Hydraulics and Fluid Mechanics in ME
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

Running full
Running free
Partially running full
Partially running free

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Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
pressure is increased
flow is increased
pressure becomes more than critical pressure

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