Hydraulics and Fluid Mechanics in ME
The flow ratio of Francis turbine is defined as the ratio of the

Theoretical velocity of jet to the velocity of flow at inlet
Velocity of runner at inlet to the velocity of flow at inlet
None of these
Velocity of flow at inlet to the theoretical jet velocity

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Hydraulics and Fluid Mechanics in ME
Froude number is significant in

Supersonics, as with projectile and jet propulsion
All of the listed here
Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
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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