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

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

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

Manometric head to the energy supplied by the impeller per kN of water
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
Actual work-done by the pump to the energy supplied to the pump by the prime mover

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Hydraulics and Fluid Mechanics in ME
Coefficient of contraction is the ratio of

Area of jet at vena-contracta to the area of orifice
Loss of head in the orifice to the head of water available at the exit of the orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Loss of head in the orifice to the head of water available at the exit of the orifice

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