Q. H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

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Q. Packed column distillation is limited to the column __________ metres.

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Q. For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

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Q. The operating cost of a distillation column at minimum reflux ratio is

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Q. The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is

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Q. Molecular diffusivity of a liquid

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Q. The wet and dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

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Q. Henry's law states that the

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Q. The relative volatility of a binary mixture at constant temperature __________ the total pressure.

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Q. Tower diameter may be decreased by

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Q. Rayleigh's equation applies to __________ distillation.

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Q. Steady state equimolal counter diffusion is encountered in

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Q. Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method ?

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Q. Removal of __________ exemplifies an adsorption unit operation.

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Q. Can the efficiency of a plate in the distillation tower be greater than 100% ?

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Q. With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

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Q. For gas absorption, low viscosity solvents are preferred, because of their

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Q. To remove all the moisture from a wet solid it requires exposure to __________ air.

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Q. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?

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Q. As the reflux ratio increases, the slope of the operating line for rectifying section

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