轮机三管轮考证英语44期试题加答案

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1、屮华人民共和国海事局2006年第3期海船船员适任证书全国统考试题（总第41期）科目：轮机英语试卷代号：805适用对象：无限、近洋航区3000KW及以上船舶二/三管轮（本试卷卷面总分100分，及格分为70分，考试时间为100分钟）答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分，第79题至80题，每题10分。一、单项选择题1.Thedieselengineissimilartothegasolineengineinthat・A.Bothofthemareignitedbycom

2、pressedairB.BothofthemaretheformsofexternalcombustionenginesC・BothofthemhavesparkplugsD.Thepowerisdevelopedbythepistoninthecylinder2.Theratioofthbrakehorsepowertotheindicatedbythe.A.ThermalefficiencyB.MechanicalefficiencyC.BraketheimalefficiencyD・Volumetricefficiency3.Theignitionquality,

3、ofdieselfueloilisindicatedbythe・A.SpecificgravityB.CetanenumberC.ViscosityD・Calorificvalue4.Howarethepressureandtemperatureaffectedinadieselenginecylinderduringcompression?A.PressureandtemperaturedecreaseB.PressureandtemperatureincreaseC・PressuredecreasesandtemperatureincreasesD.Pressure

4、increasesandtemperaturedecreases5.AnaluminiumpistonhaslowerinertiaandhighercoefficientofcomparedtothatofcastironA.ViscosityB・TwistingmomentsC・InertiaD・Thermalexpansion6・Eachcylinderisclosedatthetopbya,madeofaspecialheat-resistantsteel.A.CylinderlinerB.CouplingflangeC・CylindercoverD・Pisto

5、n7.Theamountoffueldeliveredbyahelicalplungertypefuelinjectionpumpiscontrolledby•A.RotationofthepumpplungerB.RotationofthepumpbarrelC・VaryingthepumpsupplypressureD・Varyingthepumpreturnpressure8.Inadieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?A.CamshaftbearingB

6、.MainbearingC・PistoncrownsD・Cylinder9.Sacrificialzincanodesareusedonhesaltwatersideofdieselengineheatexchangersto.A.ReduceelectrolyticactiononheatexchangermetalsB.KeepheattransfersurfacesshinyandcleanC.PreventrapidaccumulationofmarinegrowthD.Provideaprotectivecoatingonheatexchangersurfac

7、es10.Inaturbocharger,inletairvelocityisincreasedinthe.A.InletnozzleringB・StationarydiffuserpassagesC・CompressoroutletvoluteD.Rotatingimpellervanes11・Dieselenginecylinderairstartvalvetimingiscontrolledby・A.EngineoperatingspeedB・AnairmanifoldA.AhydraulicdistributorD.Theaird