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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Penetration
None of these
Surface renewal
Film

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Mass Transfer
Total reflux in a distillation operation requires minimum

Number of plates
Reboiler load
All of these
Condenser load

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Minimum
Infinite
Zero
Maximum

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

> 1
1
< 1

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Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

100
9.21
4.605
0.001

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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 )

T
T3
√T
T1.5

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