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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A flow whose streamline is represented by a straight line, is called __________ dimensional flow.

Four
Three
One
Two

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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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Hydraulics and Fluid Mechanics in ME
A differential manometer is used to measure

Pressure in Venturimeter
Pressure in pipes and channels
Atmospheric pressure
Difference of pressures between two points in a pipe

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Hydraulics and Fluid Mechanics in ME
The equation of continuity holds good when the flow

All of these
is steady
is one dimensional
velocity is uniform at all the cross sec-tions

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Hydraulics and Fluid Mechanics in ME
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

0.75 Q
1.5 Q
Q/0.75
Same quantity of liquid

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

Increases
Unpredictable
Decreases
Remain unaffected

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