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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm³/sec
Cm²/seC₂
Cm/sec
Cm²/sec

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

2.5 to 3
3 to 4
1.2 to 1.5
5

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Mass Transfer
Ordinary diffusion process is also called __________ diffusion.

Pressure
Thermal
Concentration
Forced

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Mass Transfer
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

Remains unaffected
Increases
Decreases
Increases Linearly

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Wetted wall tower
Perforated tray tower
Bubble cap tower
Grid tray tower

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Mass Transfer
Water entrained by circulating air in cooling towers is termed as

Vapor load
Blow down
Drift
None of the listed here

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