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
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

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Hydraulics and Fluid Mechanics in ME
The total energy of a liquid particle in motion is equal to

Pressure energy - (kinetic energy + potential energy)
Pressure energy + kinetic energy + potential energy
Kinetic energy - (pressure energy + potential energy)
Potential energy - (pressure energy + kinetic energy

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