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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

0.83
0.4
0.3
0.6

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Hydraulics and Fluid Mechanics in ME
A streamline is defined as the line

of equal yelocity in a flow
along which the pressure drop is uniform
parallel to central axis flow
parallel to outer surface of pipe

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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
wx
wA/x
wA

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Hydraulics and Fluid Mechanics in ME
The ratio of absolute viscosity to mass density is known as

coefficient of viscosity
viscosity index
kinematic viscosity
specific viscosity

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Hydraulics and Fluid Mechanics in ME
The unit of kinematic viscosity in S. I. units is

m2/s
N-m/s
N-m
N-s/m2

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(2/3) Cd × b × √(2g) × H2
(2/3) Cd × b × √(2gH)
(2/3) Cd × b × √(2g) × H3/2
(2/3) Cd × b × √(2g) × H

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