Q. Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.

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Q. If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

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Q. The dimension of diffusivity is same as that of the

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Q. Which of the following is directly concerned with psychrometry ?

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Q. Plate efficiency in a distillation column is reduced due to the __________ of liquid.

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Q. The most efficient cooling tower out of the following is

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Q. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.

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Q. Powdery materials can be guarded against caking tendency on storage by

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Q. According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

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Q. For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be

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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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