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1、船舶電子技工題庫電氣系12級船電班Thursday,January09,2014【关联题】Insynchronousmachines,adirectcurrentisappliedtotherotorwinding,whichthenproducesarotormagneticfield.Therotoristhenturnedbyaprimemoverproducingarotatingmagneticfield.“Fieldwindings”appliestothewindingsthatproducethemainmagnet

2、icfieldinamachine,and“armaturewindings”appliestothewindingswherethemainvoltageisinduced.Forsynchronousmachines,thefieldwindingsareontherotor,sotheterms“rotorwindings”and“fieldwindings”areusedinterchangeably.Therotorofasynchronousgeneratorisalargeelectromagnetandthemagn

3、eticpolesontherotorcaneitherbesalientornon-salientconstruction.Non-salientpolerotorsarenormallyusedforrotorswith2or4polesrotor,whilesalientpolerotorsareusedfor4ormorepolesrotor.(1)Theprimemovermentionedinthepassagedoesnotinclude.A.dieselengineB.windpowerC.Waterpower(2)

4、Non-salientpolerotorsarenormallyusedforthosewithpoles.A.notmorethan2pairsB.notmorethan4pairsC.morethan2pairs(3)WhichofthefollowingstatementsisnotTRUE?A.FieldwindingsproducethemainmagneticfieldB.AdirectcurrentisusedtoproducemagneticfieldC.Themainvoltageisproducedbyarmat

5、urewindings(4)Theword“salient”means.A.prominentB.pointingoutwardsC.noticeable【单选】TheEnglishfor“兆欧表”is.A.MeggerB.VoltmeterC.Multimeter【单选】Theisusedtomeasurecurrent.A.ammeterB.voltmeterA.wattmeter【单选】isaverticalheightbetweenthesealevelandthebottomoftheship.A.LOAB.BeamC.B

6、readth【单选】TheoftheM/Eis5500kwat115rpm.A.outputB.temperatureC.speed【单选】Theinsulationclassofanelectricmotorindicatesits.A.Maximuminputofhorsepower.B.MaximumtemperatureriseoftheinsulationmaterialC.Maximuminputofkilowatts【单选】TheEnglishfor“电压表”is.A.VoltmeterB.SynchrometerC.

7、Ammeter【单选】TheSOLASConventionisthemaininternationalconvention.A.Coveringsafetyoflife.B.AboutmarineC.Aboutmarinepollutionprevention【单选】isusedtomeasurethevoltage.A.SynchrometerB.AmmeterC.Voltmeter【单选】Theindicatorcockisfixedonthecylinder.Themeaningof“indicatorcock”is.A.示功

8、阀B.排气阀C.安全阀【单选】Voltagewillalwaysleadcurrentina/an.A.inductivecircuitB.capacitivecircuitC.magneticcircuit【单选】Remotecon