Q. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

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Q. Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

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Q. Experimental determination of __________ is done by wetted wall column method.

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Q. Pore size of the molecular seive 5A is __________ mm.

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Q. Swenson-Walker crystalliser is a __________ unit

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Q. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αᴀʙ = 2) does not change appreciably in the coloumn.

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Q. Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in

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Q. With increase in temperature, the mutual solubility of two liquids

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Q. Pick out the wrong statement.

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Q. The relative volatility of a binary mixture at the azeotropic composition is

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

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Q. Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.

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Q. Lewis number (Le) is

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Q. Pick out the wrong statement:

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Q. In liquid extraction, if the selectivity is unity, then

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Q. Paper industry employs __________ driers.

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Q. Which of the following has the same dimension as mass diffusivity ?

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Q. Pick out the wrong statement pertaining to the cooling towers.

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Q. Perforated plate towers are unique for solvent extraction because, they provide

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Q. In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

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