轮机英语三管轮英语试题制冷

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1、Lesson13制冷1288-Theinnerpartofthecondensershouldbecleanedwith.A.gasoilB.dieseloilC.chemicalcompoundD.Freon-121289.TheevaporatingpressureinR22vaporcompressionrefrigerationplantshouldbeatmospheric.A.belowB.aboveC.equaltoD.muchlargerthan1290.Hotgasdefrostin

2、gusesthehotgasfromtodefrosttheevaporato匚A.startingairbottlesB.dieselenginesC.boilersD.refrigerationcompressors1291.Inarefrigerationplanttheneeddefrosting.A.fanB.compressorC・condenserD.evaporator1292.Whatisthesubstancecalledwhichcanreadilybeconvertedfrom

3、aliquidintoavapor,andalsofromavaporintoliquidwithareasonablynarrowrangeofpressure?A.RefrigeratorB.RefrigerantC.CoolingmediumD.Brine1293.Afluidcoilwilllargequantifiesofheatwhenitchangesstatefromaliquidtoavapo匚A.releaseB.absorbC.developD.regenerate1294.Af

4、luidcoilwilllargequantifiesofheatwhenitchangesstatefromavaportoaliquid.A.releaseB.absorbC.developD.regenerate1295.Thelatentheatofevaporationisdissipatedintheinacompressionrefrigerationsystem.A.evaporatorB.condenserC.expansionvalveD.compressor1296.Arefri

5、gerantboilsandvaporizesintheinacompressionrefrigerationsystem.A.liquidreceiverB.compressorC.condenserD.coolingcoil1297.Arefrigerantgivesupheatwhenitgoesthrough.A.condenserB.regurgitateC.evaporatorD.boilcoil1298.Itshouldbeensuredthatonlyvaporishandledbyt

6、herefrigerationcompressor.A.humidityB.dryC.steamD.oil1299.Intherefrigerationcompressorthetemperatureofthevaporisbycompression.A・raisedB.risenC.reducedD.maintainedconstant1300.Ifthecapacityoftherefrigerationcompressoristoosmall,theexcessvaporwillaccumula

7、teintheevaporator,causingthepressureto•A.riseB.fallC.bemaintainedconstantD.Noneoftheaboveistrue.1289.Ifthecapacityoftherefrigerationcompressoristoolarge,thesaturationtemperaturewill・A.riseB.fallC.bemaintainedconstantD.Noneoftheabove.1290.Intheprocessof,

8、liquidchangesintogas.A.evaporationB.frostingC.condensingD.compressing1291.Sinceheatwillnotflowfreelyfromabodyatatemperaturetoanotheratatemperature,itisnecessarytoexpendmechanicalwork,heat,orelectricalenergyfromanexternalsourcetoa