内河轮机电气试题精选,专门针对大管轮的（the inland river turbine electrical examination question selects, specially aims at the big pipe wheel）

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内河轮机电气试题精选,专门针对大管轮的（Theinlandriverturbineelectricalexaminationquestionselects,speciallyaimsatthebigpipewheel）1.toexpandtherangeofammetershuntresistanceincreases,themeasurablerangeofcurrent______.A.decreasesB.,increasesC.,andD.remainsunchangedAnswerA2.wattmetervoltagecoilnumber______,thinnerwires,andtheload______.A.less/lessseriesB./parallelC.more/seriesD.more/parallelAnswerD30thousandmeteriscomposedof______etc..A.header,measuringlineandswitchB.head,measuringcircuitandshellC.header,switch,andshellD.header,measuringline,switchandshellAnswerD4.rotorwindingsofthree-phaseasynchronousmotor,whenwindingwindingis______,squirrelcagewindingis______. A.open/closedB.closed/closedC.open/openD.closed/opencircuitAnswerB5.asynchronousmotorusingY-conversionmethodofstarting,startingcurrentanddirectcurrentwhenstartingis______,startingtorqueandstartingtorquedirectratio______.A.1/3,1/3B.1/3,1C.1,1/D.,AnswerA6.asynchronousmotorinthemotorworkingstate,theslipSfor______.A.S>1B.S=0C.01C.S<0D.S=0AnswerA89.therunningthree-phaseasynchronousmotor,ifwanttocarryonthebraketostop,inallkindsofbrakingmethod,theshockcurrentisbiggest:A.energybraking,B.reversebraking,C.regenerativebraking,D.mechanicalbrakingAnswerB 90.marineDCgeneratorgenerallyadopts______excitationmethod.A.seriesexcitedB.compoundexcitedC.shuntD.permanentmagnetAnswerBTheexternalcharacteristicsof91.DCgeneratoristhattherelationshipbetween______.A.outputvoltageandoutputcurrentB.ratedoutputvoltageandexcitationcurrentC.noloadvoltageandexcitationcurrentD.noloadvoltageandoutputcurrentAnswerANinety-twoThemethoddoesnotchangetheDCshuntmotorsteeringis______.A.exchangethearmaturewindingbothendsconnectionB.tochangetheexcitationwindingbothendswiringPositiveandnegativeD.AorBofC.switchingpowersupplyAnswerC 93.comparedwiththeACasynchronousmotor,DCmotoristhebiggestadvantageof______.A.costislow,B.maintenanceworkisless,C.structureissimple,D.speedcontrolperformanceisgoodAnswerD94.DCshuntmotorunderno-loadorlightload,andwindingincircuitbreaker,will______.A.makesthemotorcannotrotate,B.makesthemotorspeedcannotreachtheratedspeedC.makesthespeedveryhigh,andtheD.stillrunsnormallyAnswerC95.ofChina'smarinepowerstationbusinA,B,Cthreecoloris______.A.A-brown,B-yellow,C-blueB.A-purple,B-brown,C-redC.A-green,B-yellow,C-brownD.A-red,B-yellow,C-GreenAnswerC96.inthequasisynchronousandcar,oftenaccordingtothesynchronousrotationtablepointerisapointer______closing switch,shouldbethebest.A.clockwiserotation,3to5Sturn,until11o'clockB.turncounterclockwise,turn3to5S,andturnto11C.goesclockwise,turns3to5S,andarrivesat12D.turncounterclockwise,turn3to5S,andturnto12AnswerA97.accordingtothevoltagelevelrequirementsofthemarineinstrument,thesecondaryvoltageofthevoltagetransformeris______V.A.380B.220C.100D.36AnswerC98.lightingdeviceaccordingtotheenvironmentalconditionsofthedifferentlevelofprotectioncanbedividedintothefollowingthreetypesof______.A.protectiontype,waterprooftype,explosion-prooftypeB.protectiontype,waterprooftype,flameretardanttypeC.protective,antidrop,flameretardantD.antidrop,flameretardant,drytypeAnswerA