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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The total energy line lies over the centre line of the pipe by an amount equal to

Pressure head
Pressure head + velocity head
Pressure head - velocity head
Velocity head

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

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

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Hydraulics and Fluid Mechanics in ME
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

0.855 a. √2gH
0.707 a. √2gH
√2gH
0.5 a. √2gH

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Hydraulics and Fluid Mechanics in ME
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

Less than
More than
Equal to
None of these

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Hydraulics and Fluid Mechanics in ME
The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to

Archimedes’ principle
Buoyancy
Bernoulli’s theorem
Equilibrium of a floating body

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Hydraulics and Fluid Mechanics in ME
The hydraulic grade line is

All of these
always sloping downward in the direction of flow
never above the energy grade line
always above the centre line of pipe

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