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Mass Transfer

Mass Transfer
The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)

G/mL
L/mG
ML/G
LG/m

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Mass Transfer
For gas absorption, low viscosity solvents are preferred, because of their

Rapid absorption rates
Low pumping pressure drop
All of these
Better flow characteristics

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Mass Transfer
Back-trapping in a distillation column

Decreases tray efficiency
Is desirable, as it provides improved vapour-liquid contact
Reduces pressure drop
Increases tray efficiency

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Mass Transfer
Reboiler is considered as one theoretical plate, because

Vapour is recycled to the column
None of these
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Reboiler itself contains one plate

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Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Calculated
Not required
Known
Unknown

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Film
None of these
Penetration
Surface renewal

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