单项选择题

Which of the following pumps will most affect oily water separator performance and give the worst result?（）

A.reciprocating pump
B.vane pump
C.screw pump
D.centrifugal pump

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单项选择题

Which of the following pumps is most suitable for an oily water separator?（）

A.reciprocating pump
B.vane pump
C.mono pump
D.axial-flow pump

单项选择题

With reference to a two ram actuating mechanism, which one of the following statement is false?（）

A.The rams work inside cylinders
B.The cylinders have glands sealing their open ends
C.The rams are connected to a cross-head
D.The cross-head is mounted on the rudder stock

单项选择题

The DC excitation to the field of brushless synchronous is generally produced by （）

A.an exciter driven by the same shaft with the generator
B.an exciter driven by external prime mover
C.generator itself
D.either A and B