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單項選擇題

If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.

A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage

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單項選擇題

To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.

A.shaft and impeller
B.motor and pump shaft
C.casing and impeller wearing rings
D.lantern ring and impeller

單項選擇題

In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.

A.central valve
B.radial plunger
C.floating ring
D.cylinder body

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