轮机英语机考题汇编.docx

轮机英语机考题汇编.docx

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轮机英语机考题汇编

主编：

张龙刚教授

马进副教授轮机长

宋娜高级讲师

主审：

杨之伟教授轮机长

特别感谢

青岛远洋船员学院

山东交通大学海运学院

山东海事大学

烟台大学海运学院

青岛港湾学院

青岛海洋职业技术学院

1．Whenashipinloadedconditionfloatsatarbitrarywaterline,itsdisplacementis___totherelevantmassofwaterdisplacedbytheship.

A.equalB.largerC.smallerD.equivalent

2．Thedisplacementofashipis___tothetotalweight,alltold,oftherelevantloadedship.

A.largerB.equalC.smallerD.equivalent

3.Whichoneistrue?

A.Twomainareasofskillareinvolvedintheconstructionofship.

B.Therearedistinctdivisionsinresponsibilitiesbetweennavalarchitectsandmarineengineers.

C.Eachshipwillassumevaryingproportionsaccordingtoitstype.

D.Shipscanbedividedintodifferentcategoriesfromdifferentperspectives.

4.Whyagearboxisneededinashipdrivenbyamedium-speeddieselengine?

A.Toreducethemainenginespeed.

B.Toincreasethemainenginespeed.

C.Togovernthemainenginespeed.

D.Tofixthepropellershaft.

5.Apropeller,inordertooperateefficiently,mustrotateatarelatively___speed.

A.highB.lowC.fastD.lowly

6.Inadieselengine,________offerstheheatenergydirectly;________worksasworkingmediumandchangestheheatenergytomechanicalenergy.

A.theburningofthefuel;mediumshaftB.fuelspray;freshair

C.fuel;fuelsprayD.theburningofthefuel,theburnedgasmixture

7.Inadieselengine,________worksasworkingmediumandchangestheheatenergytomechanicalenergy,___________changesthereciprocatingmovementtorotarymoment.

A.fuelspray;theburningofthefuelB.theburnedgasmixture;connectingrod

C.mediumshaft;crankshaftD.theburnedgasmixture;pistonrod

8.Oneofthedifferencesbetweenatwo-strokeengineandafour-strokeengineis,_________.

A.atwo-strokeengineworkswithoutexhaustoperation

B.atwo-strokeengineworkswithoutcompressionstroke

C.atwo-strokeengineworkswithoutexpansionstroke

D.atwo-strokeengineworkswithoutsuctionoperation

9.Oneofthedifferencesbetweenatwo-strokeengineandafour-strokeengineis,_________.

A.atwo-strokeenginecan’tworkwithoutcylinders

B.atwo-strokeenginecan’tworkwithoutpiston

C.atwo-strokeenginecan’tworkwithoutcrankshaft

D.atwo-strokeenginecan’tworkwithoutablower

10.Inadieselengine,withthefuelisinjectedintothecylinder,________________.

A.thepistonisjustcomingupwardfromthebottomdeadcenter.

B.thepistonhasmovedaboutone-fifthoftheup.

C.thepistonhasmovedmostofthewayupandalmostreachedtheTDC.

D.thepistonhasjustpasttheTDC.

11.___________isthemainreasonthatreducesthepoweradvantageofatwo-stokeengineoverasamesizefour-strokeonetoabout_________.

A.Inefficientscavenging;twice

B.Inefficientscavenging;1.8times

C.Fewerstrokesinacircle;twice

D.Fewerstrokesinacircle;1.8times

12.Iftheengineisnaturallyaspirated,orisasmallhigh-speedtypewithacentrifugalturbocharger,theperiodofvalveoverlap,i.e.whenbothvalvesare____,willbe_____,andtheexhaustvalvewillclosesome10°______topdeadcanter.

A.open;short;afterB.closed;short;after

C.open;long;beforeD;closed;long;before

13.Inatwo-strokeengine,therearealwaysaseriesofopeningsknownas________,andinsomecircumstances,therearealsoopeningsknownas_________,inthepartofthecylinderlinerinsidethescavengingairbox.

A.scavengingairports;exhaustportsB.inletports;scavengingairports;

C.scavengingairports;inletportsD.exhaustports;inletpots

14.Insometypeoftwo-strokeengines,besidessomesmallholesfor______,startingvalve,safetyvalve,indicatorcock,andsoon,thereisalargecentralopeningineachcylindercoverformountingthe_________.

A.fuelvalves;exhaustvalveB.exhaustvalve;inletvalve

C.fuelvalves;inletvalveD.exhaustvalve;fuelvalve

15.Inatwo-strokeengine,thepistonconsistsofalowerpart,whichinnamedas______andusuallymadeof_______,andaupperpart,whichisreferredtoas______andmadeof______.

A.low-half,castiron;top-half,heat-resistantsteel

B.low-half,aluminum;top-half,stainlesssteel

C.pistonskirt;castiron;pistoncrown;heat-resistantsteel

D.pistonskirt;aluminum;pistoncrown;stainlesssteel

16.Inordertokeeptheoilfilmonthecylinderlinerduringtherunning-inperiod,thepistonringareslightlyrounded__________________.

A.onboththeexternalandinternaltopedges

B.onboththeexternaltopandbottomedges

C.onboththeexternalandinternalbottomedges

D.onallthefouredges

17.Inordertocontrolthermalstresses,sometypesofmodernenginesusepistonwith_________.

A.heavywallandintensivecoolingB.heavywallandno