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Fluid Mechanics

Fluid Mechanics
Momentum transfer in laminar flow of fluids results due to the

Density
Velocity gradient
None of these
Viscosity

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

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Fluid Mechanics
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

Δp/2
2Δp
Δp²
Δp

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Fluid Mechanics
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.)

d4/5
d1/3
√d
d2/3

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Fluid Mechanics
Which of the following is not a dimension-less parameter?

Euler number
Fanning friction factor
Specific gravity
None of these

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Fluid Mechanics
The hydrodynamic and thermal boundary layers will merge, when

Schmidt number tends to infinity
Archimedes number is greater than 10000
Prandtl number is one
Nusselt number tends to infinity

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