轮机英语真题42期 甲类三管轮.docx
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轮机英语真题42期甲类三管轮
轮机英语真题42期甲类三管轮
中华人民共和国海事局
20__7年第1期海船船员适任证书全国统考试题（总第42期）
科目：
轮机英语试卷代号：
805
适用对象：
无限、近洋航区3000KW及以上船舶二/三管轮
（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74题，每题1分，第75题至78题，每题1.5分,第79题至80题,
每题10分。
一、单项选择题
1.The______engineisusedforalternatorsandsometimesformainpropulsionwithagearbo_to
provideapropellerofbetween90to120rpm.
A.
four-stroke
B.
two-stroke
C.
slowspeed
D.
reversible
2.Thedischargeflowofareciprocatingpumpis______.
A.
steady
B.
inpulsation
C.
continuous
D.
large
3.Thecetanenumberofadieselfueloilindicatesits______.
A.
viscosity
B.
acidcontent
C.
heatingvalue
D.
ignitionquality
4.Alwaysensurethattheturninggearis______,evenatthequay,thewavefromothershipsmay
turnthepropellerandthustheengine.
A.
disengaged
B.
engaged
C.
assembled
D.
disassembled
5.Camshaftsareusuallydrivenbytiminggearsor______.
A.
pushrods
B.
chaindrives
C.
rockerarms
D.
flywheels
6.Thecylinderoilispumpedintothecylinder（vianon-returnvalves）whenthepistonringspassthe
lubricatingorifices,during______.
A.
theupwardstroke
B.
thedownwardstroke
C.
thepowerstroke
D.
thesuctionstroke
7.Thetotalstartingaircapacityrequiredforreversiblemainenginesistobesufficientforaleast
______.
A.
si_consecutive（连续的）starts
B.
eightconsecutivestarts
C.
tenconsecutivestarts
D.
twelveconsecutivestarts
8.
Adirtydieselengineoilfilterelementcanbestbedetectedby______.
A.
visualinspectionoftheelements
B.
thepressuredropacrossthefilter
C.
highlubeoilsumptemperature
D.
decreaseinoilviscosityfromthefilter
9.Beforeamarinedieselengineisstartedthecylindersandpistonsmustbe______.
A.
cooledtoropriatetemperature
B.
warmedupgraduallytoropriatetemperature
C.
openedupandrenewed
D.
groundandpolished
10.
Acontrollablepitchpropelleronadieseldrivenvesseleliminatestheneedfor______.
A.
frictionclutches
B.
disconnectclutches
C.
reversinggears
D.
reductiongears
11.Thema_imumpressuredevelopedbyawasteheatboilerisdeterminedbythemainengine
e_haust______.
A.
gasposition
B.
gastemperature
C.
pressure
D.
timing12.______continuouslye_tractthecrankcaseatmosphere,viaapipesystem,andmoveitpasta
sensitiveandaccurateopacity（不透明）measuringtrack.
A.
Theoilmistdetectors
B.
Thesmokedetectors
C.
Anoilywatermonitor
D.
Oildischargemonitoringandcontrollingsystem
13.Thewaterinaingau_iliaryboilershouldbetesteddailyfor______.
A.
dissolvedo_ygen
B.
chlorides
C.
sludge
D.
dissolvednitrogen
14.
Afirebo_e_plosioninanautomaticallyfiredau_iliaryboilermaybetheresultof______.
A.
e_cessivepurgingbeforelightingoff
B.
insufficienttrailforignitionperiod
C.
afaultytransformerintheignitioncircuit
D.
insufficientpurgingafterlightingoff
15.
Afeedpumpforanau_iliaryboilermightlosesuctionifthe______.
A.
boilerwaterlevelislow
B.
feed-wateristoohot
C.
boilerdemandislow
D.
feed-wateristoocold
16.Thegearandscrewpumpsareclassifiedas______.
A.
variablestrokepumps
B.
multistagepumps
C.
positivedisplacementpumps
D.
triple-portedpumps
17.Thepressureofaliquidleavingthepumpcanbereferredtoasthe______.
A.
totalhead
B.
dischargehead
C.
positivesuctionhead
D.
suctionhead
18.Whichofthevalveslistedwillbecycledfromfullyopentofullyclosedwhenthehandleis
turned90degree?
A.
Arisingstemgatevalve
B.
Aglobesvalve
C.
Acheckvalve
D.
Abutterflyvalve
19.
Apumpshaftthatisbentordistortedshouldnormallybe______.
A.
repairedbyasuitableweldingprocess
B.
straightenedbylyingheatandtorsion
C.
reconditionedbymetallizingandmachining
D.
replacedwithasatisfactoryspare
20.
Acentrifugalpumpmayfailtodeliverwaterwhenfirststartedifthe______.
A.
watersealpipeisplugged
B.
pumpisnotprimed
C.
sealringisimproperlylocated
D.
impellerisflooded
21.Whichofthefollogconditionsmuste_istforheattoflowfromoneobjecttoanother?
A.
Thetwoobjectsmustbeinphysicalcontact.
B.
Thetwoobjectsmustbethesamesize.
C.
Theremustbeane_istingtemperaturedifferential.
D.
Theremustbeane_istingweightdifferential.
22.Thedewpointofairisreachedwhenthewetbulbtemperatureis______.
A.
twicethedrybulbtemperature
B.
10℃abovethedrybulbtemperature
C.
5℃abovethedrybulbtemperature
D.
equaltothedrybulbtemperature
23.Ifairat95℃drybulbtemperatureand50relativehumidityisconditionedto75℃drybulb
temperatureand50relativehumidity,itisane_leof______.
A.
coolingonly
B.
coolingandhumidifying
C.
coolinganddehumidifying
D.
adiabatic（绝热的）cooling
24.Inordertoachievegreaterdehumidification（除湿）withanairconditioningsystem,youshould
______.
I.
reducethecoolingcoiltemperatureII.
increasethere-heatertemperature
A.
Ionly
B.
IIonly
C.
BothIandII
D.
NeitherInorII
25.Oilywaterseparatorsareusedtoensurethatshipsdon"tdischargeoilwhenpumpingout______.
A.
ballastwater
B.
boilerwater
C.
bilgewater
D.
sewagewater
26.Whenstarted,apleteoilywaterseparatingunitisfirstfilled______.
Theoilywatermi_ture
isthenpumpedthroughtheinletpipeintothecoarseseparatingpartment.
A.
withdirtywater
B.
withcleanwater
C.
byoilywater
D.
bymi_edwater
27.Whichisthepollutionpreventionequipment?
A.
boosterpump
B.
evaporator
C.
incinerator
D.
cooler
28.Theoilsludgeisburntinthe______onboard.
I’llshowyoutheashes.
A.
boiler
B.
mainengine
C.
au_iliaryengine
D.
incinerator
29.Mostmarinebiologicalsewagetreatmentplantsconsistofallthefollogstatementse_cept
______.
A.
aerationtanks
B.
settlingtanks
C.
disinfectionagent
D.
anaerobicbacteria（厌氧菌）
30.Greatcareisdedicatedtotheremovalof_____
fromthescavengeair.
A.
gravity
B.
viscosity
C.
density
D.
humidity
31.Dirtyoilmustbe_____
beforebeingusedagain.
A.
mi_edwithcleanoil
B.
purified
C.
heated
D.
strained
32.Whenavacuumboilingevaporatorworks,thehotjacketwaterwillpassoverthetubestackand
___
theseawaterpassingthroughthetubes.
A.
dispose
B.
dissolve
C.
heat
D.
dissipates
33.Whensecuringaflash-typeevaporatorforane_tendedperiodoftime,youshould______.
A.
filltheunitwithsaltwater
B.
filltheunitwithdescalingpound
C.
pletelydraintheunit
D.
tightlysealtheunittoe_cludeair
34.Amongthebasiccategoriesofequipment,whichofthefollogareusedtoallowthehydraulic
energytobecontrolled?
A.
hydraulicpumps
B.
valves
C.
hydrauliccylinders
D.
hydraulicmotors
35.Positivedisplacement,helicalgear（斜齿轮）pumpsarewellsuitedforpumpingoilbecause
______.
A.
stuffingbo_eseliminatetheleakageproblemsusuallyassociatedwithothergearpumps
B.
itisnotnecessarytocloselymaintaindesignclearanceswiththispump
C.
theyareessentiallyself-primingandproduceahighsuctionlift
D.
thesepumpsaredesignedwithe_tremetoothangles
36.Theoilinacargochgearbo_shouldbesledperiodically（周期性地）to______.
A.
preventthegearbo_fromleaking
B.
preventtheoilfrombeinginflammable（易燃的）
C.
makesureithasnotbeecontaminated（污染）
D.
makesurethemotorbearingsarelubricated
37.Ifananchordlasshasbeenidleforsometime,youshould______.
A.
repackallvalvestems
B.
lubricateitpriortouse
C.
replacethefoundationbolts
D.
balancethewarpingheads38.
Amooringchshouldbeequippedwithmechanicalbrakescapableofholding______.
A.
halfthebreakingstrengthofthemooringline
B.
thefullbreakingstrengthofthemooringline
C.
thema_imume_pectedtension（张力）ofthemooringline
D.
50overtheworkingtensionofthemooringline
39.Hydrauliccranesmustbeproperlywarmed-upbeforebeingoperatedbecause______.
A.
warm-upallowsthehydraulicsystemtobeechargedwithoil
B.
warm-upallowsthereliefvalvestobeproperlytested
C.
hydraulicstrainersoperateonlyduringthewarm-upperiod
D.
hydraulicfluidmustbeattheproperviscosity
40.Thecurrentflogfirstinonedirectionandtheninanotheriscalled____
current.
A.
arush
B.
analternating
C.
adirect
D.
ane_citing
41.ThefrequencyofanalternatoratagivenRPMisdeterminedbythe______.
A.
numberofturnsofwireinthearmaturecoil
B.
numberofmagicpoles
C.
strengthofthemagsused
D.
outputvoltage
42.WhileparallelingtwoACgeneratorsusingsynchronizing（同步的）lsonly,bothlswill
godarkwhenthegeneratorsare______.
A.
runningatthesamespeed
B.
grounded
C.
ofthesamepolarity（极性）
D.
inphase
43.Theloadsharingcharacteristicsoftwodieselgeneratorsoperatinginparallelaremostly
dependentontheirgovernor______.
A.
loadlimitsettings
B.
idlespeedsettings
C.
speedlimitsettings
D.
speeddroopsettings
44.Electricinsulationismadeoforganicsubstancesandsogradually______withage.
A.
deteriorates
B.
increases
C.
arefouled
D.
beesbetter
45.Themaingeneratorsareconnectedto______.
A.
distributionboards
B.
sectionboards
C.
emergencyswitchboards
D.
mainswitchboards
46.Theoperationof_____
twoalternatorsrequiresthevoltagestobeequalandalsoinphase.
A.
control
B.
series-mounting
C.
running
D.
paralleling
47.______isamachinebywhichelectricalenergyistransformedintomechanicalenergy.
A.
Analternator
B.
Anelectricmotor
C.
Adieselengine
D.
Amainswitchboard
48.
Agroundinanelectrical
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