Hydraulics and Fluid Mechanics in ME
A streamline is defined as the line

along which the pressure drop is uniform
parallel to central axis flow
parallel to outer surface of pipe
of equal yelocity in a flow

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

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

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