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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The discharge in an open channel corresponding to critical depth is

Minimum
None of these
Maximum
Zero

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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
flv²/2gd
flv²/gd

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Hydraulics and Fluid Mechanics in ME
Any change in load is adjusted by adjusting following parameter on turbine

Blade velocity
Absolute velocity
Flow
Net head

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Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure above the nappe is atmospheric
The pressure below the nappe is atmospheric
The pressure below the nappe is negative
The pressure above the nappe is negative

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Hydraulics and Fluid Mechanics in ME
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

wAx
wA
wx
wA/x

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Hydraulics and Fluid Mechanics in ME
The magnitude of water hammer depends upon the

Elastic properties of the liquid flowing through the pipe
Elastic properties of the pipe material
Speed at which the valve is closed
All of these

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