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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.50 to 0.65
0.85 to 0.90
0.65 to 0.75
0.75 to 0.85

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Hydraulics and Fluid Mechanics in ME
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called

Density of liquid
Specific gravity of liquid
Compressibility of liquid
Surface tension of liquid

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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

43924
2
1

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Hydraulics and Fluid Mechanics in ME
During the opening of a valve in a pipe line, the flow is

Steady
Uniform
Laminar
Unsteady

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Hydraulics and Fluid Mechanics in ME
If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is

1
4
2
43924

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Hydraulics and Fluid Mechanics in ME
The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)

(H + hf )/H
H/(H - hf )
(H - hf )/H
H/(H + hf )

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