Hydraulics and Fluid Mechanics in ME
The jet ratio is defined as the ratio of the

Diameter of Pelton wheel to the diameter of jet
Diameter of jet to the diameter of Pelton wheel
Velocity of jet to the velocity of Pelton wheel
Velocity of Pelton wheel to the velocity of jet

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Hydraulics and Fluid Mechanics in ME
When a body is placed over a liquid, it will sink down if

Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid
Gravitational force is equal to the up-thrust of the liquid
None of these

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Hydraulics and Fluid Mechanics in ME
Froude number is significant in

Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
All of the listed here
Supersonics, as with projectile and jet propulsion
Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls

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