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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - 0.1nH)H5/2
1.84(L - 0.1nH)H3/2
1.84(L - nH)H2
1.84(L - nH)H3

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Hydraulics and Fluid Mechanics in ME
A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

Velocity head
Manometric head
Kinetic head
Static head

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

More than
Less than
None of these
Equal to

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Hydraulics and Fluid Mechanics in ME
Center of pressure compared to e.g. is

At same point
Above or below depending on area of body
Below it
Above it

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Hydraulics and Fluid Mechanics in ME
Liquids

Are not affected by change in pressure and temperature
Cannot be compressed
None of the listed here
Occupy definite volume

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Hydraulics and Fluid Mechanics in ME
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

(8/15) Cd. 2g. H²
(8/15) Cd. 2g. H3/2
(8/15) Cd. 2g. H
(8/15) Cd. 2g. H5/2

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