Hydraulics and Fluid Mechanics in ME
A hydraulic press is a device used

To store pressure energy which may be supplied to a machine later on
To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
All of these
To lift larger load by the application of a comparatively much smaller force

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Hydraulics and Fluid Mechanics in ME
Manometric head, in case of a centrifugal pump, is equal to

Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
Energy per kN at outlet of impeller Energy per kN at inlet of impeller
Work-done per kN of water Losses within the impeller
All of these

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Hydraulics and Fluid Mechanics in ME
Overall 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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