Fluid Mechanics
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

Pitot tube
Orificemeter
Venturimeter
Rotameter

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Fluid Mechanics
Vane anemometer

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

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