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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ D2
K ∝ D1.5
K ∝ D
K ∝ √D

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P
P >>P
P < P
P = P

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Partial pressure of water vapor
Wet bulb temperature
None of these
Relative humidity

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Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Minimum trays and maximum reboiler heat load
Infinite trays and maximum reboiler heat load
Minimum trays and minimum reboiler heat load
Infinite trays and minimum reboiler heat load

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Mass Transfer
Which of the following remains constant during evaporative cooling process with recirculated water supply?

None of these
Relative humidity
Wet bulb temperature
Partial pressure of vapour

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Mass Transfer
__________ is concerned with the adsorption equilibria.

None of these
Freundlich equation
Gibb's equation
Fick's law

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