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

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

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is the

Ratio of the actual work available at the turbine to the energy imparted to the wheel
Ratio of the work done on the wheel to the energy of the jet
None of these
Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

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