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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

1/4 to 1/3
1/8 to 1/4
1/3 to 1/2
1/16 to 1/8

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Hydraulics and Fluid Mechanics in ME
A balloon lifting in air follows the following principle

All of these
principle of buoyancy
law of gravitation
Archimedes principle

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Hydraulics and Fluid Mechanics in ME
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

d = (D⁵/8fl)1/4
d = (D⁵/8fl)1/5
d = (D⁵/8fl)1/3
d = (D⁵/8fl)1/2

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Hydraulics and Fluid Mechanics in ME
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is

2
1
43924

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Hydraulics and Fluid Mechanics in ME
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

Lies above its centre of gravity
Coincides with its centre of gravity
Lies between the centre of buoyancy and centre of gravity
Lies below its centre of gravity

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

0.36
0.56
0.46
0.26

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