Hydraulics and Fluid Mechanics in ME
Overall 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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Hydraulics and Fluid Mechanics in ME
When a liquid is flowing through a pipe, the velocity of the liquid is

Zero at the centre and maximum near the walls
Minimum at the centre and maximum near the walls
Maximum at the centre and zero near the walls
Maximum at the centre and minimum near the walls

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