轮机英语三管轮英语试题 制冷Word格式.docx

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_____.

A.compressorB.condenserC.throttlevalveD.evaporator

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.Freon12whichisusedtoproduceintens