21351. Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )
21352. __________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.
21353. The expression, y(1 - x)/x(1 - y) is for
21354. In physical terms, Schmidt number means
21355. In case of liquids, the binary diffusivity is proportional to (where, T = temperature)
21356. The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of
21357. Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.
21358. Sand is dried in foundaries in a___drier.
21359. Which of the following employs an accessory known as 'drift eliminator' ?
21360. The Unit of atmospheric pressure is
21361. The number of West flowing rivers in Kerala
21362. Humid volume is the total volume in m3 of 1 kg of
21363. Diameter to height ratio for a rashig ring is
21364. The equipment used in the extraction of highly corrosive radio active liquids is
21365. Advantage of continuous drying over batch drying is that the
21366. With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)
21367. In a packed bed absorption column, the channelling will be noted by the
21368. Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second.
21369. In liquid-liquid extraction, the number of phases at plait point is
21370. In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y = 0.9X, where Y is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer.
21371. The surface renewal frequency in Danckwerts' model of mass transfer is given by (KL: mass transfer co-efficient)
21372. If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.
21373. During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
21374. In case of absorption, both the operating and equilibrium lines will be straight for
21375. Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.
21376. For an absorber, both equilibrium and operating line will be straight for
21377. 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
21378. Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and
21379. Humid volume, at a given temperature is a/an __________ function of humidity.
21380. The Schmidt number which is defined as, μ/ρ D, is the ratio of the
21381. If f is defined as above, then which of the following applies to a feed at dew point ?
21382. Perforated plate towers are unique for solvent extraction because, they provide
21383. In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.
21384. Pick out the wrong statement pertaining to the analogy between equations of heat and mass transfer operations.
21385. The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is
21386. The individual mass transfer co-efficients (moles/m2 . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
21387. Pore size of the molecular seive 5A is __________ mm.
21388. Swenson-Walker crystalliser is a __________ unit
21389. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.
21390. Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in
21391. With increase in temperature, the mutual solubility of two liquids
21392. In which year was the Presidential Rule enforced in Kerala for the first time?
21393. The relative volatility of a binary mixture at the azeotropic composition is
21394. What one consider ......... may be vice to another.?
21395. Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.
21396. Lewis number (Le) is
21397. Which of the following is not a continuous leaching equipment ?
21398. __________ extractor is used for the concentration of radioactive nuclear waste.
21399. Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.
21400. All moisture in a non-hygroscopic material is the __________ moisture.