轮机英语期末考试试题A卷.doc

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1、《轮机英语》A卷姓名：成绩：单项选择题（每题2分共100分）1.Thedieselengineissimilartothegasolineengineinthat_______.A.BothofthemareignitedbycompressedairB.BothofthemaretheformsofexternalcombustionenginesC.BothofthemhavesparkplugsD.Thepowerisdevelopedbythepistoninthecylinder2.T

2、heratioofthbrakehorsepowertotheindicatedbythe______.A.ThermalefficiencyB.MechanicalefficiencyC.BrakethermalefficiencyD.Volumetricefficiency3.Theignitionquality,ofdieselfueloilisindicatedbythe______.A.SpecificgravityB.CetanenumberC.ViscosityD.Calorifi

3、cvalue4.Howarethepressureandtemperatureaffectedinadieselenginecylinderduringcompression?A.PressureandtemperaturedecreaseB.PressureandtemperatureincreaseC.PressuredecreasesandtemperatureincreasesD.Pressureincreasesandtemperaturedecreases5.Analuminiump

4、istonhaslowerinertiaandhighercoefficientof____comparedtothatofcastironA.ViscosityB.TwistingmomentsC.InertiaD.Thermalexpansion6.Eachcylinderisclosedatthetopbya_____,madeofaspecialheat-resistantsteel.A.CylinderlinerB.CouplingflangeC.CylindercoverD.Pist

5、on7.Theamountoffueldeliveredbyahelicalplungertypefuelinjectionpumpiscontrolledby_______.A.RotationofthepumpplungerB.RotationofthepumpbarrelC.VaryingthepumpsupplypressureD.Varyingthepumpreturnpressure8.Inadieselenginelubeoilsystem,whichofthefollowingp

6、artsshouldbelubricatedfirst?A.CamshaftbearingB.MainbearingC.PistoncrownsD.Cylinder9.Sacrificialzincanodesareusedonhesaltwatersideofdieselengineheatexchangersto______.A.ReduceelectrolyticactiononheatexchangermetalsB.Keepheattransfersurfacesshinyandcle

7、anC.PreventrapidaccumulationofmarinegrowthD.Provideaprotectivecoatingonheatexchangersurfaces10.Inaturbocharger,inletairvelocityisincreasedinthe_____.A.InletnozzleringB.StationarydiffuserpassagesC.CompressoroutletvoluteD.Rotatingimpellervanes11.Diesel

8、enginecylinderairstartvalvetimingiscontrolledby______.A.EngineoperatingspeedB.AnairmanifoldC.AhydraulicdistributorD.Theairdistributor12.Ifthecompensatingneedlevalveofahydraulicgovernorisopenedmorethannecessarythegovernorwill_______.A.Havealargerthann