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

Answer: Option C

Explanation:

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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

Answer: Option A

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

Answer: Option C

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

A. kinetic head
B. velocity head
C. manometric head
D. static head

Answer: Option C

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

Answer: Option B

Explanation:

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