# Mechanical Engineering - Hydraulic Machines

### Exercise :: Hydraulic Machines - Section 1

31.

The maximum number of jets, generally, employed in an impulse turbine without jet interference are

 A. two B. four C. six D. eight

Explanation:

No answer description available for this question. Let us discuss.

32.

In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.

 A. True B. False

Explanation:

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33.

Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

 A. Q = π.D.Vf B. Q = π.b.Vf C. Q = π.D.b.Vf D. Q = D.b.Vf

Explanation:

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34.

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

Explanation:

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35.

When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

 A. Agree B. Disagree