单项选择题

Which of the equipment listed is most effective in processing bilge slops for overboard discharge?（）

A.100PPM oily water separator
B.Assembling the lube oil purifier as a separator and aligning bilge overboard
C.A 15PPM oily water separator
D.A magnetic duplex strainer

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单项选择题

If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）

A.insufficient speed
B.cavitation
C.excess discharge pressure
D.excessive net positive suction head B

单项选择题

The valve which is most suited for regulating the flow through a pipeline is a （）

A.gate valve
B.globe valve
C.swing-check valve
D.plug-cock valve

单项选择题

Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）

A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller