轮机英语42期考题.doc

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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：801适用对象：无限、近洋航区3000KW及以上船舶轮机长（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68题，每题1分，第69题至76题，每题1．5分，第77题至78题，每题10分。一、单项选择题1.Duringthevalveoverlapperiod,theexhaustpressureofaturbochargedfour-stroke/cycledies

2、elenginemustbelessthantheintakemanifoldpressuretoensure______.A.effectivecylinderscavengingandcoolingB.constantpressurefromtheturbochargersC.cooleroperationoftheexhaustsystemD.effectiveconstantpressureforturbochargeroperation2.Therelativeairpressureintheinletmanifoldofaturbochargeddieseleng

3、ineisusually______.A.greaterthantheaverageexhaustmanifoldpressureB.lessthantheaverageexhaustmanifoldpressureC.greaterattheturbinewheelthanattheimpellerD.greateratreducedenginespeed3.Coolingofenginesisachievedbycirculatingacoolingliquidaroundinternal______withintheengine.A.airB.passagesC.pip

4、esD.means4.Anover-speedsafetydeviceisusuallyfittedtoageneratorenginefor___intheeventofover-speed.A.stabilizingtheshipspeedB.increasingthefuelpumpsettingC.brakingthecrankshaftD.cuttingpowerofftheengine5.Theamountoffueldeliveredbyahelicalplungerfuelinjectionpumpiscontrolledby______.A.varyingt

5、hepumpdischargepressureB.varyingthepumpreturnpressureC.rotationofthepumpplungerD.rotationofthepumpbarrel6.Prolongedoperationofadieselenginewithaclosedcoolingwatersystem,atlowerthannormaldesignedoperatingtemperaturescan______.A.increasepoweroutputB.decreaselubeoilviscosityC.eliminatefuelknoc

6、kD.causesulfuricacidformation7.Ifthesump______weretorisethiswouldindicatewaterleakageintotheoilandaninvestigationintothecausemustbemade.A.temperatureB.viscosityC.leverD.level8.Inadieselengine,whenrefittingpistonringsyoushould______.I.checktheringgapatthesmallestdiameterofthecylinderII.remov

7、ecarbonfromtheringgrooveA.IonlyB.IIonlyC.bothIandIID.neitherInorII9.Fuelhasbeeninjectedbutignitionfails.Thepossiblecausemaybe______.A.slightlyleakyexhaustvalveB.increasedscavengingairtemperatureC.enginecylindersnotscavengedsufficientlyD.toomuchwaterinthe