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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

Half the breadth
Twice the breadth
Half the depth
Twice the depth

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Hydraulics and Fluid Mechanics in ME
Gradually varied flow is

non-steady uniform
steady non-uniform
steady uniform
non-steady non-uniform

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Hydraulics and Fluid Mechanics in ME
Dynamic viscosity of most of the gases with rise in temperature

unpredictable
remains unaffected
increases
decreases

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Hydraulics and Fluid Mechanics in ME
The time oscillation of a floating body with increase in meatcentric height will be

Same
Higher
Lower
Lower/higher depending on weight of body

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Hydraulics and Fluid Mechanics in ME
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is

0.417 H5/2
1.417 H5/2
7.141 H5/2
4.171 H5/2

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Hydraulics and Fluid Mechanics in ME
The Newton's law of resistance is based on the assumption that the

Planes of the body are completely smooth
Fluid particles do not exert any influence on one another
Space around the body is completely filled with the fluid
All of these

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