单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
If your vessel bums 8 tons of fuel per hour at 15 knots, how many tons per hour will it burn at 18 knots?（）
A.1382 tons
B.1561 tons
C.1600 tons
D.1637 tons
