Q. The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

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Q. An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored:

(i) a reboiler is used and
(ii) no reboiler is used but steam is fed directly to the bottom of the column.

As compared to option (i), in option (ii)

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Q. The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law.

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Q. Which of the following binary systems is an example of a maximum boiling azeotrope ?

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Q. (NRe . NSc) is termed in mass transfer operation as the __________ number.

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Q. The binary diffusivity in gases and liquids vary respectively as

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Q. Pick out the correct statement.

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Q. Pick out the correct statement.

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Q. The McCabe Δ L law states that the

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Q. Bollman extractor

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Q. The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.

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Q. A coalescer in a mixer-settler liquid-liquid extraction coloumn

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Q. For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

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Q. Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

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Q. If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is

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Q. Liquid diffusivity is of the order of __________ cm² /second.

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Q. The solvent used in liquid extraction should not have high latent heat of vaporisation, because

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Q. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

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Q. Pick out the correct statement.

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Q. 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

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