船舶电气与安全习题英文版ppt课件.ppt

《船舶电气与安全习题英文版ppt课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、The______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.freshwatergener

2、ator1892Theoperationofparallelingtwoalternatorsrequiresthevoltagestobe______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.singl

3、ephaseB.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.capacitiv

4、eC.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.microm

5、eterD.feeler1898"gaugepressure"means______“表压”即是“超过大气压的压力”。A.vacuumB."theexcessofpressureaboveatmosphere"C."figureonagauge"D.Anyoftheabove1899Amanometerisusedtomeasure_____压气计用来测量压力。A.pressureB.temperatureC.volumeD.specificgravity1900Theviscosityregulatorcontrolsthefueloiltemperature______provideoi

6、latthecorrectviscosityforcombustion.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.maintainaconstantfuelvisco

7、sityatthefuelvalvesC.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.theenginescav