轮机英语大证考试真题42期

1中华人民共和国海事局2007年第1期海船船员适任证书全国统考试题(总第42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.The______engineisusedforalternatorsandsometimesformainpropulsionwithagearboxtoprovideapropellerofbetween90to120rpm.A.four-strokeB.two-strokeC.slowspeedD.reversible2.Thedischargeflowofareciprocatingpumpis______.A.steadyB.inpulsationC.continuousD.large3.Thecetanenumberofadieselfueloilindicatesits______.A.viscosityB.acidcontentC.heatingvalueD.ignitionquality4.Alwaysensurethattheturninggearis______,evenatthequay,thewavefromothershipsmayturnthepropellerandthustheengine.A.disengagedB.engagedC.assembledD.disassembled5.Camshaftsareusuallydrivenbytiminggearsor______.A.pushrodsB.chaindrivesC.rockerarmsD.flywheels6.Thecylinderoilispumpedintothecylinder(vianon-returnvalves)whenthepistonringspassthelubricatingorifices,during______.A.theupwardstrokeB.thedownwardstrokeC.thepowerstrokeD.thesuctionstroke7.Thetotalstartingaircapacityrequiredforreversiblemainenginesistobesufficientforaleast______.A.sixconsecutive(连续的)startsB.eightconsecutivestartsC.tenconsecutivestartsD.twelveconsecutivestarts8.Adirtydieselengineoilfilterelementcanbestbedetectedby______.A.visualinspectionoftheelementsB.thepressuredropacrossthefilterC.highlubeoilsumptemperatureD.decreaseinoilviscosityfromthefilter9.Beforeamarinedieselengineisstartedthecylindersandpistonsmustbe______.A.cooledtoappropriatetemperatureB.warmedupgraduallytoappropriatetemperatureC.openedupandrenewedD.groundandpolished10.Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor__.A.frictionclutchesB.disconnectclutchesC.reversinggearsD.reductiongears11.Themaximumpressuredevelopedbyawasteheatboilerisdeterminedbythemainengineexhaust______.A.gascompositionB.gastemperatureC.pressureD.timing12.______continuouslyextractthecrankcaseatmosphere,viaapipesystem,andmoveitpastasensitiveandaccurateopacity(不透明)measuringtrack.A.TheoilmistdetectorsB.ThesmokedetectorsC.AnoilywatermonitorD.Oildischargemonitoringandcontrollingsystem13.Thewaterinasteamingauxiliaryboilershouldbetesteddailyfor______.A.dissolvedoxygenB.chloridesC.sludgeD.dissolvednitrogen14.Afireboxexplosioninanautomaticallyfiredauxiliaryboilermaybetheresultof_____.A.excessivepurgingbeforelightingoffB.insufficienttrailforignitionperiodC.afaultytransformerintheignitioncircuitD.insufficientpurgingafterlightingoff15.Afeedpumpforanauxiliaryboilermightlosesuctionifthe______.A.boilerwaterlevelislowB.feed-wateristoohotC.boilersteamdemandislowD.feed-wateristoocold16.Thegearandscrewpumpsareclassifiedas______.A.variablestrokepumpsB.multistagepumpsC.positivedisplacementpumpsD.triple-portedpumps17.Thepressureofaliquidleavingthepumpcanbereferredtoasthe______.A.totalheadB.dischargeheadC.netpositivesuctionheadD.suctionhead18.Whichofthevalveslistedwillbecycledfromfullyopentofullyclosedwhenthehandleisturned90degree?A.ArisingstemgatevalveB.AglobestopvalveC.AcheckvalveD.Abutterflyvalve19.Apumpshaftthatisbentordistortedshouldnormallybe______.A.repairedbyasuitableweldingprocessB.straightenedbyapplyingheatandtorsionC.reconditionedbymetallizingandmachiningD.replacedwithasatisfactoryspare20.Acentrifugalpumpmayfailtodeliverwaterwhenfirststartedifthe______.A.watersealpipeispluggedB.pumpisnotprimedC.sealringisimproperlylocatedD.impellerisflooded221.Whichofthefollowingconditionsmustexistforheattoflowfromoneobjecttoanother?A.Thetwoobjectsmustbeinphysicalcontact.B.Thetwoobjectsmustbethesamesize.C.Theremustbeanexistingtemperaturedifferential.D.Theremustbeanexistingweightdifferential.22.Thedewpointofairisreachedwhenthewetbulbtemperatureis______.A.twicethedrybulbtemperatureB.10℃abovethedrybulbtemperatureC.5℃abovethedrybulbtemperatureD.equaltothedrybulbtemperature23.Ifairat95℃drybulbtemperatureand50%relativehumidityisconditionedto75℃drybulbtemperatureand50%relativehumidity,itisanexampleof_____.A.coolingonlyB.coolingandhumidifyingC.coolinganddehumidifyingD.adiabatic(绝热的)cooling24.Inordertoachievegreaterdehumidification(除湿)withanairconditioningsystem,youshould______.I.reducethecoolingcoiltemperatureII.increasethere-heatertemperatureA.IonlyB.IIonlyC.BothIandIID.NeitherInorII25.Oilywaterseparatorsareusedtoensurethatshipsdon'tdischargeoilwhenpumpingout______.A.ballastwaterB.boilerwaterC.bilgewaterD.sewagewater26.Whenstarted,acompleteoilywaterseparatingunitisfirstfilled______.Theoilywatermixtureisthenpumpedthroughtheinletpipeintothecoarseseparatingcompartment.A.withdirtywaterB.withcleanwaterC.byoilywaterD.bymixedwater27.Whichisthepollutionpreventionequipment?A.boosterpumpB.evaporatorC.incineratorD.cooler28.Theoilsludgeisburntinthe______onboard.I’llshowyoutheashes.A.boilerB.mainengineC.auxiliaryengineD.incinerator29.Mostmarinebiologicalsewagetreatmentplantsconsistofallthefollowingstatementsexcept______.A.aerationtanksB.settlingtanksC.disinfectionagentD.anaerobicbacteria(厌氧菌)30.Greatcareisdedicatedtotheremovalof_____fromthescavengeair.A.gravityB.viscosityC.density