Mass Transfer

381.Radioactive nuclear waste is treated in

1. Mixer-settler extractor
2. Rotating-disc contactor
3. Pulsed column extractor
4. Bollman extractor

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382.Raoult's law applies to the

1. All liquid solutions
2. Non-ideal solution only
3. Non-volatile solute
4. Solvents

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383.Raoult's law is applicable to the

1. Ideal solutions
2. Real solutions
3. Mixture of water and alcohol
4. Non-ideal gases

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384.Raschig ring made of porcelain cannot be used for treating concentrated

1. Hydrochloric acid
2. Nitric acid
3. Alkalis
4. Sulphuric acid

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385.Rate of leaching increases with increasing

1. Temperature
2. Viscosity of solvent
3. Pressure
4. Size of the solid

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386.Rayleigh equation applies to _________ distillation.

1. Differential
2. Flash
3. Equilibrium
4. Molecular

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387.Rayleigh's equation applies to _________ distillation.

1. Continuous
2. Steam
3. Differential
4. Flash

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388.Reboiler is considered as one theoretical plate, because

1. Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
2. Vapour is recycled to the column
3. Reboiler itself contains one plate
4. None of these

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389.Refractory bricks are usually dried in a _________ dryer.

1. Tray
2. Tunnel
3. Conveyor
4. Festoon

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390.Relative humidity is the ratio of the

1. Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
2. Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
3. Actual humidity to saturation humidity
4. None of these

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