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Mass Transfer

Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Long tube
Falling film
Short tube
Vacuum

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Mass Transfer
Decoction refers to the use of solvent

At its boiling point
At ambient temperature
In its vapor form
None of these

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De/t)1/2
(De.t)1/2
(4De/πt)1/2
(4De/t)

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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

0.001
4.605
9.21
100

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Flow rate of inlet air
Relative humidity of outlet air
Humidity of inlet air
Temperature of the solid

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Mass Transfer
The humid volume may be increased by increasing the

Both A & B
Temperature at constant humidity
Humidity at constant temperature
Neither A nor B

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