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

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

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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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