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Mass Transfer

Mass Transfer
Desirable value of absorption factor in an absorber is

0.5
> 1
1
< 1

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D2
K ∝ D1.5
K ∝ √D
K ∝ D

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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

4.605
9.21
0.001
100

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Mass Transfer
In most of the vacuum crystalliser, vacuum is generally produced by means of a

Compressed air jet
Steam jet ejector with a barometric condenser
Suction pump
None of these

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Mass Transfer
The cooling effect in a cooling tower can be speeded up by

Increasing the air velocity and area of exposed wet surface
Reducing the humidity of the air
Reducing the barometric pressure
All of the listed here

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Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Infinite trays and minimum reboiler heat load
Minimum trays and maximum reboiler heat load
Infinite trays and maximum reboiler heat load
Minimum trays and minimum reboiler heat load

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