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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For manometer, a better liquid combination is one having

high density and viscosity
higher surface tension
surface tension is no criterion
lower surface tension

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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.

Equal to
None of these
Less than
More than

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Hydraulics and Fluid Mechanics in ME
The optimum value of vane exit angle for a centrifugal pump impeller is

10-15°
50-60°
20-25°
30-40°

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

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Hydraulics and Fluid Mechanics in ME
The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is

(waV/g) × sin θ
(waV²/g) × sin θ
(waV²/2g) × sin 2θ
(waV/2g) × sin θ

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Hydraulics and Fluid Mechanics in ME
Francis turbine is best suited for

Low head installation up to 30 m
High head installation above 180 m
All types of heads
Medium head application from 24 to 180 m

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