单项选择题

If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings

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单项选择题

Distilled water from an evaporator may be discharged into a potable water tank （）.

A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve

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

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