Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

V1² / (V1² - V2²)
(V­1 - V2) / V1
V1 / (V1 - V2)
(V­1² - V2²) / V1²

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Hydraulics and Fluid Mechanics in ME
The meatcentric height is the distance between the

Original centre of buoyancy and new centre of buoyancy
Centre of gravity of the floating body and the centre of buoyancy
Metacentre and centre of buoyancy
Centre of gravity of the floating body and the metacentre

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