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Mass Transfer

Mass Transfer
Selectivity of the solvent used in solvent extraction should be

< 1
> 1
1

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Mass Transfer
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.

High pressure
Vacuum
Atmospheric
None of these

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

All of the listed here
Non-uniform & low production rate
High labour cost & low heat economy
High maintenance cost

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Mass Transfer
Humid volume, at a given temperature is a/an __________ function of humidity.

Exponential
Linear
Logarithmic
Inverse

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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 )

T3
T
T1.5
√T

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

Sublimation
Dehydration
Adsorption
Evaporation

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