更多"Air entering an air-cooled refriger"的相关试题:
[单项选择]Refrigeration system compressor crankcase sweating is an indication of （）.
A. insufficient lube oil circulating through the system
B. excessive circulation of lube oil through the system
C. insufficient refrigerant in the system
D. an overworked compressor
[单项选择]A refrigeration system contaminated with moisture can be affected by （）.
A. acid formation
B. sludge formation
C. ice in the expansion valve
D. All of the above
[单项选择]A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
A. a shortage of refrigerant in the system
B. air in the system
C. an accumulation of liquid refrigerant in the crankcase
D. a shortage of oil in the crankcase
[单项选择]Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）
A. Expansion valve
B. Condenser
C. Evaporator
D. Compressor
[单项选择]The refrigeration system low pressure cutout switch is actuated by （）.
A. an electric system manager
B. a sensing bulb at the tail coil of the evaporator
C. pressure changes in the suction line
D. failure of the king solenoid valve
[单项选择]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 adjustment
B. readjust the water regulating valve to increase the flow of water
C. purge air from the condenser
D. clean the waterside of the condenser
[单项选择]If a refrigeration system compressor crankcase is sweating, you should （）.
A. add refrigerant to the system
B. adjust the thermal expansion valve to the proper setting
C. adjust the float valve to the proper holding pressure
D. open the hand expansion valve
[单项选择]Sweating of the refrigeration system compressor crankcase is caused by （）.
A. too much superheat
B. insufficient superheat
C. suction pressure too low
D. excessive refrigerant returning to the compressor
[单项选择]The presence of bubbles in a refrigeration system liquid line may （）.
A. promote refrigerant dehydration
B. be absorbed in the receiver
C. cause low condensing pressure
D. carry moisture and lead to corrosion
[单项选择]In which of the listed refrigeration system components does superheating of the refrigerant take place?（）
A. Expansion valve
B. Evaporator
C. Drier
D. Receiver
[单项选择]The purpose of the refrigeration system low pressure cutout switch is to （）
A. protect the compressor from liquid flood back
B. protect the compressor from low discharge pressure
C. start and stop the compressor upon system demand
D. start the compressor after a drop in the evaporator pressure
[单项选择]Moisture is removed from a refrigeration system by（）.
A. bleeding refrigerant from the condenser
B. opening a drain petcock on the oil separator
C. condensing the water in the heat exchanger
D. using a dehydrator cartridge
[单项选择]In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）
A. be clear
B. be blue
C. be light green
D. show bubbles
[单项选择]In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.
A. compressor
B. condenser
C. receiver
D. evaporator
[单项选择]If a refrigeration system were short of refrigerant, the condition would result in （）.
A. continuous running of the compressor
B. high suction pressure
C. high discharge pressure
D. short cycling of the compressor on the water failure switch
[单项选择]Crankcase sweating in a refrigeration system is caused by （）.
A. a stuck solenoid valve
B. a shortage of refrigerant
C. too much oil in circulation
D. too much superheat
[单项选择]The low pressure side of a refrigeration system is considered to exist from the （）.
A. expansion valve to the compressor
B. receiver to the expansion coil
C. expansion valve to the evaporator
D. condenser to the expansion valve
[单项选择]The receiver used in a refrigeration system（）
A. stores liquid refrigerant
B. collects non-condensable gases
C. allows refrigerant sub-cooling
D. prevents compressor surging
