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

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Hydraulics and Fluid Mechanics in ME
The flow in a pipe or channel is said to be uniform when

Each liquid particle has a definite path
The liquid particles at different sections have different velocities
The quantity of liquid flowing per second is constant
The liquid particles at all sections have the same velocities

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Hydraulics and Fluid Mechanics in ME
Mach number is significant in

supersonics, as with projectiles and jet propulsion
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
all of fhe above
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls

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