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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.1
> 1
10-5 to 10-6
0.01

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Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

(X - 1)/X
X/(X + 1)
X/(X - 1)
(X + 1)/X

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Mass Transfer
When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

< 1
?
> 1
1

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Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm.

All of these
Benzene-toluene
Ethyl alcohol-water
Hydrochloric acid-water

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

Dehydration
Evaporation
Sublimation
Adsorption

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Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

Indirect tray
Spray
Freeze
None of these

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