單項(xiàng)選擇題Adequate attention must be given to the water cooling system of the air compressors, for （） can cause condensation on the cylinder walls.

A.overcooling
B.poor cooling
C.overloading
D.unloading


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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(xiàng)選擇題Some （） lying in the starting air lines will give rise to corrosion and can cause water hammer.

A.air
B.moisture
C.cooling water
D.lubricant

5.單項(xiàng)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