單項(xiàng)選擇題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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2.單項(xiàng)選擇題The humidity of the atmosphere can be determined by the use of the()

A.anemometer
B.potentiometer
C.manometer
D.psychrometer

3.單項(xiàng)選擇題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

5.單項(xiàng)選擇題If a compressor runs continuously, the cause might be a()

A.defective thermal bulb
B.clogged scale trap
C.stuck high-pressure switch
D.stuck low-pressure switch