單項(xiàng)選擇題

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

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單項(xiàng)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

單項(xiàng)選擇題

The percentage of impurities in a specific fuel oil sample is determined by （）.

A.settling in a fuel tank
B.testing in a laboratory centrifuge
C.burning in a calorimeter
D.testing in a closed cup

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

你可能感興趣的試題

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

The percentage of impurities in a specific fuel oil sample is determined by （）.