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Mass Transfer

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

Evaporation
Sublimation
Adsorption
Dehydration

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Yes
Normally not; but is possible if infinite number of plates are put
Yes ; if the reflux ratio is maximum
Never

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1
1 and 0
>1 and ≈ 1
< 1 and ≈ 1

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P = P
P >>P
P < P
P

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Mass Transfer
In distillation, overhead product contains

Only one component
Only saturated liquid
Any number of components
Two components

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Mass Transfer
Which of the following decreases during evaporative cooling process with recirculated water supply?

None of these
Wet bulb temperature
Partial pressure of vapour
Relative humidity

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