Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of a reaction turbine, is the ratio of

None of these
Work-done on the wheel to the energy (or head of water) actually supplied to the turbine
Power produced by the turbine to the energy actually supplied by the turbine
Actual work available at the turbine to energy imparted to the wheel

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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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