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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Double
Four times
Sixteen times
Eight times

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Hydraulics and Fluid Mechanics in ME
The flow ratio in case of Francis turbine varies from

0.4 to 0.5
0.6 to 0.9
1 to 1.5
0.15 to 0.3

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Hydraulics and Fluid Mechanics in ME
Barometer is used to measure

Very low pressure
Atmospheric pressure
Difference of pressure between two points
Pressure in pipes, channels etc.

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Hydraulics and Fluid Mechanics in ME
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

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

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Hydraulics and Fluid Mechanics in ME
The bulk modulus of elasticity with increase in pressure

increases first upto certain limit and then decreases
remains constant
decreases
increases

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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
(waV/2g) × sin θ
(waV²/2g) × sin 2θ

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