A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above
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Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ()
(1) reciprocating
(2) vane
(3) gear
A.(1)only
B.(1)and(2)
C.(1),(2)and(3)
D.(2)and(3)
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ()
(1) reciprocating
(2) rotary
(3) centrifugal
A.(1)only
B.(1)and(2)
C.(1),(2)and(3)
D.(2)and(3)
A.increased;decreased
B.decreased;increased
C.decreased;decreased
D.increased;increased
A.kg
B.MPa
C.mH20
D.None of the above
Which of the following are components of a mechanical seal? ()
(1) stationary ring
(2) rotational ring
(3) packing
(4)spring
A.(1), (2) and (3)
B.(1), (2) and (4)
C.(2), (3) and (4)
D.None of the above
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