更多"Refrigerant is circulated through a"的相关试题:
[单项选择]As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into （）.
A. liquid
B. oily mixture
C. emulsion
D. vapor
[单项选择]The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.
A. extracts
B. releases
C. gives no
D. absorbs no
[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]Insufficient refrigerant in a refrigeration plant may result in （）.
A. high discharge pressure
B. frosting of the crankcase
C. high temperature of the overboard water
D. low suction pressure of compressor
[单项选择]A pressure drop through the refrigerant liquid line may cause （）.
A. solenoid valve to seize
B. compressor to hunt
C. formation of flash gas in the liquid line
D. expansion valve to freeze open
[单项选择]A refrigerant gives up heat when it goes through （）.
A. condenser
B. regurgitate
C. evaporator
D. boil coil
[单项选择]The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.
A. above
B. below
C. equal to
D. None of the above
[单项选择]If liquid refrigerant accidentally comes in contact with the eyes, （） immediately.
A. rub the eyes
B. irritate the eyes
C. wash the eyes with a heavy boric acid solution
D. obtain medical help
[单项选择]The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it.
A. temperature
B. density
C. volume
D. pressure
[单项选择]Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
A. Sub-cooled liquid
B. Sub-cooled vapor
C. Superheated vapor
D. Liquid
[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]If the refrigeration compressor crankcase is sweating, the cause may be due to （）.
A. a shortage of refrigerant
B. the compressor running continuously
C. liquid refrigerant returning to the compressor
D. the compressor short cycling on the high pressure cutout
[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]Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.
A. face shield
B. a respirator
C. rubber gloves
D. an all purpose gas mask
[单项选择]If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be （）.
A. excessive condenser cooling water
B. warm food in the refrigerator
C. a shortage of refrigerant
D. s shortage of compressor oil
[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]In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.
A. evaporator
B. compressor
C. condenser
D. none of the above
