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Mass Transfer

Mass Transfer
Milk is dried usually in a __________ dryer.

Rotary
Spray
Tray
Freeze

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Avoid channeling
Reduce liquid hold up
Minimise the overall pressure drop
Avoid flooding

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Mass Transfer
What is the degree of freedom of an absorption process in which only one component is transferred between phases?

2
1
3
4

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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
T
T1.5
T3

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Heating only
Evaporative cooling
Both heating and humidification
Humidification only

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Mass Transfer
In case of constant underflow extraction operation, the __________ at all solute concentration.

Neither A nor B
Both A & B
Ratio of the insoluble to solution is constant
Solids are drained to the same extent

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