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


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1.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

2.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

4.單項選擇題During compressors running the accumulated moisture in the separators must be ().

A.drained off
B.collected
C.sent to the crankcases
D.separated with oil

5.單項選擇題By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by ().

A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors