Fluid Mechanics
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

U-tube mercury
Inclined tube water
U-tube water
Inclined tube mercury

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Fluid Mechanics
The Prandtl mixing length is

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

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