单选题Refrigerant enters the condenser as a （）.Ahigh pressure liquidBlow pressure vaporChigh pressure vaporDlow pressure liquid
单选题
Refrigerant enters the condenser as a （）.
A
high pressure liquid
B
low pressure vapor
C
high pressure vapor
D
low pressure liquid
参考解析
解析：
暂无解析
相关考题：
()throttlestheliquidrefrigerantandmaintainsthepressuredifferencebetweenthecondenserandtheevaporator。 A、TheexpansionvalveB、CompressorC、EvaporatorD、Condenser
Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )A.Shortage of refrigerant oilB.Slight shortage of refrigerantC.Excessive condenser cooling water flowD.Faulty expansion valve
If the superheat value of a thermostatic expansion valve is set too low, the _.A.the suction line will be abnormally cold and liquid may slug back to the compressorB.the suction line will be hot due to a reduced amount of refrigerant returning to the compressorC.the temperature of the refrigerant within the condenser will remain the sameD.the temperature of the refrigerant passing through the sub-cooler will decrease
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?A.A shortage of liquid refrigerant.B.Excessive frost on the evaporator.C.Excessive condenser cooling water.D.Insufficient condenser cooling water flow.
In a chilled(冷的) water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ______.A.increasing refrigerant pressure in the coilB.increasing chilled water flow through the coolerC.sub-cooling the refrigerant in the condenserD.superheating the refrigerant in the compressor
I undertake to bring to the notice of the Suez Canal Authorities，before my vessel ______ the Canal，any defects which may appear.A.enters intoB.entersC.enters inD.enters to
Fearing damage from either or both of the above incidents，the Master now ______ me this note of protest，reserving to himself the right to extend same at time and place convenient．A.entersB.enters intoC.enters withD.enters to
单选题Low compressor head pressure in a refrigeration system can be caused by（）.Ainsufficient condenser cooling waterBexcessive condenser cooling waterCair in the refrigeration systemDexcessive refrigerant in the system
单选题Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）AShortage of refrigerant oilBSlight shortage of refrigerantCExcessive condenser cooling water flowDFaulty expansion valve
单选题As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into （）.AliquidBoily mixtureCemulsionDvapor
单选题In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.Acompressor；condenserBcondenser；evaporatorCthrottle valve；evaporatorDevaporator；condenser
单选题In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes（）.Afresh waterBvaporCmixtureDliquid
单选题The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）Alatent heat of expansionBsensible heat of condensationCheat of compressionDall of the above
单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）ALatent heat of vaporizationBHeat of compressionCSuperheatDAll of the above
单选题Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.Amaintain adequate coil back pressureBprohibit flashing in the liquid lineCreduce refrigerant volume in the systemDreduce compressor discharge line loading
单选题If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.Atoo much refrigerant in the systemBoil entrained in the refrigerantCless than a full charge of refrigerant in the systemDice crystals forming in the refrigerant
单选题If the high-pressure switch on the compressor opens and stops the compressor a possible cause could be:（）Atoo much cooling water going through the condenserBnot enough refrigerant in the systemCa leak in the evaporator coilsDno enough cooling water going through the condenser
单选题If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.Aa shortage of compressor oilBwarm food in the refrigeratorCexcessive condenser cooling waterDa shortage of refrigerant
单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.Apassing it through the expansion valveBcondensing refrigerant in the system condenserCpassing the gaseous refrigerant through the heat interchanger on the suction side of the compressorDmaintaining a high pressure on the systems receiver
单选题The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）Aremove any air that may accumulate in the systemBtake out unpleasant fumes from the refrigerantCvent off excess refrigerant in an emergencyDpermit opening the refrigerating system for cleaning and inspecting
单选题In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.Aincreasing refrigerant pressure in the coilBincreasing chilled water flow through the coolerCsub-cooling the refrigerant in the condenserDsuperheating the refrigerant in the compressor
单选题Excessively warm water leaving condenser may be caused by（）Afouled tubes in shell and tube condenserBtoo little or too warm condenser waterCair or non-condensable gas in systemDovercharge of refrigerant
单选题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.AliquidBdry saturated gasCwet saturated gasDsuperheated vapor
单选题The thermostatic valve has a throttling action, that is to say the valve can（）Astop the refrigerant from flowingBforce the refrigerant to flowCcause the refrigerant pressure to riseDcause the refrigerant pressure to fall
单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.Achange the expansion valve adjustmentBreadjust the water regulating valve to increase the flow of waterCpurge air from the condenserDclean the waterside of the condenser
单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.Aincrease the amount of cooling water to the condenserBdecrease the amount of cooling water to the condenserCadd more refrigerant to the systemDremove some refrigerant from the system