Mass Transfer

391.Relative volatility does not change appreciably with the change in

1. Temperature
2. Vapour pressure of either component
3. Total pressure
4. None of these

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392.Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

1. Only vapor phase follows Raoult's law
2. Only liquid phase obeys Dalton's law
3. Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
4. Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law

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393.Removal of _________ exemplifies an adsorption unit operation.

1. Uranium from its ore
2. Water from petrol
3. Ammonia from coke oven gas
4. Mustard oil from mustard seed

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394.Reverse osmosis is also called

1. Dialysis
2. Electrodialysis
3. Diffusion
4. Ultra-filtration

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395.Rose oil is extracted from rose leaves using _________ distillation.

1. High pressure
2. Low pressure
3. Extractive
4. Steam

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396.Rotary dryers cannot handle _________ materials.

1. Free flowing
2. Dry
3. Sticky
4. Granular

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397.Sand is dried in foundries in a _________ drier.

1. Rotary
2. Fluidised bed
3. Vacuum
4. Spray

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398.Schmidt number and Lewis number for pure air at atmospheric conditions are respectively

1. < 1 and ≈ 1
2. 1 and 0
3. > 1 and ≈ 1
4. 0 and ≈ 1

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399.Schmidt number is given by

1. µ/ρD_AB
2. Re × Pe
3. Sh × Pe
4. Re/Pe

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400.Selectivity of the solvent used in solvent extraction should be

1. 1
2. > 1
3. < 1
4. 0

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