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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
ML/G
L/mG
LG/m

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Mass Transfer
Dimension of mass diffusivity is the same as that of

Surface tension
Kinematic viscosity
Dynamic viscosity
Pressure

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Decreases with time
Increases with time
Does not change with time
Does not affect the moisture content of the wet solid

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Mass Transfer
COâ‚‚ can be absorbed by

Alumina
Heated charcoal
Cold Ca(OH)â‚‚
Hot cupric oxide

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = (1 - Re)/Re
Ri = Re
Ri = Re/(1 + Re)

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.

Film
Penetration
Surface-renewal
None of these

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