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Mass Transfer

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

Dehydration
Adsorption
Sublimation
Evaporation

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Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Varies directly as the pressure
Varies inversely as the pressure
Is independent of pressure
Is equal to the volumetric diffusivity

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Mass Transfer
__________ developed the film theory.

Ergun
Higbie
Levenspeil
Fick

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Mass Transfer
Which of the following operations does not involve leaching?

Dissolving pharmaceutical products from bark or roots
Dissolving gold from ores
Dissolving sugar from the cells of the beet
Removing nicotine from its water solution by kerosene

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Mass Transfer
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

q = 1
q = 0
q < 1
q > 1

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Mass Transfer
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

Equal to the heat of formation of surface compound
Zero
Called integral heat of adsorption
Equal to the heat of wetting

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