Q. If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is

View solution

Q. Liquid diffusivity is of the order of __________ cm² /second.

View solution

Q. The solvent used in liquid extraction should not have high latent heat of vaporisation, because

View solution

Q. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

View solution

Q. Pick out the correct statement.

View solution

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

View solution

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

View solution

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

View solution

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%).

View solution

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

View solution

Q. Percentage saturation is __________ the relative saturation.

View solution

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

View solution

Q. What is the reflux ratio at total reflux ?

View solution

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

View solution

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).

View solution

Q. For absorbing a sparingly soluble gas in a liquid

View solution

Q. Channelling in a packed tower results from the

View solution

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

View solution

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

View solution

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

View solution