Fluid Mechanics
In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is

Not constant along a streamline
Constant along a streamline
Increased in the direction of flow
None of these

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Fluid Mechanics
The Prandtl mixing length is

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

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Fluid Mechanics
A differential pressure cell is used for

Remote recording of pressure difference
Measuring small pressure difference in liquids
Measuring small pressure difference in gases
Measuring the difference of the impact & the static pressure

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