21501. The diameter of a piston is three inches,in metric system the diameter is
21502. According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)
21503. For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be
21504. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is
21505. Packed column distillation is limited to the column __________ metres.
21506. For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.
21507. Which of the following is directly concerned with psychrometry ?
21508. Plate efficiency in a distillation column is reduced due to the __________ of liquid.
21509. The most efficient cooling tower out of the following is
21510. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
21511. Powdery materials can be guarded against caking tendency on storage by
21512. In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
21513. Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes ?
21514. The temperature of water cooled in cooling tower is always __________ temperature of entering air.
21515. 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?
21516. Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
21517. The relative volatility of a binary mixture at constant temperature __________ the total pressure.
21518. Tower diameter may be decreased by
21519. Rayleigh's equation applies to __________ distillation.
21520. Steady state equimolal counter diffusion is encountered in
21521. Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method ?
21522. 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 ?
21523. As the reflux ratio increases, the slope of the operating line for rectifying section
21524. 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)
21525. The unit of volumetric diffusivity is
21526. For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.
21527. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.
21528. 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
21529. The slope of 9-line is determined by the
21530. In steam distillation, the
21531. 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 ?
21532. Steam distillation is used for separation of high boiling
21533. 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
21534. Rose oil is extracted from rose leaves using __________ distillation.
21535. Hypersorption refers to a __________ process.
21536. 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) ?
21537. Extraction of coffee from its seed is done by
21538. In azeotropic mixture, the equilibrium vapour composition is
21539. With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux
21540. Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
21541. According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)
21542. Dry bulb temperature of the gas is __________ the wet bulb temperature.
21543. Decoction refers to the use of solvent
21544. Flash distillation is suitable for separating the constituents of a binary system, which
21545. The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.
21546. The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2/sec.
21547. Flooding in a column results due to
21548. Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?
21549. 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?
21550. 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