轮机英语真题47期,甲类三管轮

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1、2009年第1期海船船员适任统考试题（总第47期）一、单项选择题1.The____engineisusedforalternatorsandsometimesformainpropulsionwithagearboxprovideapropellerofbetween90to120rpm.A.four-strokeB.Two-strokeC.SlowspeedD.reversible2.Theabbreviation"MIP"standfor_____.A.middleindicatingpressureB.meanindicatedpressureC.Meanin

2、dicatedpitchD.Middleindicatedpower3.Thecetanenumberofadieselfueloilindicatesits_____.A.ViscosityB.AcidcontentC.HeatingvalueD.ignitionquality4.Inatwo-strokeenginethecamshaftrotatesat____theenginerotationalspeed.A.HalfB.twiceC.ThesamespeedasD.Fourtimes5.Adieselengineissimilartoagasolinee

3、ngineexceptthattheformerhasno_____.A.Cross-headB.CylinderC.ConnectingrodD.sparkplug6.Itiseasiertoreplaceadrycylinderlinerthanawetonebecause______.A.OfthethinwallthicknessB.honingmakesiteasiertomaintainthedesiredoilfilmC.WatersealsarenotrequiredD.Itfitsmorelooselyduetoadecreaseinheattra

4、nsferthroughthecompositewall7.Amainbearingconsistsoftwoshellswhicharesecuredbymeansofstudsand_____.A.TierodsB.ThroughboltsC.LeadwiresD.Bearingcaps8.Howeverfastorslowthecombustionrate,itisstilla_____betweencarbon,hydrogen,sulphandoxygenthatreleasesheat.A.PhysicaldeformationB.Stateexchan

5、geC.ChemicalreactionD.Coalescence9.Duringthefuelinjectionperiod,fuelpressuremustexceedcylindergaspressureto_____.A.EnsurepenetrationanddistributionofthefuelinthecombustionchamberB.EnsuretheneedlevalveisflushedcleanduringeachinjectionC.PreventcombustiongasblowbackintotheopenneedlevalveD

6、.Preventreflectedpressurewaveswhentheneedlevalvecloses10.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?A.CamshaftbearingB.MainbearingC.PistoncrownsD.Cylinderwalls11.Inadieselengineclosedfreshwatercoolingsystem,theamountofcoolantflowingthroughtheheatexchan

7、geriscontrolledbythe______.A.SuctionpressureregulatorB.ThermostaticbypassvalveC.SeawatertemperatureD.Waterlevelintheexpansiontank12.whichofthedieselenginecomponentlistedincreasesairdensityandhelpstoimproveengineoperatingefficiency?A.impellerB.AirbottleC.AircoolerD.Exhaustdiffuser13.a