Q. The surface renewal frequency in Danckwerts' model of mass transfer is given by (KL: mass transfer co-efficient)

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Q. A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below.
In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively.

The reflux ratio is

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Q. Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of two pairs partly soluble (e.g., chlorobenzene-water-methyl ethyl ketone system) ?

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Q. If moisture content of solid on dry basis is X, then the same on wet basis is

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Q. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively

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Q. Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively.

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Q. The following expression is

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Q. Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of one pair partly soluble (e.g. water-benzene-acetic acid in which A-diluent, B - solvent and C - solute)?

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Q. The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

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Q. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

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Q. Relative humidity is the ratio of the

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Q. In batch distillation with constant reflux, overhead product composition __________ with time.

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Q. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

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Q. Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

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Q. To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

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Q. In distillation columns, the number of bubble caps per tray primarily depends upon the

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Q. In distillation, overhead product contains

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Q. With increase in pressure, the relative volatility for a binary system

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Q. Low viscosity absorbent is preferred for reasons of

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Q. Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

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