轮机英语试题十五.docx

轮机英语试题十五.docx

《轮机英语试题十五.docx》由会员分享，可在线阅读，更多相关《轮机英语试题十五.docx（13页珍藏版）》请在冰点文库上搜索。

轮机英语试题十五

试题十四

一、单项选择题：

1.Criticalspeedsoccurringwithintheoperatingspeedrangeofamainpropulsiondieselenginemaybechanged,orhavetheirdamagingeffectsreducedbya/an______.

A.enginesupportvibrationisolatorB.detunerorviscousfluiddamper

C.lightenedcrankshaftflywheelD.sphericallyseatedcrankshaftbearing

2.Precisionenginebearinginsertsaremanufacturedwithasmallportionofthebearingendsextendingbeyondthebearinghousingorcaps.Theinstallationprocessofthesebearingsrequiressufficient______.

A.overlapB.crushC.laporleadD.protrusion

3.Theenginehasoneortwogroupoffuelpumps,dependingupon______.

A.thenumberoffuelvalvesB.thenumberofcylinders

C.thespeedofengineD.thepowerofengine

4.Whichofthefollowingstatementsconcerningthefactorsaffectingignitiondelayiscorrect?

A.Anincreaseinintakeairtemperaturewillincreaseignitiondelay.

B.Anincreaseincoolanttemperaturewilldecreaseignitiondelay.

C.Anincreaseincombustionchamberturbulencewillincreaseignitiondelay.

D.Anincreaseincompressionratiowillincreaseignitiondelay.

5.______providinglubricatingfilms,oilusedinmarinedieselengineshastoremoveheatfromoilcooledpiston.

A.ExceptforB.BesideC.ExceptD.Inadditionto

6.Theabilityofanoiltoseparatecleanlyfromanoilandwatermixtureisreferredtoasits______.

A.precipitationnumberB.neutralizationnumberC.pourpointD.demulsibility

7.Beforedismantlingthepipe,wouldyou______theoilretainedinthehosewith______?

A.flash/freshairB.wash/freshwaterC.flush/compressedairD.rush/dieseloil

8.Before“standby”isrungontheenginetelegraph,itisusualtogivethemaindieselengineabrieftrial______aheadandastern.

A.withpowerB.onpowerC.withairD.onair

9.Anumberofcylinderlinersareenclosedinonecastironcasingtoforma______.

A.cylindercoverB.cylinderblockC.crankcaseD.bed-plate

10.Betweentheperiodsofinjectionandignitionofthefuel,adieselenginecrankshaftrotatesthroughthe______.

A.detonationperiodB.firingperiodC.delayperiodD.advanceperiod

11.Theturbo-blowercomprisesagasturbineanda______.

A.condenserB.blowerC.sootblowerD.airreceiver

12.Vesselpropellersareclassifiedasbeingrighthandorlefthand.Arighthandpropellerturnsclockwisewhenviewedfrom______.

A.thebowB.thesternC.theportsideD.thestarboardside

13.______therepairinsuchshorttimeisunknowntous.

A.HowtheyfinishedB.Howdidtheyfinished

C.ThathowtheyfinishedD.Thathowdidtheyfinished

14.Inasimplemechanicalgovernor,the______.

A.centrifugalforcerotatestheball-head

B.flyweightcentrifugalforceisbalancedbyspringforce

C.flyweightcentrifugalforceisbalancedbyhydraulicpressure

D.speederspringaloneactuatesthefuelcontrolrod

15.Wearinacylinderlinerisusuallydueto______.

A.frictionB.abrasionC.corrosionD.alloftheabove

16.Agovernorautomaticallycontrolsenginespeedbyregulating______.

A.fuelsupplyB.firingorderC.engineloadD.oillevel

17.Iftheviscosityoftheliquidbeingtransferredremainsconstantasthedischargepressureincreases,therotarypump______.

A.capacitywillincreaseB.capacitywilldecrease

C.suctionpressurewillincreaseD.suctionpressurewilldecrease

18.Thepurposeofthewearingringsusedinacentrifugalpumpisto______.

A.preventaninternalexplosioninthepumpwhenitisoverheated

B.enableavisualinspectionofthepumpwhileitisrunning

C.insureaproperalignmentofthepumpcouplingtothedriver

D.accommodateforfrictionbetweentheimpellerandthecasing

19.Whenaboilerisoperating,thewaterlevelinthegaugeglassreads______whentheboilerisshutdown.

A.lowerthanB.higherthanC.asmuchasD.thesameas

20.Theconcentrationoftotaldissolvedsolidsinthewaterofanauxiliaryboilercanincreaseasaresultof______.

A.seawatercontaminationB.frequentsurfaceblows

C.dissolvedoxygendeaerationD.frequentbottomblows

21.Forapurifierchangingtoagravitydiscwithsmallerholediameterwillmovetheinterfacetowardsthe______.

A.bowlperipheryB.bowlcenterC.uppersurfaceD.lowersurface

22.ForaL.O.purifier,Ifthebackpressureoftheoiloutletistoohigh,theinterfacebetweenoilandwaterinthebowlwill______.

A.beinterruptedB.movedownwardsC.moveoutwardsD.retainoriginalposition

23.Ifabilgepumpfailedtobuildupdischargepressure,youshouldcheckfor___.

A.excessivewaterinthebilgesB.acloggedsuctionstrainer

C.oilinthebilgesD.alloftheabove

24.Theoilsludgeisburntinthe______onboard.I’llshowyoutheashes.

A.boilerB.mainengineC.auxiliaryengineD.incinerator

25.Aclass‘C'firewouldmostlikelyoccurinthe______.

A.engineroombilgesB.mainswitchboardC.paintlockerD.ragbin

26.Ifthepumpforahydraulicanchorwindlassisoverheating,thecausemaybe______.

A.increasedpumpspeedB.excessivepumpdischargepressure

C.toolowofatiltingboxangleD.lowpumpspeed

27.Thehandsteeringisamethodbywhichthemotionoftherudderiscontrolledwith______.

A.amotor-drivensteeringwheelB.apneumaticsteeringwheel

C.ahand-drivensteeringwheelD.anelectricsteeringwheel

28.Anaxialpiston,variablestrokepumpisusedinavessel'shydraulicsteeringgear.Underpressure,oilcontinuallyleaksoutfrombetweenthevalveplate/cylinderbarrelandwill______.

A.causelossofhydraulicoilfromthesystem

B.resultinextremedamagetothepump

C.causedamagetothepumpifnotcontinuallydrainedfromthepumpcasing

D.resultinthesystemhighsidepressuretosubstantiallydropoff

29.Withreferencetooperatingafour-ramsteeringgearsystemunderemergencyconditions,whichoneofthefollowingstatementsisincorrect?

A.Onlyonepumpshouldbeusedatanytime

B.Theshipspeedshouldbereducedto70%ofthenormal

C.Watchkeepingofthesteeringgearshouldbeincreased

D.Limitationsofthesteeringgearshouldbeloggedbutthebridgeneednotbeinformed

30.Whichofthefollowingproblemscouldcauseairtoblowoutthroughtheinletairfilterofarunningcompressor?

A.ExcessivecompressioninthecylinderB.Abrokenintakevalve

C.AdirtyinletfilterelementD.Animproperlyadjusteddischargevalve

31.Whenarefrigerationcompressorisinthe'off'cycle,thethermalexpansionvalvewill______.

A.alwaysbewideopenwhenthecompressorrestarts

B.continuetooperateasifthesystemwereinoperation

C.remainopenuntilevaporatorpressureequalizes,thencloseuntilthecompressorrestarts

D.alwaysbecompletelycloseduntilthecompressorrestarts

32.Anincreasingheadpressureinarefrigerationsystem,withoutanycorrespondingchangeinthecoolingwaterinlettemperature,wouldprobablybecausedby______.

A.restrictioninrefrigerantpiping

B.airandnon-condensablegasesinthecondenser

C.waterintherefrigerant

D.floodingbackofliquidrefrigerantfromtheevaporator

33.Inarefrigerationsystem,ifthecoolingwatertothecondenserfails,the______.

A.boxtemperaturesolenoidvalvewillcloseB.expansionvalvewillclose

C.compressorwillshutdownD.kingvalvewillopen

34.Thebasictraininginfirepreventionandfirefightingshouldincludethetheoreticalelementswhichshouldcover______.

A.thethreeelementsoffireandexplosion

B.lowerandupperflammablelimits

C.classificationoffiresandapplicableextinguishingagents

D.alloftheabove

35.Sacrificialzincanodesareusedonthesaltwatersideofdieselengineheatexchangersto______.

A.reduceelectrolyticactiononheatexchangermetals

B.keepheattransfersurfacesshinyandclean

C.preventrapidaccumulationofmarinegrowth

D.provideaprotectivecoatingonheatexchangersurfaces

36.Toparallelanincomingmachinetoarunningmachinethereforeitisnecessarytoensurefirstlythat______.

A.twofrequenciesmustbebroughtintophase

B.theincomingmachineacceptsasmallamountofload

C.therunningmachinemustbeunload

D.bothvoltagesareequal

37.Self-exciteda.c.generatorwith‘erroroperated’voltagecontrolsystemsdrawthefullexcitationpowerforthemachineterminals.Thisdispenseswiththecurrenttransformers,reactorsandcapacitorsnecessaryforaccuratecompounding,butrenderstheexcitationsystemvulnerabletovariationsinitsoutputvoltage.Whichofthefollowingiscorrectaboutthegeneratormentionedaccordingtothesentencesabove?

A.Itconsumesnoexcitationpower.

B.Ithascurrenttransformers.

C.Componentsareneededforaccuratecompounding.

D.Itsexcitationsystemisvulnerabletovoltagevariations

38.WhichofthefollowingshouldbetheFIRSTstepinremovingageneratorfromparalleloperation?

A.Tripthegeneratorofftheswitchboard.

B.Turnoffallelectricalequipment.

C.Removetheloadfromthe'offgoing'generator.

D.Increasethecyclesofthegeneratorstayingontheline.

39.Thisarrangementis______iftheelementsaredirectlyconnectedtooneanotherandthecontrolactiontakesplacewithouthumaninvolvement.

A.amanualclosedloopB.amanualopenedloop

C.anautomaticclosedloopD.anautomaticopenedloop

40.Theviscosityregulatorcontrolsthefueloiltemperature______provideoilatthecorrectviscosityforcombustion.

A.inorderthatB.becauseofC.inordertoD.owingto

41.______isaprecautionwh