Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

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

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Hydraulics and Fluid Mechanics in ME
The function of guide vanes in a reaction turbine is to

All of the listed here
Allow the water to flow over them, without forming eddies
Allow the water to enter the runner without shock
Allow the required quantity of water to enter the turbine

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