Mass Transfer
__________ temperature is the steady state temperature attained by a small amount of liquid evaporating into a large quantity of unsaturated gas-vapor mixture.

Dew point
None of these
Wet bulb
Dry bulb

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Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

2000
1000
1500
2500

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

Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Liquids decompose, if distilled directly at atmospheric pressure
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
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to that of component B
Vapour pressure of component A to the total pressure
Partial pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A

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