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Mass Transfer

Mass Transfer
Deairation (removal of O₂) of water is done by

Rectification
Absorption
Ion-exchange
Adsorption

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P
D ∝ P0.5
D ∝ 1/P1.5
D ∝ 1/P0.5

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

Humidified with wet bulb temperature decreasing
None of these
Humidified at constant wet bulb temperature
Dehumidified

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

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

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Mass Transfer
Extraction of coffee from its seed is done by

Steam distillation
Extractive distillation
Liquid-liquid extraction
Leaching

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Mass Transfer
The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.

Mass and momentum
Heat and mass
Heat and momentum
Heat, momentum and mass

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