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

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

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Hydraulics and Fluid Mechanics in ME
When a liquid is flowing through a pipe, the velocity of the liquid is

Maximum at the centre and minimum near the walls
Maximum at the centre and zero near the walls
Minimum at the centre and maximum near the walls
Zero at the centre and maximum near the walls

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