35151. If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that
35152. The rate of mass transfer is not dependent upon the
35153. 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
35154. Dry bulb temperature of unsaturated air is more than its __________ temperature.
35155. 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
35156. The reciprocal of stripping factor is termed as
35157. Ponchan-Savarit method analyses the fractional equipment based on
35158. The binary diffusivity in gases at atmospheric conditions is about
35159. Percentage saturation is __________ the relative saturation.
35160. In case of a desorber (stripper), the
35161. What is the reflux ratio at total reflux ?
35162. Under conditions of flooding in packed tower, the gas pressure drop
35163. 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).
35164. For absorbing a sparingly soluble gas in a liquid
35165. Channelling in a packed tower results from the
35166. 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
35167. The minimum number of theoretical plates is required for achieving a given separation in distillation column with
35168. A good solvent used for absorption should not have very high
35169. In a counter-current liquid extractor
35170. Which of the following is an undesirable property for an absorbing solvent ?
35171. The wetted wall tower is used to determine
35172. Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is
35173. Positive deviation from Raoult's law means a mixture whose total pressure is
35174. With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent
35175. Schmidt number is given by
35176. The caking of crystals can be prevented by
35177. Prandtl number for water at 20°C is about
35178. Boiling point diagram is
35179. When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,
35180. Steam distillation is used to
35181. Freundlich equation applies to the adsorption of solute from
35182. For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.
35183. The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an
35184. The diffusivity (D) in a binary gas mixture is related to the pressure (P) as
35185. A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?
35186. Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent ?
35187. In gas-liquid contact operation, the number of ideal stages, . This is true when the stripping factor 'S' is
35188. The cooling effect in a cooling tower can not be increased by
35189. The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is
35190. The humid volume may be increased by increasing the
35191. ’Biosphere’ was firstly used by
35192. When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.
35193. Large scale drying of wheat is done in a __________ dryer.
35194. Azeotropic distillation is employed to separate
35195. The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
35196. At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes
35197. Use of natural draft cooling tower is practised, when the air has low
35198. Pressure drop through plate tower as compared to that through packed tower, for the same duty will be
35199. Dimension of mass diffusivity is the same as that of
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