Hydraulics and Fluid Mechanics in ME
A body floats in stable equilibrium

Metacentre has nothing to do with position of e.g. for determining stability
When its meatcentric height is zero
When the metacentre is above e.g.
When its e.g. is below its center of buoyancy

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

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