题目内容

Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.

A. refrigerant bubbles in the lube oil
B. refrigerant reducing the lube oil viscosity
C. oxidation(氧化) of the lube oil from overheating
D. reducing the floc or cloud point of the oil

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In a chilled(冷的) water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ______.

A. increasing refrigerant pressure in the coil
B. increasing chilled water flow through the cooler
C. sub-cooling the refrigerant in the condenser
D. superheating the refrigerant in the compressor

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The effective temperature of air is dependent upon ______. I. relative humidity II.

A. I only
B. II only
C. Both I and II
D. Neither I nor II

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In a ______boiler the hot gases from the furnace pass through the tubes while the water is

A. water-tube
B. fire-tube
C. exhaust gas
D. Composite

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______continuously extract the crankcase atmosphere, via a pipe system, and move it past a

A. The oil mist detectors
B. The smoke detectors
C. An oily water monitor
D. Oil discharge monitoring and controlling system

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Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.

A. refrigerant bubbles in the lube oil B. refrigerant reducing the lube oil viscosity C. oxidation(氧化) of the lube oil from overheating D. reducing the floc or cloud point of the oil

In a chilled(冷的) water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by ______.

The effective temperature of air is dependent upon ______. I. relative humidity II.

In a ______boiler the hot gases from the furnace pass through the tubes while the water is

______continuously extract the crankcase atmosphere, via a pipe system, and move it past a

A. refrigerant bubbles in the lube oil
B. refrigerant reducing the lube oil viscosity
C. oxidation(氧化) of the lube oil from overheating
D. reducing the floc or cloud point of the oil