Fluid Mechanics
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

√(HW/π)
HW/2(H + W)²
HW/4(H + W)²
2HW/(H + W)²

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Fluid Mechanics
Vane anemometer

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

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