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

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

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

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

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