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Mass Transfer

Mass Transfer
Sticky material can be dried in a __________ dryer.

Rotary
Fluidised bed
Tray
None of these

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Mass Transfer
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

Increase 'S' and decrease 'G'
Decrease both 'G' and 'S'
Increase 'G' and decrease 'S'
Increase both 'G' and 'S'

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Mass Transfer
Stacked packing compared to dumped packing

Both A & B
Provides poorer contact between the fluids
Gives higher pressure drop
Gives lower pressure drop

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Mass Transfer
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T1.5
T3
T
√T

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.24
1.04
1.94
0.54

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Mass Transfer
Dorr thickener is an equipment used for

Leaching
Sedimentation
Clarification
Classification

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MORE MCQ ON Mass Transfer

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