單項(xiàng)選擇題The static suction lift of a pump is the difference in elevation between the （）.

A.centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
B.centerline of the pump and the suction liquid level when the source of liquid is above the pump
C.centerline of the pump and the level of the discharge liquid
D.liquid levels of the suction and discharge


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1.單項(xiàng)選擇題The sum of the sensible heat and the latent heat of any substance is known as （）.

A.total heat
B.residual heat
C.specific heat
D.superheat

2.單項(xiàng)選擇題With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）

A.Single stage or multistage
B.High pressure or low pressure
C.Open or close coupled
D.Horizontal or vertical

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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