單項選擇題

Excessive scale formation in a distilling plant may result from （）.

A.poor distillate quality
B.reduced evaporator capacity
C.low brine concentration
D.improper vacuum regulation

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Foaming of the oil in a refrigeration compressor crankcase is caused by （）.

A.refrigerant boiling out of solution from the lube oil
B.liquid refrigerant flooding the compressor and system
C.lube oil viscosity being reduced by refrigerant dilution
D.compressor suction pressure suddenly increasing

單項選擇題

Which of the listed characteristics can be applied to R- 12 vapor?（）

A.It is corrosive
B.It is odorless
C.It is visible as h blue fog
D.It has a distinctive taste