Hydraulics and Fluid Mechanics in ME
The magnitude of water hammer depends upon the

All of these
Speed at which the valve is closed
Elastic properties of the pipe material
Elastic properties of the liquid flowing through the pipe

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

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
Energy supplied to the pump to the energy available at the impeller
Energy available at the impeller to the energy supplied to the pump by the prime mover

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