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Mass Transfer

Mass Transfer
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is

Less
Unpredictable
Same
More

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Mass Transfer
__________ column is used in gas absorption process.

Seive/perforated tray
Bubble cap
Packed
Wetted wall

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Decreases
And the heat required in reboiler decreases
Increases
Remains unaffected

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ √D
K ∝ D1.5
K ∝ D2
K ∝ D

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Mass Transfer
Critical humidity of a solid salt means the humidity

Both A and B
Below which it will always stay dry
Above which it will always become damp
Above Which it will always become dry and below which it will always stay damp

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Mass Transfer
Very tall packed towers are divided into series of beds to

Avoid flooding
Reduce liquid hold-up
Avoid channelling
Reduce the overall pressure drop

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