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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
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

1.2 to 1.5
3 to 4
5
2.5 to 3

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

> 8:1
< 8 : 1
> 4 :1
< 6:1

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Mass Transfer
Large scale drying of sugar is done in a __________ dryer.

Tray
Rotary
Spouted bed
Truck

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

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

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Mass Transfer
As the reflux ratio decreases, the

Separation becomes more efficient
Column diameter increases
None of these
Number of plates increases

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