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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A point, in a compressible flow where the velocity of fluid is zero, is called

Vena contracta
Critical point
None of the listed here
Stagnation point

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Hydraulics and Fluid Mechanics in ME
Air vessels in reciprocating pump are used to

Increase pump efficiency
Smoothen flow
Reduce acceleration to minimum
Save pump from cavitations

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Hydraulics and Fluid Mechanics in ME
Reynold's number is the ratio of the inertia force to the

Viscous force
Gravity force
Surface tension force
Elastic force

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Hydraulics and Fluid Mechanics in ME
The specific speed (Ns) of a centrifugal pump is given by

(N√Q)/H5/4
(N√Q)/H3/4
(N√Q)/H
(N√Q)/H2/3

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Hydraulics and Fluid Mechanics in ME
Which of the following statement is correct as regard to water wheels?

They have slow speeds
They give constant efficiency, even if the discharge is not constant
They are suitable even for low water heads
All of these

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Hydraulics and Fluid Mechanics in ME
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

3flv²/2gd
4flv²/2gd
flv²/gd
flv²/2gd

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