Question: For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because [A]. water has a high latent heat of evaporation. [B]. Lewis number is close to unity. [C]. they…

Question: In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when [A]. saturated feed is not used. [B]. an azeotrope forms. [C]. the latent heat of vaporisation of the more and less volatile components…

Question: Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) [A]. (De.t)1/2 [B]. (De/t)1/2 [C]. (4De/πt)1/2 [D]. (4De/t) Answer: Option C Explanation: No answer description available for this question.

Question: Which of the following provides maximum contact surface for a liquid-vapour system? [A]. Packed tower [B]. Bubble-cap plate column [C]. Seive-plate column [D]. Wetted wall column Answer: Option A Explanation: No answer description available for this question.

Question: 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…

Question: At 750°K and 1 atm, the approximate value of Schmidt number for air is [A]. 0.01 [B]. 0.1 [C]. 1 [D]. 10 Answer: Option B Explanation: No answer description available for this question.

Question: In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be [A]. at ground level. [B].…

Question: In an operating distillation column, the [A]. vapors and liquids are at their dew point and bubble point respectively [B]. driving force for the liquid flow is its specific weight. [C]. driving force for the vapor flow is the…

Question: At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent. [A]. 100 [B]. 0 [C]. 50 [D]. between 0 and 100 Answer: Option B…

Question: In most of the vacuum crystalliser, vacuum is generally produced by means of a [A]. suction pump [B]. compressed air jet [C]. steam jet ejector with a barometric condenser [D]. none of these Answer: Option C Explanation: No answer…