單項(xiàng)選擇題To avoid impingement attack, care must be taken with the water () through the tubes of the heat exchangers.

A.temperature
B.velocity
C.density
D.viscosity


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1.單項(xiàng)選擇題A non-return valve in the air delivery line near to the compressor must be ()type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity

2.單項(xiàng)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

4.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

5.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

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