單項(xiàng)選擇題

To obtain maximum efficiency, two stage air compressors are usually （）.

A.horizontally mounted
B.never fitted with intake filters
C.fitted with intercoolers
D.operated in an unloaded condition at all times

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單項(xiàng)選擇題

Which of the following statements is true concerning the overall efficiency of air compressors?（）

A.High pressure compressors are more efficient than low pressure compressors
B.Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit
C.Two stage compressors are generally more efficient than single stage compressors
D.The volumetric efficiency is decreased in multistage compressors

單項(xiàng)選擇題

The ability of an oil to separate cleanly from an oil and water mixture is referred to as its （）.

A.precipitation number
B.neutralization number
C.pour point
D.demulsibility