轮机大管轮英语真题49期.docx
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轮机大管轮英语真题49期
轮机大管轮英语真题49期
中华人民共和国海事局
2021年第5期海船船员适任证书全国统考试题（总第46期）
科目：
轮机英语试卷代号：
819
适用对象：
无限、近洋航区3000KW及以上船舶大管轮
（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82题，每题1分，第83题至94题，每题1.5分。
一、单项选择题：
1.
Thereasonwhymoreandmoreofthelargemerchantvesselsarebeingpoweredbymedium-speeddieselenginesis.
A.
theyoperatebetween150and450rpm
B.
theyareconnectedtothepropellerbygearing
C.
theirsmallersizeandweight
D.
theycanbeconnecteddirectlytothepropellerwithoutgearing
2.
TheSMSshouldprovideforspecificmeasuresaimedatpromotingtheofequipmentorsystems,thesuddenoperationalfailureofwhichmayresultinhazardoussituations.
A.
visibility
B.
ability
C.
reliability
D.
capability
3.
Ifallotherconditionssuchasbore,stroke,speed,andmeaneffectivepressuresareequal,atwo-stroke/cycledieselenginewilldevelopro_imately.
A.
thesameindicatedhorsepowerasafour-stroke/cycleengine
B.
twicetheindicatedhorsepowerasafour-stroke/cycleengine
C.
onehalftheindicatedhorsepowerasafour-stroke/cycleengine
D.
onepowerstrokeforeverytwocrankshaftrevolutions
4.
Thedesirablepropertiesofamarinefueloilshouldinclude.
A.
highflashpointandhighviscosity
B.
lowflashpointandhighviscosity
C.
lowheatingvalueandhighsulphurcontent
D.
highheatingvalueandlowsulphurcontent
5.
Theplungerinajerkpumpisrotateduntilthereleaseportisuncovered.
Iftheportremainsuncoveredallofthetime,whichofthelistedoperationswilloccur?
A.
Nofuelwillbedelivered.
B.
Thema_imumeffectivestrokewillbeattained.
C.
Thefueldeliveredtothecylinderwillbee_cessive.
D.
Theinjectionnozzlewilloverheatandcarbonize.
6.
Inanenginewithapot-shapedpiston,somelubricatingoilfromthemainbearingwillpassalongadrilledpassageinthecrankshafttothebottomendbearingandthenupaconnectionrodtothe.
A.
crosshead
B.
crankpin
C.
crankjournal
D.
gudgeonpin
7.
Duetoactionofpistonssomerelativemotionbetweenpartsincontactinthecoolantsupplyandreturnsystemmustoccur.
A.
reciprocating
B.
rotating
C.
running
D.
removing
8.
Whatisthefunctionoftheafter-coolersinstalledinthedieselengineairintakesystem?
A.
Decreasetheairdensity
B.
Increasethee_hausttemperature
C.
Decreasethelubeoiltemperature
D.
Increasetheairdensity
9.
Dieselenginesarestartedbysupplyingintothecylindersintheropriatesequencefortherequireddirection.
A.
coolingwater
B.
pressingair
C.
pressedair
D.
cylinderoil10.
Ifthepensatingneedlevalveofahydraulicgovernorisopenedmorethannecessarythegovernorwill.
A.
havealargerthannormaldeadband
B.
producee_cessivespeedresponsetoaloadchange
C.
respondslowlytoanychangeinengineload
D.
stabilizeenginespeedatthenewgovernorsetting
11.
Byparingthee_haustgastemperatureofeachcylinder,theoperatorcandetermineiftheloadisbalancedthroughouttheengine.
Thedevicemostmonlyusedisa.
A.
tachometer
B.
pyrometer
C.
dynamometer
D.
calorimeter
12.
Themostcrucialtimeforanybearingwithregardstolubricationis.
A.
duringlowloads
B.
afterproperoilviscosityisreached
C.
duringstarting
D.
aftercleaningfilters
13.
Formostdieselpropulsionandgeneratorengines,theover-speedtripdevicewillstheengineby.
A.
movingthegovernorcontroltos
B.
shuttingoffthelubricatingoilsupply
C.
trippingthegovernoremergencyslever
D.
shuttingoffthefuelsupply
14.
Foracontinuousoperationdieselengine,aduple_filterunitwouldbethebestarrangementbecause.
A.
changingfilterelementswouldnotinterruptengineoperation
B.
filteringoccurstwiceineachpassofoilthroughthesystem
C.
cloggingwillnotoccur
D.
droppingpressureishalfofthatthroughasinglefilterunit
15.
Acrackinacylinderlinercanbecausedby.
A.
wornpistonrings
B.
installationofundersizedsealingrings
C.
operatingtheengineatlowloads
D.
restrictedcoolingwaterpassages
16.
Lowpressioninadieselenginecouldbecausedby.
A.
wornorbrokencylinderlinersealingrings
B.
highcoolingwatertemperature
C.
wornorbrokenpistonrings
D.
lowfueloilpressure
17.
Ifyoususpectadieselengineismisfiringduetoairleakageintothefuelsystem,youshouldbeginlookingfortheleakatthe.
A.
fuellineconnectionstothecylinderinjectionvalves
B.
gasketsurfacesofthefueloilfilters
C.
dischargefittingsofthefuelinjectorpumps
D.
suctionsideofthefueloiltransferpump
18.
Iffuelinjectiontoafour-stroke/cycledieselenginebeginsearlierthandesigned,ignitionmaybedelayedbecausethe.
A.
cylinderpressionpressuremaynotbehighenough
B.
cylinderpressiontemperaturemaybetoohigh
C.
fueloilinjectionpressuremaynotbehighenough
D.
scavengeandpurgeprocessisinplete
19.
Themainpropulsiondieselcontinuesrunningafteryoutrytoshutdown.
Youshouldnowattemptto.
A.
sthefueloilboosterpump
B.
engagethejackinggear
C.
securethelubeoilpump
D.
shutoffthefuelatthesettlingtank
20.
Ifanau_iliarydieselenginecoolanttemperatureishigherthannormal,butthethermostatisdeterminednottobedefective,youwouldsuspecta/an.
A.
cavitationerosioninthewaterjackets
B.
e_cesscorrosioninhibitorinthecoolant
C.
dirtyjacketwatercooler
D.
defectiveturbocharger
21.
Crankcasee_plosionsinpropulsiondieselenginesresultfrom____.
A.
thesplashingoflubricationoilbythecrankshaft
B.
thedilutionofcrankcaseoilwithparticlesofbustion
C.
brokenfuellinessprayingoilonthecrankcase
D.
theignitionofunburnedfuelandairinthecrankcase
22.
Iftheenginedoesnotstartonair,itmaybedueto.
A.
lowpressionofthefuelpumps
B.
incorrecttimingoffuelpumps
C.
thestartingairvalvesstuck
D.
air-locksinfueloilpipeline.
23.
Ifsomeofthecylindersarenotfiring,theonesaffectedmaybedeterminedbywatching.
A.
thee_hausttemperature
B.
thee_haustpressure
C.
thegovernor
D.
thefuelflowmeter
24.
Whentransmittedbyareductiongear,dieselenginespeedisreducedandthetorqueavailableforwork.
A.
remainsthesame
B.
isreduced
C.
isincreased
D.
iseliminated
25.
Athrustbearingisusedwithapropulsiondieselengineto____.
A.
controla_ialmovementofthecrankshaft
B.
transmitenginethrusttothepropellershaft
C.
absorbvibrationsinthepropellershafting
D.
preventpropellerthrustfrombeingtransmittedtothehull
26.
Propellerpitchspeedminusshipspeeddividedbythepropellerpitchspeedistermed___.
A.
arentslip
B.
trueslip
C.
pitch
D.
propulsiveefficiency
27.
Coldweatherstartingofadieselengineismoredifficultthanwarmweatherstartingdueto.
A.
useoflowviscosityoilincoldweather
B.
increasedmoisturecontentofinletairincoldweather
C.
increaseddragofpistonsandbearingsduetoincreasedoilviscosity
D.
higherpressionpressuresreachedduetosmallerclearancese_istingintheengineduringcoldweather
28.
Whilesailinginballastundernormalweatherandseacondition,thebasicparameterwhichisusedtorestrictthefuelinjectionofmainengineis.
A.
thee_hausttemperature
B.
thespeedofmainengine
C.
theturbinerotationspeed
D.
thepowerofmainengine
29.
Thebearingoftailshaftsealingequipmentwhichadoptstheoilnaturecirculationishot,thereasonis.
A.
therotatespeedfluctuation
B.
theventilationtubeclogged
C.
themainengineacceleratesofast
D.
stormywaves
30.
Moistureisremovedfromarefrigerationsystemby.
A.
bleedingrefrigerantfromthecondenser
B.
openingadrainpetcockontheoilseparator
C.
condensingthewaterintheheate_changer
D.
usingadehydratorcartridge
31.
Whencheckingzincplatesintherefrigeratingsystemcondenser,youshould.
A.
paintandinsulatetheplatestopreventcorrosion
B.
renewtheplatesateachinspection
C.
replacethezincsifdeterioratedby50
D.
filetheplatestochangethenegativevalue
32.
Whenreplacingathermostatice_pansionvalvesensingbulb,itisnecessaryto.
A.
lyalightfilmofoiltoincreaseheattransfer
B.
lyalightfilmofoiltoprevento_idation
C.
lyaheavycoatingofgreasetofunctionasaheatsink
D.
carefullycoatthedevicewithsiliconesealanttoreducetheeffectsofconvectivecooling
33.
Iftherefrigerationpressorcrankcaseissweating,thecausemaybedueto.
A.
ashortageofrefrigerant
B.
thepressorrunningcontinuously
C.
liquidrefrigerantreturningtothepressor
D.
thepressorshortcyclingonthehighpressurecutout
34.
Ifarefrigerationpressorisshortcyclingonhighheadpressure,youshould.
A.
purgethecondenserifthewatersideisdirty
B.
checkforproperwaterflowthroughthecondenser
C.
increasethehighpressurecutoutsetting
D.
reducethecoolingwaterflow
35.
Iftheheadpressureofareciprocatingrefrigerationpressorise_cessive,.
A.
thereliefvalveshouldopenbeforethehighpressurecutout
B.
thereliefvalveshouldopenandallowthee_cessrefrigeranttoflowtothereceiver
C.
thehighpressurecutoutswitchshouldoperatebeforethereliefvalveopens
D.
youshouldclosethedischargingvalve
36.
Whichfactordeterminestheringdamsizeforafueloil,tubularbowltype,centrifugalpurifier?
A.
Theviscosityofthefuel.
B.
Thequantityofwatertoberemovedfromthefuel.
C.
Thespecificgravityofthefuel.
D.
Thequantityofdirttoberemovedfromthefuel.
37.
Ifthebowlofadisktyp
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