轮机英语机考题汇编Word下载.docx
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轮机英语机考题汇编Word下载.docx
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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;
D.Fewerstrokesinacircle;
12.Iftheengineisnaturallyaspirated,orisasmallhigh-speedtypewithacentrifugalturbocharger,theperiodofvalveoverlap,i.e.whenbothvalvesare____,willbe_____,andtheexhaustvalvewillclosesome10°
______topdeadcanter.
A.open;
short;
afterB.closed;
after
C.open;
long;
beforeD;
closed;
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;
stainlesssteel
16.Inordertokeeptheoilfilmonthecylinderlinerduringtherunning-inperiod,thepistonringareslightlyrounded__________________.
A.onboththeexternalandinternaltopedges
B.onboththeexternaltopandbottomedges
C.onboththeexternalandinternalbottomedges
D.onallthefouredges
17.Inordertocontrolthermalstresses,sometypesofmodernenginesusepistonwith_________.
A.heavywallandintensivecoolingB.heavywallandno
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