Fluid Mechanics
A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double

Head
None of these
Efficiency
Discharge

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Fluid Mechanics
The Prandtl mixing length is

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

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