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Fluid Mechanics

Fluid Mechanics
Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.

30
10
1
50

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Fluid Mechanics
Two dimensional stream function

Is constant along a stream line
None of these
Is constant along an equipotential surface
Relates velocity and pressure

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Fluid Mechanics
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

F = f₁ + f₂ + f₃
Q = Q₁ + Q₂ + Q₃
Q₁ = Q₂ = Q₃
V₁ = V₂ = V₃

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Fluid Mechanics
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)

1.5 Vavg
Vavg
1.8 Vavg
1.2 Vavg

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

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

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Fluid Mechanics
In magnetic flow meters, voltage generation is

Both A and B
Due to the motion of conducting fluid through an externally generated uniform field
Neither A nor B
Proportional to the fluid velocity

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