轮机英语题库新题(阅读理解部分)0.doc

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1、二、关联题Passage1TheSulzermulti-levelaccumulatorsystemforcylinderlubricationhasprovedparticularlybeneficialtogoodpiston-runningbehaviour.Thecylinderoilisfedtothelinersufaceattwolevelsofquills.Thislubricatingoilandisthereforeconsideredtobeefficientandeconomical.Thelubri

2、cationoilpumpsaredrivenbyafrequency-controlledelectricmotorandtheoilisdistributedtothequillaccumulatorsbyoildistributors.Withthissolution,muchlesspipingisrequired.Thecylinderoilfeedrateiscontrolledaccordingtotheengineload.Adjustmentsdependingontheengineconditionand

3、forrunning-incanbeeasilymadebyusingsoftwareintheenginecontrolsystem.1.Whatisthemainideaofthispassage?A.ThelubricationsystemofmainengineB.HowtocontrolthelubricationC.ThecylinderlubricationofmainengineA.Howtomakerunning-ineasier1.HowmanytiersofcylinderoilquillsA.oneB

4、.twoC.threeD.four3.Howisthecylinderoilfeedratecontrolled?A.accordingtotheenginespeedB.accordingtotheengineloadC.accordingtoboththeenginespeedandloadD.notmentionedinthisparagraph4.Howarethelubricationoilpumpsdriven?A.bycamshaftB.byhydraulicmotorC.bypneumaticmotorD.b

5、yelectricmotorPassage2TheclearlyvisiblebenefitofRT-flexenginesistheirsmokelessoperationatallshipspeeds.Thisisachievedbythesuperiorcombustionperformancewiththecommon-railfuelinjection.Thissystemmaintainsthefuelinjectionpressureattheoptimumlevelrightacrosstheenginesp

6、eedrange,ensuringoptimumcombustionunderalloperatingconditions.Inaddition,aselectiveshut-offofsingleinjectorsatverylowspeedsandanoptimizedexhaustvalvetiminghelptokeepsmokeemissionsbelowthevisiblelimit.SulzerRT-flexenginesalsohavetheadvantageofsteadyrunningatlowerspe

7、edsthanengineswithmechanically-controlledinjection.Theycanrunverysteadily,andwithoutsmoking,at10-12%ofnominalspeed,whichfortheRT-flex60Cisabout10-14rpm.Thisismadepossiblebytheprecisecontrolofinjection,togetherwiththehigherinjectionpressuresachievedatlowspeed,andthe

8、sequentialshut-offinjectors.1.Accordingtothefirstparagraph,theadvantageofcommon-railinjectionis:A.smokelessoperationB.shocklessoperationC.noisele