轮机英语三管轮英语试题 制冷Word格式.docx
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A.releaseB.absorbC.developD.regenerate
1294.Afluidcoilwill_____largequantifiesofheatwhenitchangesstatefrom
avaportoaliquid.
1295.Thelatentheatofevaporationisdissipatedinthe_____inacompression
refrigerationsystem.
A.evaporatorB.condenserC.expansionvalveD.compressor
1296.Arefrigerantboilsandvaporizesinthe_____inacompressionrefrigerationsystem.
A.liquidreceiverB.compressorC.condenserD.coolingcoil
1297.Arefrigerantgivesupheatwhenitgoesthrough_____.
A.condenserB.regurgitateC.evaporatorD.boilcoil
1298.Itshouldbeensuredthatonly_____vaporishandledbytherefrigerationcompressor.
A.humidityB.dryC.steamD.oil
l299.Intherefrigerationcompressorthetemperatureofthevaporis_____bycompression.
A.raisedB.risenC.reducedD.maintainedconstant
1300.Ifthecapacityoftherefrigerationcompressoristoosmall,theexcess
vaporwillaccumulateintheevaporator,causingthepressureto_____.
A.riseB.fall
C.bemaintainedconstant
D.Noneoftheaboveistrue.
1301.Ifthecapacityoftherefrigerationcompressoristoolarge,thesaturation
temperaturewill_____.
A.riseB.fallC.bemaintainedconstantD.Noneoftheabove.
1302.Intheprocessof_____,liquidchangesintogas.
A.evaporationB.frostingC.condensingD.compressing
1303.Sinceheatwillnotflowfreelyfromabodyata_____temperatureto
anotherata_____temperature,itisnecessarytoexpendmechanicalwork,heat,
orelectricalenergyfromanexternalsourcetoachieverefrigeration.
A.lower/higherB.shallower/deeperC.larger/smallerD.higher/lower
1304.Inacompressionrefrigerationplanttherefrigerantflowsfromthe
expansionvalveandthroughthe_____whereitabsorbsheatfromthespace
beingcooledandbecomesagasorvapor.
A.compressorB.condenserC.throttlevalveD.evaporator
1305.The_____compressoranditselectricalmotorareentirelyhousedinagas-tightcasing.
A.open-typeB.hermeticC.AandBD.Noneoftheabove.
1306.Boththetemperatureandthepressureoftherefrigerantareincreasedinthe_____.
A.compressorB.condenserC.evaporatorD.expansionvalve
1307.Thecompressorsuctionlineconveystherefrigerantvaporfrom_____to_____.
A.condenser/evaporatorB.evaporator/compressor
C.compressor/condenserD.Noneoftheabove.
1308.Thethermalexpansionvalvecontrolstheamountofrefrigerantthatis
allowedtoflowtothe_____.
A.compressorB.coolingcoilsC.condenserD.receiver
1309.Whenthetemperatureoftherefrigerantflowingoutfromthecondenseris
belowthecondensingtemperature,itissaidtobe_____.
A.dryB.wetC.super-cooledD.superheated
1340.Duringworking,thermostaticexpansionvalveshouldbe_____.
A.eitherallthewayopenorallthewayclosedB.normallyfullyopen
C.throttleddependingonloadD.controlledbyliquefiedpressure
1341.TheexpansionvalveonaFreonsystemcontrolsthe_____.
A.superheatofthegasleavingthecompressor
B.backpressureintheevaporator
C.temperatureoftheicebox
D.superheatofthegasleavingtheevaporator
1342.Afeelerorthermalbulbisusedfortheexpansionvalveto_____.
A.detectthetemperatureB.detectthepressure
C.heattherefrigerantD.acceleratetherefrigerant
1343.Inacompressionrefrigerationplanttherefrigerantisunderlowpressure
inthe_____andunderhighpressureinthe_____.
A.compressor/condenserB.condenser/evaporator
C.throttlevalve/evaporatorD.evaporator/condenser
1344.Theboilingandcondensationpointsofrefrigerantmainlydependon
the_____exerteduponit.
A.temperatureB.densityC.volumeD.pressure
1345.Thefunctionof_____inarefrigerationplantusingFreonistomove
moisturefromallrefrigerationsystem.
A.filterB.filterdrierC.heatexchangerD.aircooler
1346.Thesaturationtemperatureoftherefrigerantmustbe_____thatrequired
intheevaporatorrefrigeratedspace.
A.aboveB.belowC.equaltoD.Noneoftheabove.
1347.Afterpassingthroughtheexpansionvalvetherefrigerantshouldbeinthestateof_____.
A.vaporB.liquidC.solidD.Noneoftheaboveistree.
1348.Therefrigerantflowsthroughtheevaporator,whereit_____heatfromthe
refrigeratedspace.
A.extractsB.releasesC.givesnoD.absorbsno
1349.Inpractice,therefrigerantflowaftertheevaporatorisdesignedtoensure
thatthevaporleavingtheevaporatorisslightly_____.
A.saturatedB.super-cooledC.wetD.superheated
1350.Whichofthefollowingwillbedesirablepropertiesofrefrigerant?
(1)non-explosive;
(2)non-corrosive;
(3)thatitdoesn'
treactwithlubricants
A.
(1),
(2)and(3)B.
(1)and
(2)C.
(1)and(3)D.
(2)and(3)
1351.Inthe_____refrigerationcompressoroneendofthecrankshaftextends
throughthecrankcasehouseforconnection,viaacouplingorpulley,toan
externaldrivemotor.
A.open-typeB.hermeticC.semi-hermeticD.alltheabove
1352.Inacompressionrefrigerationplantthehot,highpressurerefrigerantgas
iscooledbytheseawaterandbecomesliquidinthe_____.
1353.Whatisthefunctionofthermostaticexpansionvalveinacompression
Refrigerationsystem?
A.nonexistentB.forcontrollingpressure
C.forcontrollingsuperheatD.forcontrollingthesolenoidvalve
1354.Inavaporcompressionrefrigerationtheevaporatingpressureis
maintainedconstantbytheactionofthe_____,whichremovesvaporfromthe
evaporatoratthesamerateatwhichitisformed.
A.evaporatorB.compressorC.condenserD.noneoftheabove
1355.Thedeviceusedforlow-pressurecontrolandhigh-pressurecutoutona
compressoriscalled_____.
A.cutoutB.controllerswitch
C.pressurecontrollerD.cutoutswitch
1356.Whichofthefollowingmaycausethatthecompressorcutsoffonhigh
Pressurecutoutinarefrigerationplant?
(1)faultycondensing;
(2)toofew
refrigerant;
(3)highdischargepressure;
A.anyof
(1)and(3)B.anyof
(1)and
(2)
C.anyof
(2)and(3)D.anyof
(1),
(2)and(3)
1357.Whichofthefollowingmaycausethatexcessivelywarmwaterleavesthe
condenserinarefrigerationplant?
(1)toolittlecoolingwater;
(2)toomuch
coolingwater;
(3)toowarmcoolerwater.
A.
(1)onlyB.anyof
(1),
(2)and(3)
C.anyof
(1)and(3)D.anyof
(1)and
(2)
1358.Thepresenceofairinthecondenserofarefrigerationsystemwill_____
thecondensingpressure.
A.increaseB.reduce
C.maintainconstantD.Noneoftheaboveistrue.
1359.Whichofthefollowingbestdescribes"
overchargeofrefrigerant"
?
A.Toomuchrefrigerant.
B.Toolittlerefrigerant.
C.Refrigerantisranout.
D.Runningisover.
1360.Whatseparatethehighpressuresidefromthelowpressuresideinarefrigerationsystem?
A.Condenserandthermalexpansionvalve.B.Kingandsolenoidvalves.
C.Compressorandthermalexpansionvalve.
D.Condenserandsolenoidvalve.
1361.MoistureshouldbekeptoutofanR-12systembecauseittendstocause_____.
A.icingoftheautomaticcontrols
B.embittermentofsomepartsoftheautomaticcontrols
C.sludgeinthelubricatingoil
D.alloftheabove
1362.Airthatmayenterarefrigerationplanttendstocollectinthe_____.
A.upperpartofthereceiverB.upperpartofthecondenser
C.downstreamendofthecoolingcoilD.outletendofthecondenser
1363.Insufficientrefrigerantinarefrigerationplantmayresultin_____.
A.highdischargepressureB.frostingofthecrankcase
C.hightemperatureoftheoverboardwater
D.lowsuctionpressureofcompressor
1364.WhichwillcausethehighpressurecutouttostopthecompressorinaR-22system?
A.Condenserleakage
B.Ashortageofliquidrefrigerant
C.Excessivefrostontheevaporator
D.Notenoughcondensercoolingwater
1365.Aruptureddiaphragminathermostaticexpansionvalvewillcausethevalveto_____.
A.openB.close
C.remaininitsposition
D.floodtheevaporatorwithrefrigerant
1366.Ifliquidrefrigerantaccidentallycomesincontactwiththeeyes,_____immediately.
A.rubtheeyesB.irritatetheeyes
C.washtheeyeswithaheavyboricacidsolutionD.obtainmedicalhelp
1367.Shouldapersonbeovercomeduetolackofoxygenandhigh
concentrationofrefrigerant,treatwith_____.
A.freshwaterB.freshairC.saltwaterD.artificialrespiration
1368.Excessivelywarmwaterleavingcondensermaybecausedby
A.fouledtubesinshellandtubecondenser
B.toolittleortoowarmcondenserwater
C.airornon-condensablegasinsystem
D.overchargeofrefrigerant
1369.Theinnerpartofthecondensershouldbecleanedwith_____.
A.gasoilB.dieseloilC.chemicalcompoundD.Freon-12
1370.Freon12w