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FLUID MECHANICS

Fluid Mechanics
Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small.

Specific gravity
Electrical resistivity
Electrical conductivity
Thermal conductivity

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

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Fluid Mechanics
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

L/σ
Σ
1/d
D

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Fluid Mechanics
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.

4πg/3
0.01πgH/8
0.04πgH/3
0.01πgH/4

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Fluid Mechanics
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will

Increase
Remain same
Decrease
Unpredictable

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