Hydraulics and Fluid Mechanics in ME
A floating body is said to be in a state of stable equilibrium

only when its centre of gravity is below its centre of buoyancy
when its metacentric height is zero
when the metacentre is below the centre of gravity
when the metacentre is above the centre of gravity

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

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

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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
None of these
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

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