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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

Submerged weir
Broad-crested weir
Narrow-crested weir
Ogee weir

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Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

It has minimum wetted perimeter
All of these
It gives maximum discharge for a given cross-sectional area and bed slope
It involves lesser excavation for the designed amount of discharge

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Hydraulics and Fluid Mechanics in ME
A hydraulic coupling belongs to the category of

Energy transfer machines
Power developing machines
Energy generating machines
Power absorbing machines

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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 , the horse power required will be

Same
1.5 B.H.P
H.P./0.75
0.75 B.H.P

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Hydraulics and Fluid Mechanics in ME
Gradually varied flow is

steady uniform
steady non-uniform
non-steady non-uniform
non-steady uniform

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Hydraulics and Fluid Mechanics in ME
The variation in the volume of a liquid with the variation of pressure is called its

Surface tension
Viscosity
Compressibility
Capillarity

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