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

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

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Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

Width of channel at the top is equal to twice the width at the bottom
The sloping side is equal to the width at the bottom
The sloping side is equal to half the width at the top
Depth of channel is equal to the width at the bottom

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