A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
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A.increases brine density
B.increases distillate salinity
C.reduces metal corrosion
D.reduces heat transfer
A.positive head
B.negative suction head
C.mechanical seal
D.vent valve attached to the casing at the top of the volute
A.gate valve
B.globe valve
C.check valve
D.plug cock
A.At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B.The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C.The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D.The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
A.diaphragm type gage
B.pressure transducer
C.manometer
D.All of the above
最新試題
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Thermostatic expansion valves can be adjusted for （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
A salinity indicator is used to determine the （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.