Hydraulics and Fluid Mechanics in ME
Hydraulic accumulator is used for

Supplying large quantities of oil for very short duration
Accumulating oil
Generally high pressures to operate hydraulic machines
Supplying energy when main supply fails

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Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Actual discharge through an orifice to the theoretical discharge
Actual velocity of jet at vena contracta to the theoretical velocity
None of these
Area of jet at vena contracta to the area of orifice

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