Hydraulics and Fluid Mechanics in ME
In case of an airfoil, the separation of flow occurs

at the extreme rear of body
midway between rear and front of body
at the extreme front of body
any where between rear and front of body depending upon Reynolds number

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

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

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