搜索
期海船船员适任统考试题（总第48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88题，每题1分，第89题至96题，每题1.5分。一、单项选择题1.Dieselenginesclassifiedasreciprocatinginternalcombustionenginesbecausethey____A.useenergyfromfuelburnedoutsidetheircylindersB.burnfuelinacombustionchamberthatmovesbackandforthC.burnfuelinachamberwhereitsenergymovesapistonupanddownD.acontinuouscombustionprocesstoimpartrotarymotiontothepistons2.Theabbreviation“MIP”standsfor_____A.middleindicationpressureB.meanindicatedpressureC.meanindicatedpitchD.middleindicatedpower3.Thetermusedtoexpresstheignitionqualityofaparticularfuelis_____A.cetanenumberB.octanenumberC.ignitionindexnumberD.volatilitypoint4.Theperiodwhenbothinletvalvesandexhaustvalvesareopenisreferredtoas____A.valveloopB.valveuniflowC.valveoverlapD.valvegrinding5.Whichofthefollowingstatementsrepresentsthefunctionofthecompressionringsinstalledatthetopofadieselenginepiston?A.ControltheamountoflubeoilburnedinthecombustionchamberB.TransmitheatfromthepistontothecylinderlinerC.Preventdamagetoringgrooveinsertsbyactionasaheatdam.D.Dissipatecombustionchambergaspressurebychannelingitthroughtheringgap.6.Thegasloadsontheenginestructureareconstrainedbymeansofhydraulicallypreloaded_____Whichconnectthebedplate,framesectionsandcylinderjacketsintoasingleunit.A.connectingrodsB.meanbearingC.columnD.therods7.______ofdifferentthicknessareinsertedbetweentheshellstoenableadjustmentofthebearingclearness.A.ScrewsB.FilmsC.DisesD.Shims8.Comparedtofour-stroke/cycleengines,two-stroke/cycledieselengineshavethedisadvantagesof____A.lesseventorqueB.highercylinderheadtemperaturesC.fewerpowerstrokeperrevolutionD.greaterweight/sizerequirements9.Duringthefuelimectionperiod,fuelpressuremustexceedcylindergaspressureto_____A.ensurepenetrationanddistributionofthefuelinthecombustionchamberB.ensuretheneedlevalveisflushedcleanduringeachinjectionC.preventcombustiongasblowbackintotheopenneedlevalveD.preventreflectedpressurewaveswhentheneedlevalvecloses10.Theupperpistonringsinlarge,slow-speed,two-strokecycledieselenginesaremosteffectivelylubricatedbyoil____A.fedfrommechanicallubricatorsB.thrownofffromthemainbearingsC.suppliedformwickfeddriplubricatorsD.flowfromacentrifugalbanjooiler11.Inadieselengineclosedfreshwatercoolingsystem,theamountofcoolantflowingthroughtheheatexchangeiscontrolledbythe_____