Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

All of these
To control the pressure variations due to rapid changes in the pipe line flow
To eliminate water hammer possibilities
To regulate flow of water to turbines by providing necessary retarding head of water

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

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

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