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单选题
The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）
A
latent heat of expansion
B
sensible heat of condensation
C
heat of compression
D
all of the above
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The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.A.refrigerant pressure in the evaporatorB.cooling water temperature to the condenserC.heat load in the refrigerator compartmentD.solenoid valve in the liquid line
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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.
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The heat gained per pound of refrigerant in the evaporator is known as the ______.A.latent heat of vaporizationB.sensible heatC.refrigerating effectD.specific heat of vaporization
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单选题Low compressor head pressure in a refrigeration system can be caused by（）.A
insufficient condenser cooling waterB
excessive condenser cooling waterC
air in the refrigeration systemD
excessive refrigerant in the system
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单选题When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be （）.A
dryB
wetC
super-cooledD
superheated
考题
单选题Refrigerant enters the condenser as a （）.A
high pressure liquidB
low pressure vaporC
high pressure vaporD
low pressure liquid
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单选题The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.A
extractsB
releasesC
gives noD
absorbs no
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单选题What is the purpose of sub cooling R-12 in the condenser?（）A
to increase the system efficiency by sensible heat transferB
to stop the liquid from flashingC
to reduce the load on the compressorD
to remove latent heat of vaporization and the suction piping transfer
考题
单选题In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.A
compressor；condenserB
condenser；evaporatorC
throttle valve；evaporatorD
evaporator；condenser
考题
单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.A
compressorB
condenserC
receiverD
evaporator
考题
单选题The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）A
latent heat of expansionB
sensible heat of condensationC
heat of compressionD
all of the above
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单选题In a compression refrigeration plant the refrigerant flows from the expansion valve and through the （） where it absorbs heat from the space being cooled and becomes a gas or vapor.A
compressorB
condenserC
throttle valveD
evaporator
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单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）A
Latent heat of vaporizationB
Heat of compressionC
SuperheatD
All of the above
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单选题Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.A
maintain adequate coil back pressureB
prohibit flashing in the liquid lineC
reduce refrigerant volume in the systemD
reduce compressor discharge line loading
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单选题If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.A
a shortage of compressor oilB
warm food in the refrigeratorC
excessive condenser cooling waterD
a shortage of refrigerant
考题
单选题Moisture is removed from a refrigeration system by（）.A
bleeding refrigerant from the condenserB
opening a drain petcock on the oil separatorC
condensing the water in the heat exchangerD
using a dehydrator cartridge
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单选题The heat gained per pound of refrigerant in the evaporator is known as the（）.A
latent heat of vaporizationB
sensible heatC
refrigerating effectD
specific heat of vaporization
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
passing it through the expansion valveB
condensing refrigerant in the system condenserC
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD
maintaining a high pressure on the systems receiver
考题
单选题The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）A
remove any air that may accumulate in the systemB
take out unpleasant fumes from the refrigerantC
vent off excess refrigerant in an emergencyD
permit opening the refrigerating system for cleaning and inspecting
考题
单选题A condenser is a vessel in which（） is deprived of its latent heat of vaporization and so changed to its liquid state.A
sea waterB
fresh waterC
vapourD
gas
考题
单选题Excessively warm water leaving condenser may be caused by（）A
fouled tubes in shell and tube condenserB
too little or too warm condenser waterC
air or non-condensable gas in systemD
overcharge of refrigerant
考题
单选题A refrigerant gives up heat when it goes through （）.A
condenserB
regurgitateC
evaporatorD
boil coil
考题
单选题Early models of the flash-type evaporators used a separate shell-and-tube heat exchanger as the air ejector condenser.More recent models use a combined air ejector condenser with the（）A
distilling condenserB
salt water feed heaterC
distillate coolerD
flash chamber
考题
单选题The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the （）.A
condenserB
vapor generatorC
accumulatorD
evaporator
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单选题The thermostatic valve has a throttling action, that is to say the valve can（）A
stop the refrigerant from flowingB
force the refrigerant to flowC
cause the refrigerant pressure to riseD
cause the refrigerant pressure to fall
考题
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 （）.A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
purge air from the condenserD
clean the waterside of the condenser
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