單項選擇題

Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）

A.Lube oil passing through the system
B.Moisture or foreign matter collecting at the valve seat and orifice
C.Variable spring tension caused by the changing temperature
D.Frost on the liquid line

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單項選擇題

Broken valve strips in an operating low pressure, air compressor will cause （）.

A.an immediate crankcase explosion
B.oil contamination in the compressed air
C.a decrease in compressor capacity
D.no immediate loss of the compressed air capacity

單項選擇題

Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）

A.The density of the air entering the compressor
B.The temperature of the air entering the compressor
C.The designed rotating speed of the compressor
D.A leaking head gasket

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Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）

你可能感興趣的試題

Broken valve strips in an operating low pressure, air compressor will cause （）.

Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）