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Fluid Mechanics

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)

2x
x
x/2
πx

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Fluid Mechanics
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

P and R
R and S
P, Rand S
P, Q and R

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

2
> 1
1
< 1

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Fluid Mechanics
Pressure gradient in the pipe flow is influenced by the

Diameter of pipe
Density & viscosity of the fluid
Velocity of the fluid
All 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
D
1/d

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Fluid Mechanics
A piezometer opening measures the __________ fluid pressure.

Static
Undisturbed
Total
Dynamic

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