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Fluid Mechanics

Fluid Mechanics
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

< 1
> 1
1
2

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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
x
x/2
2x

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Fluid Mechanics
The dimension of kinematic viscosity is

None of these
L²T⁻¹
ML⁻²T⁻¹
ML⁻²T⁻²

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Fluid Mechanics
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).

0.44
0.24
24
24000

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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

Δp²
Δp
2Δp
Δp/2

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Fluid Mechanics
Boundary layer separation occurs when the

Cross-section of the channel is reduced
Valve is closed in a pipeline
Velocity of sound is reached
Pressure reaches a minimum

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