Hydraulics and Fluid Mechanics in ME
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

Bernoulli’s equation
Continuity equation
Pascal’s law
Archimedes’s principle

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

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

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