单项选择题
A.total heat B.residual heat C.specific heat D.superheat
With respect to centrifugal pump impellers, which of th...
单项选择题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
If a radial piston hydraulic pump fails to deliver rate...
单项选择题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
To maintain design discharge pressure from a centrifuga...
单项选择题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
