Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

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

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Hydraulics and Fluid Mechanics in ME
In a forced vortex motion, the velocity of flow is

inversely proportional to the square of its radial distance from the axis of rotation
directly proportional to its radial distance from axis of rotation
directly proportional to the square of its radial distance from the axis of rotation
inversely proportional to its radial distance from the axis of rotation

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