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
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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Hydraulics and Fluid Mechanics in ME
A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

Metal piece will sink to the bottom
The metal piece will be immersed in mercury by half
Whole of the metal piece will be immersed with its top surface just at mercury level
The metal piece will simply float over the mercury

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