Hydraulics and Fluid Mechanics in ME
In an inward flow reaction turbine

The water flows parallel to the axis of the wheel
The water enters at the center of the wheel and then flows towards the outer periphery of the wheel
The water enters the wheel at the outer periphery and then flows towards the center of the wheel
The flow of water is partly radial and partly axial

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

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 the energy imparted to the wheel
None of these

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