单项选择题

If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.

A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling

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单项选择题

Which of the devices listed is common to all types of pumps?（）

A.A power end and fluid end
B.A propeller and educator
C.A volute and impeller
D.A turbine and piston

单项选择题

A centrifugal pump may fail to deliver water when first started if the （）.

A.water seal pipe is plugged
B.pump is not primed
C.seal ring is improperly located
D.impeller is flooded

单项选择题

Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）

A.Close radial clearance between impeller hub and casing
B.Low rotational speed of impeller
C.Removable end plate
D.Replaceable impeller and casing wearing rings