单项选择题When start a screw pump, the by pass valve should be ().

A.closed
B.opened fully
C.cracked open
D.partly open


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1.单项选择题A centrifugal pump can’t supply water after startingYou should check ().

A.priming water
B.power supply
C.packing gland
D.bearing lubrication

2.单项选择题Open the ()of inter cooler before starting an air compressor.

A.cylinder cover
B.cooling water
C.oil cup
D.drain valve

3.单项选择题Open the ()before starting an air compressor.

A.unload valve
B.cooling water
C.oil cup
D.sump

4.单项选择题Supply the ()before starting an air compressor.

A.fuel oil
B.cooling water
C.steam
D.power

5.单项选择题During working of an air compressor, () should be drained.

A.oil sump
B.oil separator
C.outlet pipe
D.inlet pipe

6.单项选择题During working of an air compressor, () should be drained.

A.inter cooler
B.cylinder
C.outlet pipe
D.inlet pipe

7.单项选择题Before starting an air compressor, It should be ().

A.unloaded
B.primed
C.filled with water
D.greased

8.单项选择题Before starting an air compressor, It should be ().

A.turned
B.oil level checked
C.filled with water
D.A and B

9.单项选择题The air compressor pumps air to the().

A.engine cylinder
B.air bottle
C.evaporator
D.condenser

10.单项选择题The air compressor pumps air to the ().

A.expansion tank
B.combustion chamber
C.air receiver
D.evaporator