Fluid Mechanics
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

V/Vmax = (x/r)1/7
V/Vmax = (x.r)1/7
None of these
V/Vmax = (r/x)1/7

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Fluid Mechanics
A differential pressure cell is used for

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

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