轮机英语历年真题44期.doc

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1、中华人民共和国海事局2007年第6期海船船员适任证书全国统考试题(总第44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.bothofthemarei

2、gnitedbycompressedairB.bothofthemaretheformsofexternalcombustionenginesC.bothofthemhavesparkplugsD.thepowerisdevelopedbythepistoninthecylinder2.Theratioofthebrakehorsepowertotheindicatedhorsepowerofadieselengineisits________.A.thermalefficiencyB.mechanicalefficiencyC.brakethermaleffici

3、encyD.volumetricefficiency3.Theignitionqualityofdieselfueloilisindicatedbythe_________.A.specificgravityB.cetanenumberC.viscosityD.calorificvalue4.Howarethepressureandtemperatureaffectedinadieselenginecylinderduringcompression?A.PressureandtemperaturedecreaseB.Pressureandtemperatureinc

4、reaseC.PressuredecreasesandtemperatureincreasesD.Pressureincreasesandtemperaturedecreases5.Analuminumpistonhaslowerinertiaandhighercoefficientof_________comparedtothatofcastiron.A.viscosityB.twistingmomentsC.inertiaD.thermalexpansion6.Eachcylinderisclosedatthetopbya_________,madeofaspe

5、cialheat-resistantsteel.A.cylinderlinerB.couplingflangeC.cylindercoverD.pistoncrown7.Theamountoffueldeliveredbyahelicalplungertypefuelinjectionpumpiscontrolledby_________.A.rotationofthepumpplungerB.rotationofthepumpbarrelC.varyingthepumpsupplypressureD.varyingthepumpreturnpressure8.In

6、adieselenginelubeoilsystem,whichofthefollowingpartsshouldbelubricatedfirst?A.CamshaftbearingsB.MainbearingsC.PistoncrownsD.Cylinderwalls9.Sacrificialzincanodesareusedonthesaltwatersideofdieselengineheatexchangersto_________.A.reduceelectrolyticactiononheatexchangermetalsB.keepheattrans

7、fersurfacesshinyandcleanC.preventrapidaccumulationofmarinegrowthD.provideaprotectivecoatingonheatexchangersurfaces10.Inaturbocharger,inletairvelocityisincreasedinthe________.A.inletnozzleringB.stationarydiffuserpassagesC.compressoroutletvoluteD.rotatingimpellervanes11.Dieselenginecyl