单选810补.docx

单选810补.docx

《单选810补.docx》由会员分享，可在线阅读，更多相关《单选810补.docx（105页珍藏版）》请在冰豆网上搜索。

单选810补

1Compressedairisusedonboardship_____.

　A.forstartingdieselenginesB.inpneumaticcontrolsystem

　C.inpneumatictoolsD.Alltheabovearetrue.

2Theengineerinchargeshouldnotifythe_____intheeventofanyseriousoccurrenceorasituationwhereheisunsureoftheactiontotake.

　A.captainB.chiefengineerC.dutybridgeofficerD.secondengineer

3Atthecompletionofthewatcheachmembershouldhandoverto_____,ensuringthatheiscompetenttotakeoverandcarryouthisdutieseffectively.

　A.anoilerB.apumpmanC.hisreliefD.hisleader

4Increasingthetemperatureofafuelwillreduceitsviscosity,andvice-versa.Whatdoes'vice-versa'hereimply?

　A.Decreasingthetemperatureofafuelwillincreaseitsviscosity.

　B.Increasingtheviscosityofafuelwillreduceitstemperature.

　C.Reducingtheviscosityofafuelwillincreasethetemperature.

　D.Increasingthetemperatureofafuelwillincreaseitsviscosity.

5Amongthebasiccategoriesofequipment,whichofthefollowingsareusedtoallowthehydraulicenergytobecontrolled?

　A.hydraulicpumpsB.valvesC.hydrauliccylindersD.hydraulicmotors

6ThevoltagesmostcommonlyadoptedforACsystemareeither440Vor220V_____.

　A.two-phaseB.two-phraseC.three-phaseD.three-phrase

7Itiswellknownthatthewholepowerdistributionoftheship'selectricalservicesmainlydependonthe_____.

　A.sub-boardsB.mainswitchboards

　C.emergencyswitchboardsD.distributionboards

8Innocaseshallballastwaterbecarriedin_____exceptonthoserarevoyageswhenweatherconditionsaresoseverethatitisnecessarytocarryadditionalballastwaterincargotanksforthesafetyoftheship.

　A.ballasttanksB.oiltanks

　C.segregatedballasttanksD.cleantanks

9Anelectricallydrivenautomaticallyoperatingauxiliaryblowerisprovidedforslowspeeduniflowand_____ofalowspeeddieselengine.

　A.manoeuvringoperationsB.badcombustionC.coolingD.mooringtrial

10Fuelsofhighqualitywiththeirearlierignitionswillcausehigher_____pressureincylindersofadieselengine.

　A.compressionB.maximumC.ratedD.oil

11_____areplayaveryimportantpartinhydraulicsystemsbypreventinginteractionbetweendifferentpartsofthehydrauliccircuit.

　A.checkvalvesB.motors

　C.safetyvalvesD.reducingvalve

12Theovercurrentrelay_____themotorcontactorwhenthemotorexceedsitsratedcurrent.

　A.tripsB.connectsC.foulsD.destructs

13Thecentrifugeisaperfectlybalancedpieceofequipment,rotating_____,soallpartsshouldbehandledwithcare.

　A.atlowspeed　　　　　　　　B.athighspeed

　C.atmediumspeed　　　　　　D.Noneoftheabove.

14Thecentrifugalseparationoftwoliquidsresultsin_____.

　A.theformationofacircularinterfacebetweenthetwo

　B.theformationofacylindricalinterfaceamongthetwo

　C.theformationofacylindricalinterfacebetweenthetwo

　D.theformationofacircularinterfaceamongthetwo

15Withreferencetoanaxialpistonpump,whichoneofthefollowingstatementsiscorrect?

　A.Thecylindricalbarreliscoupledtothemotor.

　B.Thecylindricalbarrelhasanoddnumberofbores.

　C.Theboresendinsockets.

　D.Thesocketsfitintheswashplate.

16Ifthetemperaturerises,theoilwillbecomethinner,theamountthatleakwillbe_____andthesystemsunabletobuildupthepressurerequired.

　A.increasingB.increasesC.decreasingD.decreases

17Thepurposeoftheevaporationisto_____.

　A.absorblatentheatofvaporization

　B.absorblatentheatoffusion

　C.transferlatentheatofvaporization

　D.transferlatentheatoffusion

18Theprincipleofmechanicalrefrigerationis_____.

　A.theconversionofaliquidtoagas

　B.theabsorptionoftemperatureunderheat,pressure,compressionandexpansion

　C.thecompressionofaliquidundertemperatureandexpansion

　D.theabsorptionofheatundertemperature,pressure,compressionandexpansion

19Ifasingle-phasemotorrunsslowerthannormal,thecausemaybe_____.

　A.voltagehighB.underload

　C.startingwindingcutoutD.groundedstator/rotorcoils

20Switchboardmaybeopenfrontordeadfront.Inthecaseof_____,allthemovingormovableparts,switch-gear,circuitbreaker,contactors,etc.,aremountedbehindtheboard,whichmerelyshowstotheobserveraseriesofplainlevelswithvoltmeter,

　A.thefrontB.thebehindC.theformerD.thelatter

21Cage-typeinductionmotorshaveaverypoorpowerfactorwhichmaybeaslowas0.3-0.4when_____.

　A.startingB.runningC.athighspeedD.atfullload

22Thermocouplescanbeusedoverarangeoftemperaturefrom–25to+65andarecommonlyfoundin_____.

　A.coolingwatertemperaturemeasurementB.lubeoiltemperaturemeasurement

　C.iceroomtemperaturemeasurementD.