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1、船舶電子電氣英語黃埔二期訓(xùn)練專用秘籍1886Thestaringcurrentofana.c.motoris______theratedcurrent.交流電機的啟動電流比額定電流大得多。A.thesameasB.muchlargerthanC.lessthanD.equals1887Ammeteristomeasurethe______安培表用來測量電流。A.currentB.voltageC.powerD.frequencyInamodemthree-phaseA.C.synchronousbrushesgene
2、rator,theexcitationwindingisontherotor.Thatmeans_____對于現(xiàn)代三相交流同步有刷的發(fā)電機，勵磁線圈在轉(zhuǎn)子上。意即轉(zhuǎn)子上的線圈用于輸入勵磁電流。A.ThegeneratorneednotexcitationB.ThewindingontherotorisforinputtingexcitationcurrentC.TherearethreephasewindingsontherotorD.Thegeneratorhasbrushes1889Theovercurrentr
3、elay______themotorcontactorwhenthemotorexceedsitsratedcurrent.當(dāng)電動機超過額定電流時，過電流繼電器將跳開。A.connectsB.tripsC.foulsD.destructs1886B1887A1888B1889BThe______isameasureofthephasedifferencebetweenvoltageandcurrentandisexpectedasthecosineofphaseangle.功率因數(shù)可用來表示電壓與電流之間的相位差，表
4、達(dá)成相位角的余弦。A.powerB.efficiencyC.effectivepowerD.powerfactor1891Currentchangingindirectionandrisingandfallinginvalueis______方向、大小都變化的電流是交流電。A.A.C.B.D.C.C.generatorD.freshwatergenerator1892Theoperationofparallelingtwoalternatorsrequiresthevoltagestobe______andalsoi
5、nphase.兩臺交流發(fā)電機并聯(lián)，需要電壓相等，并且同相。A.zeroB.eliminatedC.differentD.equal1893The______,cagerotorinductionmotoristhefirstchoicemarinemotorinmostmodemshipsbecauseofitselectricalandmechanicalsimplicity.現(xiàn)代船舶上使用的電機都是三相電機。A.singlephaseB.twophaseC.threephaseD.fourphase1894The
6、star-deltastarterisaneffectivemethodof______voltagestartingofamotor.采用Y—△啟動器是電饑低電壓啟動的最好方法。A.increasedB.reducedC.unchangedD.Noneoftheabove1890D1891A1892D1893C1894BWitha______loadthevoltageandcurrentareinphase.對于純電阻負(fù)荷，電壓和電流同相。A.purelyresistanceB.capacitiveC.induc
7、tiveD.Noneoftheabove1896Increasingthetemperatureofafuelwill______itsviscosity.提高燃油的溫度將降低其粘度。A.increaseB.reduceC.keepD.Noneoftheaboveistrue.1897The______isusedtomeasurethevolumeofaliquidorgasthroughapipelinewithinanygivenperiodoftime.流量計用于測量在給定時間內(nèi)，通過管子的液體或氣體的體積。
8、A.flowmeterB.viscometerC.micrometerD.feeler1898"gaugepressure"means___“表壓”即是“超過大氣壓的壓力”。-75-船舶電子電氣英語黃埔二期訓(xùn)練專用秘籍A.vacuumB."theexcessofpressureaboveatmosphere"C."figureonagauge"
