Fluid Mechanics
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

Positive displacement
Gear
Sump
Piston

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Fluid Mechanics
The Prandtl mixing length is

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

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