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單項選擇題

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

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單項選擇題

Air that may enter a refrigeration plant tends to collect in the （）.

A.upper part of the receiver
B.upper part of the condenser
C.down stream end of the cooling coil
D.outlet end of the condenser

單項選擇題

Moisture should be kept out of an R-12 system because it tends to cause （）.

A.icing of the automatic controls
B.embrittlement of some parts of the automatic controls
C.sludge in the lubricating oil
D.all of the above

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