Q. When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

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Q. The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

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Q. In the constant rate period of the rate of drying curve for batch drying,

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Q. It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

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Q. The binary diffusivity in gases at atmospheric conditions is about

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Q. Percentage saturation is __________ the relative saturation.

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Q. In case of a desorber (stripper), the

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Q. What is the reflux ratio at total reflux ?

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Q. Under conditions of flooding in packed tower, the gas pressure drop

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Q. For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

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Q. For absorbing a sparingly soluble gas in a liquid

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Q. Channelling in a packed tower results from the

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Q. The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its

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Q. The minimum number of theoretical plates is required for achieving a given separation in distillation column with

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Q. At equilibrium the concentration of water in vapour phase (C*)in kg/m³ of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m³ containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

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Q. Dry bulb temperature of unsaturated air is more than its __________ temperature.

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Q. For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

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Q. The reciprocal of stripping factor is termed as

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Q. Ponchan-Savarit method analyses the fractional equipment based on

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Q. As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches

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