Hydraulics and Fluid Mechanics in ME
The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

[wa (V - v)]/2g
[wa (V - v)]/g
[wa (V - v²)]/g
[wa (V - v)²]/2g

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Hydraulics and Fluid Mechanics in ME
Surface tension

Is a function of the curvature of the interface
Is also known as capillarity
Decreases with fall in temperature
Acts in the plane of the interface normal to any line in the surface

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Hydraulics and Fluid Mechanics in ME
Mechanical efficiency of a centrifugal pump is the ratio of

Energy available at the impeller to the energy supplied to the pump by the prime mover
Energy supplied to the pump to the energy available at the impeller
Manometric head to the energy supplied by the impeller per kN of water
Actual work-done by the pump to the energy supplied to the pump by the prime mover

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