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Mass Transfer

Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Sublimation
Evaporation
Dehydration
Adsorption

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Mass Transfer
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

Natural
Forced
Induced
None of these

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Mass Transfer
Flooding results in

High gas velocity
Good contact between the fluids
Low tray efficiency
High tray efficiency

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Mass Transfer
Steam distillation is used for separation of high boiling

Substances from non-volatile impurities
Both of the options given here
Volatile impurity from still higher boiling substances
none of the listed here

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Mass Transfer
Diameter to height ratio for a rashig ring is

0.5
1
5
2

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Mass Transfer
Which of the following remains constant during sensible cooling process ?

None of the listed here
Partial pressure of vapour
Specific humidity
Specific humidity & Partial pressure of vapour

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