Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

semi-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness
log-log plot of relative roughness against Reynolds number
log-log plot of friction factor against Reynolds number

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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
flow is increased
pressure is increased
pressure becomes more than critical pressure

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