),speedregulationwithgearseparation;

56.generatormotorspeedregulationsystemisatypical(speed)automaticcontrolsystem.

(A)openloop(B),halfclosedloop(C),DanBihuan(D)fullclosedloop

57.voltagenegativefeedbackspeedregulationsystemistostabilizetheDCmotorarmaturevoltagetoachievethepurposeofsteadyspeed,theprincipleisthearmaturevoltagechangesand().

(A)thespeedchangeisproportionalto(B),thespeedchangeisinverselyproportionaltothespeed

(C)thechangeofthespeedisproportionaltothesquare(D),andthechangeofthespeedisinverselyproportionaltothesquare

58.inthevoltagenegativefeedbackspeedregulationsystem,thepositivecurrentfeedbackisusedtoincreasethecurrentspeed,andtomakethemechanicalcharacteristicshard.

(A)decrease(B),increase(C),constant(D),microgain

59.inthespeedregulationsystem,whenthecurrentcut-offnegativefeedbacktoparticipateinsystemregulation,themaincircuitcurrentofthespeedregulatingsystem()

(A)toolarge(B),toosmall(C)normal(D)Zero

60.inthespeedregulationsystemwithoutanystaticdifference,thefunctionoftheintegrallinkmakestheoutput()riseandthedirectinputsignaldisappears

(A)curve(B),parabola(C),hyperbola(D),straightline

61.,withspeed,currentdoubleclosedloopspeedregulationsystem,inthestarting,theadjustmentfunctionmainlydependson()theregulatorproduces.

(A)current(B)speed(C),negativefeedbackvoltage(D),current,speedtwo

62.themainparametersofinductosynaredynamicrange,precisionandresolution,inwhichtheaccuracyshouldbe()um.

(A)0.2(B)0.4(C)0.1(D)0.3

Sixty-three

IntheCNCNCmachine,theprogrammablecontrollercancontrolthemachinetoolafterobtainingthecontrolinstruction.

(A)thefeedofthetable(B),thefeedofthecutter

(C)spindleshiftandtablefeed(D)toollibrarychangetool,oilpumprises

64.theprogramarrangementofmatrixsequentialcontrollerinearlyautomaticproductionlinecanbeaccomplishedby()matrixstorage(ZHU)andlogicaloperationjudgment.

(A)diode(B)triode(C)fieldeffecttransistor(D)singlejunctiontransistor

65.ACdoublespeedelevatorrunningspeedshouldgenerallybelessthan()M/Sbelow.

(A)1(B)2(C)2.5(D)3

66.ACautoselectedelevator,whentheelevator(freestate)fromthe3layertothe2layerwhenrunningon,someonepressthecallbuttontopressdown,4peoplecall,5peoplepressthecallbuttonandthecaristhe1floorbutton,theelevatorshouldbestopped(in)layer.

(A)5(B)4(C)2(D)1

67.,inordertoensurethesafeoperationofPLCACelevators,()electricalcomponentsmustbenormallyclosedcontacts,inputtothePLCinputinterface

(A)stopbutton(B)hallcallbuttonladder

(C)carpaperpushbutton(D)terminallimittravelswitch;

68.,inthecarto()ratedspeeddown,man-madespeedlimiteractiontospeedlimitersafetyclampjointactiontest

(A)115%(B)100%(C)125%(D)150%

69.commonlyreferredtoas"486"and"586"microcomputers,whereinthemeaningsof486and586are().

(A)specificationsformainmemorysize(B)chips

(C)thecapacityoftheharddisk(D)clocked

70.acompletecomputingsystem,including().

(A)computersandtheirperipheraldevices(B)hosts,keyboards,anddisplays

(C)softwaresystemsandhardwaresystems(D),analogcircuits,anddigitalcircuits

71.PLCprogrammablecontroller,thewholeworkprocessisdividedintofivestages,whenthePLCpoweroperation,thefirststageshouldbe().

(A)communicatewiththeprogrammer(B)toexecutetheuserprogram

(C)readinfieldsignals(D),selfdiagnostics

In72.ladderprogramming,normallyopencontactandbusconnectioninstructionmnemonicsshouldbe().

(A)LDI(B),LD(C),OR(D),ORI

73.hoursusuallyincludeworktime,time,restandlifetime,aswellasprocessing,preparationandendingtime.

(A)assist(B)inthelayoutoftheworkplace;

(C)downtimelosses(D)areconsumedwhennonproductiveworkisperformed.

74.,inthesituationoflargeloadandhighcenteringprecision,itisbettertochoose()tojoin.

(A)flatkey(B)semicirclekey(C)pin(D)spline

Theadvantageof75.beltdriveisthat.

(A)driveratioaccurate(B),compactstructure(C),stabletransmission(D),highefficiency

76.,thecenterdistanceislarge,thetemperatureisnothigh,butalsorequiresthetransmissionoftranslationalmotionshouldbeused()transmission.

(A)chain(B)belt(C)gear(D)worm;

77.,thepropermeshing(YAO)conditionofapairofstraightbevelgearsis().

(A)M1=M2(B)A1=A2

(C)M1=m2;A1=A2(D)M1=M2=m;A1=A2=a.

78.inthewormdrive,thegearofthewormisunchang