Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant pressure, the speed capacity and power vary

As square of density
Directly as the air or gas density
Inversely as square root of density
Inversely as density

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Hydraulics and Fluid Mechanics in ME
Mechanical efficiency of a centrifugal pump is the ratio of

Energy available at the impeller to the energy supplied to the pump by the prime mover
Actual work-done by the pump to the energy supplied to the pump by the prime mover
Energy supplied to the pump to the energy available at the impeller
Manometric head to the energy supplied by the impeller per kN of water

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Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

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

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