Fluid Mechanics
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

Vs/Dp²
Vs²/Dp²
Vs²/Dp³
Vs/Dp³

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Fluid Mechanics
Vane anemometer

Is a variable head meter
Is an area meter
None of these
Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed

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