Hydraulics and Fluid Mechanics in ME
The runaway speed of a hydraulic turbine is the speed

At full load
At which the turbine will run freely without load
At which there will be no damage to the runner
Corresponding to maximum overload permissible

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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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