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

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Hydraulics and Fluid Mechanics in ME
The total energy of a liquid particle in motion is equal to

Pressure energy + kinetic energy + potential energy
Potential energy - (pressure energy + kinetic energy
Kinetic energy - (pressure energy + potential energy)
Pressure energy - (kinetic energy + potential energy)

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