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第三章船舶电气与船舶安全1886Thestaringcurrentofana.c.motoris______theratedcurrent.交流电机的启动电流比额定电流大得多。A.thesameasB.muchlargerthanC.lessthanD.equals1887Ammeteristomeasurethe______安培表用来测量电流。A.currentB.voltageC.powerD.frequencyInamodemthree-phaseA.C.synchronousbrushesgenerator,theexcitationwindingisontherotor.Thatmeans______对于现代三相交流同步有刷的发电机，励磁线圈在转子上。意即转子上的线圈用于输入励磁电流。A.ThegeneratorneednotexcitationB.ThewindingontherotorisforinputtingexcitationcurrentC.TherearethreephasewindingsontherotorD.Thegeneratorhasbrushes1889Theovercurrentrelay______themotorcontactorwhenthemotorexceedsitsratedcurrent.当电动机超过额定电流时，过电流继电器将跳开。A.connectsB.tripsC.foulsD.destructs1886B1887A1888B1889BThe______isameasureofthephasedifferencebetweenvoltageandcurrentandisexpectedasthecosineofphaseangle.功率因数可用来表示电压与电流之间的相位差，表达成相位角的余弦。A.powerB.efficiencyC.effectivepowerD.powerfactor1891Currentchangingindirectionandrisingandfallinginvalueis______方向、大小都变化的电流是交流电。A.A.C.B.D.C.C.generatorD.freshwatergenerator1892Theoperationofparallelingtwoalternatorsrequiresthevoltagestobe______andalsoinphase.两台交流发电机并联，需要电压相等，并且同相。A.zeroB.eliminatedC.differentD.equal1893The______,cagerotorinductionmotoristhefirstchoicemarinemotorinmostmodemshipsbecauseofitselectricalandmechanicalsimplicity.现代船舶上使用的电机都是三相电机。A.singlephaseB.twophaseC.threephaseD.fourphase1894Thestar-deltastarterisaneffectivemethodof______voltagestartingofamotor.采用Y—△启动器是电饥低电压启动的最好方法。A.increasedB.reducedC.unchangedD.Noneoftheabove1890D1891A1892D1893C1894BWitha______loadthevoltageandcurrentareinphase.对于纯电阻负荷，电压和电流同相。A.purelyresistanceB.capacitiveC.inductiveD.Noneoftheabove1896Increasingthetemperatureofafuelwill______itsviscosity.提高燃油的温度将降低其粘度。A.increaseB.reduceC.keepD.Noneoftheaboveistrue.1897The______isusedtomeasurethevolumeofaliquidorgasthroughapipelinwithinanygivenperiodoftime.流量计用于测量在给定时间内，通过管子的液体或气体的体积。A.flowmeterB.viscometerC.micrometerD.feeler1898gaugepressuremeans______“表压”即是“超过大气压的压力”。A.vacuumB.theexcessofpressureaboveatmosphereC.figureonagaugeD.Anyoftheabove1899Amanometerisusedtomeasure_____压气计用来测量压力。A.pressureB.temperatureC.volumeD.specificgravity1900Theviscosityregulatorcontrolsthefueloiltemperature______provideoilatthecorrectviscosityforcombustion.粘度调节器通过控制燃汕的温度实现粘度的控制。A.inorderthatB.becauseofC.inordertoD.owingto1895A1896B1897A1898B1899A1900CAviscosityregulatorusedforanengineisusuallyprovidedinordertoforan______engineburningheavyfueloil.柴油机的粘度调节器能保持燃油粘度恒定。A.regulatethefuelsupplyB.maintainaconstantfuelviscosityatthefuelvalvesC.maintainefficientcoolingD.alterthefueldensity1902Oilmistdetectorsareusuallyusedonboardtodetectoilmistdensitywithin______大型低速柴油机上的油雾检测器用于检测曲柄箱内滑油蒸汽的存在。A.theenginecrankcaseB.theenginescavengeboxesC.draintanksD.fueltanks1903UMSstandsfor______UMS代表“无人机舱’’。A.ultramuchspaceB.universalmediumsystemC.unitmachinedspaceD.unattendedmachineryspace1904Themaingeneratorsareconnectedto______主发电机与主配电板相连。A.distributionboardsB.sectionboardsC.emergencyswitchboardsD.mainswitchboards1901B1902A1903D1904D1905Theemergencygeneratororemergencybatteryisconnectedto______onmostlargeships.应急发电机或应急蓄电池与应急配电板相连。A.distributionboardsB.sectionboardsC.emergencyswitchboardsD.mainswitchboardsSwitchboardsmaybeofthedead-fronttypeinwhichalllivepartsareinstalledbehind______andonlytheoperationhandlesandinstrumentsareonthefront在表面不带电式的配电板中，带电部件安装在面板的后面，只有操作手柄和仪表在前面。A.thecapstanB.thecollectorC.thepanelsD.thesurface1907Remotecontrolmeansthat_____遥控，意即“系统位于远离操作者处”。A.thesystemismannedmanuallyB.thesystemissituatedremotelyfromtheoperatorC.thesystemiscontrolledautomaticallyD.alltheabove1908The______isacrystalwhich,underpressure,producesanelectriccurrentwhichvarieswiththepressure.压电式传感器是一种晶体，在压力下能产生电流，电流大小随压力变化而变化。A.alternatorB.glassthermometerC.burdontubeD.piezoelectricpressuretransducer1909handleandinstrumentsareonthefront.题干表达有误。可参考第1906题。A.openB.openfronttypeC.livefronttypeD.Noneoftheabove1905C1906C1907B1908D1909B1910WithUMS,whentheengineroomisunwatched_____willcontrolthemainengine.对于无人机舱，由值班驾驶员来控制主机。A.thebridgeofficeronwatchB.thechiefengineerC.thedutyengineerD.thedutymotorman1911Thedifferencebetweenmeasuredanddesiredvaluesiscalled______测量值和所需要值之间的差，称为“偏差”。A.make-upB.desiredvalueC.deviationD.setvaluesystemsareprovidedwithastand-bydevicewhichwillautomaticallybe______putinuseintheevenoftherunningdevicefailingthroughafaultcondition.备用设备装有自动启动系统，当运转设备故障时，便能自动投人使用。A.MannB.MonitoringC.Autostart-upD.NoneoftheaboveTheoperatingmediumforcontrolsystemsmaybe______控制系统的操作介质可以是压缩空气、液压油或电力。A.compressedairB.hydraulicoilC.electricityD.Alloftheabove1914______poweristhepowerdevelopedwithinthecylinderandcanbemeasm'edbyanengineindicator.指示功是气缸内发出的功率；可通过示功图来测量。A.TheshaftB.ThemechanicalC.TheelectricD.Theindicated1915______controlsystemisoneinwhichthecontrolactionisindependentoftheout-put.控制作用与输出量无关，这种控制系统是开环控制。A.FeedbackB.NegativefeedbackC.CloseloopD.Openloop1910A1911C1912C1913D1914D1915DPriortoanyoverhaulworkonelectricequipment,itisimportanttoensurethecircuitsare______对电气设备检修前，应确保电路切断。A.liveB.deadC.excitedD.online1917MoistureinaD.C.motorwouldcause____水分会引起直流电机短路