Q. Very tall packed towers are divided into series of beds to

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Q. Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

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Q. With increase in temperature, the solubility of gases in liquids, at fixed pressure

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Q. In most of the vacuum crystalliser, vacuum is generally produced by means of a

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Q. In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of

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Q. Wetted wall tower experiment determines the

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Q. In McCabe-Thiele method, at infinite reflux ratio

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Q. With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

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Q. Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

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Q. The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is

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Q. Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

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Q. Pick out the system with minimum boiling azeotrope at 1 atm.

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Q. Free flowing granular materials can be best dried in a __________ drier.

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Q. In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

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Q. Molarity is defined as the number of gm moles of solute per __________ of solvent.

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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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