Hydraulics and Fluid Mechanics in ME
The function of guide vanes in a reaction turbine is to

Allow the water to enter the runner without shock
Allow the required quantity of water to enter the turbine
All of the listed here
Allow the water to flow over them, without forming eddies

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is the

Ratio of the work done on the wheel to the energy of the jet
Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
None of these
Ratio of the actual work available at the turbine to the energy imparted to the wheel

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