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Fluid Mechanics

Fluid Mechanics
The speed of sound in an ideal gas varies as the

Pressure
Temperature
None of these
Density

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Fluid Mechanics
The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)

πx
2x
x
x/2

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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.)

d2/3
d1/3
√d
d4/5

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

Increase
Decrease
Remain same
Unpredictable

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Fluid Mechanics
Volume of liquid displaced by a floating body is equivalent to its

Submerged volume
Submerged weight
Own volume
Own weight

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Fluid Mechanics
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1

None of these
Decreases as V²
Decreases linearly with V
Increases linearly with V

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