單項選擇題A () in the air delivery line near to each compressor is essential.

A.butterfly valve
B.globe valve
C.gate valve
D.non-return valve


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2.單項選擇題Bad valves operation of the reciprocating air compressors can be detected by observation of ().

A.the discharge temperature low
B.the discharge temperature high
C.the discharge pressure rise
D.the inter-stage pressure low

3.單項選擇題By far the greatest item of maintenance of the reciprocating air compressors concerns ().

A.the lubrication
B.the cooling
C.the moisture separation
D.the valves

4.單項選擇題A compressor should never be stopped ().

A.without first cooling it
B.without first heating it
C.without first unloading it
D.without first loading it