单项选择题
A centrifugal compressor’s purge recovery unit（）
A.reclaims water
B.purges air without losing refrigerant
C.purges air with some loss of refrigerant
D.purges lube oil from the refrigerant
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相关考题
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单项选择题
The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）
A.re-evaporator
B.receiver
C.dehydrator
D.solenoid -
单项选择题
The humidity of the atmosphere can be determined by the use of the（）
A.anemometer
B.potentiometer
C.manometer
D.psychrometer -
单项选择题
In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）
A.opening more bypass lines
B.opening additional expansion valves
C.adding refrigerant
D.speeding up the machine
