單項選擇題A water pump can not supply water after startingIt may be caused by ().

A.closed discharge valve
B.broken pipe line
C.worn shaft
D.both A and B


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題Dress up the ().

A.keyway
B.shaft
C.valve
D.casing

2.單項選擇題A mixed-flow pump is a () pump classified by the working principle.

A.self priming
B.positive displacement
C.reciprocating
D.impeller

4.單項選擇題The ()pump is usually used as the emergency bilge pump.

A.turbine
B.screw
C.vane
D.ejector

5.單項選擇題When starting a reciprocating pump, the inlet valve should be ().

A.closed
B.opened fully
C.cracked open
D.partly open