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Mass Transfer

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

Evaporation
Dehydration
Adsorption
Sublimation

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Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

Unity
None of these
Infinity
Zero

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-1.5
0.6
-0.6
1.5

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Lies above the equilibrium line
And equilibrium lines are parallel
Lies below the equilibrium line
Is far from the equilibrium line

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-4 cm²/seC₂
10-9 cm/sec
10-1 cm²/sec
10-3 sec/cm

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Mass Transfer
Which of the following mixtures does not form an azeotrope at atmosheric pressure?

Water-alcohol
Methyl alcohol-acetone
None of these
Butyl acetate-water

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