Mass Transfer
In case of unsaturated air

Dew point < wet bulb temperature
Both of the options given here
None of the listed here
Wet bulb temperature < dry bulb temperature

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Saturated steam is used for steam distillation
Temperature is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Total pressure is less

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Mass Transfer
Steam distillation is not recommended to be used, if the

Liquids decompose, if distilled directly at atmospheric pressure
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Azeotropic mixture is to be separated and the final product is miscible with water
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

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Mass Transfer
An example of elutioh is

Recovery of vegetable oils from seeds
Dissolution of tannin out of tree barks by water
Separation of sugar from sugar beet by hot water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank

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Mass Transfer
Channelling is most severe

In dumped packing of regular units
In towers packed with stacked packing
At very high liquid flow rate
In towers packed randomly with crushed solids

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