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

Orificemeter
Pitot tube
Venturimeter
Rotameter

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Fluid Mechanics
The Prandtl mixing length is

Independent of the shear stress
Independent of radial distance from the pipe axis
Zero at the pipe wall and is a universal constant
Useful for computing laminar flow problems

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