Hydraulics and Fluid Mechanics in ME
Froude number is significant in

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

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Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

None of these
Actual discharge through an orifice to the theoretical discharge
Area of jet at vena contracta to the area of orifice
Actual velocity of jet at vena contracta to the theoretical velocity

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