35551. Powdery materials can be guarded against caking tendency on storage by
35552. In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
35553. Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes ?
35554. The temperature of water cooled in cooling tower is always __________ temperature of entering air.
35555. Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?
35556. Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
35557. The relative volatility of a binary mixture at constant temperature __________ the total pressure.
35558. Tower diameter may be decreased by
35559. Rayleigh's equation applies to __________ distillation.
35560. Steady state equimolal counter diffusion is encountered in
35561. Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method ?
35562. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
35563. As the reflux ratio increases, the slope of the operating line for rectifying section
35564. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)
35565. The unit of volumetric diffusivity is
35566. For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.
35567. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.
35568. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is
35569. The slope of 9-line is determined by the
35570. In steam distillation, the
35571. Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?
35572. Steam distillation is used for separation of high boiling
35573. The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will
35574. Rose oil is extracted from rose leaves using __________ distillation.
35575. Hypersorption refers to a __________ process.
35576. Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of two pairs partly soluble (e.g., chlorobenzene-water-methyl ethyl ketone system) ?
35577. Extraction of coffee from its seed is done by
35578. In azeotropic mixture, the equilibrium vapour composition is
35579. With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux
35580. Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
35581. According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)
35582. Dry bulb temperature of the gas is __________ the wet bulb temperature.
35583. Decoction refers to the use of solvent
35584. Flash distillation is suitable for separating the constituents of a binary system, which
35585. The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.
35586. The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2/sec.
35587. Flooding in a column results due to
35588. Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?
35589. A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?
35590. Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled
35591. The process employing desorption of the absorbed solute by a solvent is called
35592. If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are
35593. Which of the following operations does not involve leaching ?
35594. The recovery of pencillin from the acidified fermentation broth is done by
35595. Unit operation involved in the prilling of urea is
35596. Molecular seives are porous
35597. Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.
35598. A binary mixture of benzene and cyclohexane is separated by
35599. Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if
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