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Mass Transfer

Mass Transfer
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?

< 1
∞
1

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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
Relative humidity
None of these

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Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Kissinevskii
Higbie
Danckwerts
Toor and Marchello

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Mass Transfer
If the amount of the steam used in steam distillation is increased, the temperature of distillation

Remains unchanged
Increases
Decreases
Depends on relative volatility

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Zero
Infinite
Minimum
Maximum

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Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

- (f - 1)/f
- 1/f
(1 - f)/f
- f/(1 - f)

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