35651. Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?
35652. Coffee is prepared from coffee beans by leaching with
35653. Gaseous diffusion co-efficient increases with increase in the
35654. With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)
35655. Pick out the wrong statement. Raoult's law does not apply, when the
35656. Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.
35657. L/mG is the expression for
35658. Extraction of pencillin employs a __________ extraction coloumn.
35659. In case of gases, the binary diffusivity is proportional to (where, P = pressure)
35660. When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.
35661. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.
35662. If a two phase system is in physical equilibrium; then it means that, the
35663. McCabe-Thiele method of binary distillation does not assume that the
35664. (NSh/NRe.NSc) is termed in mass transfer operation as the
35665. The Hatta number is important in
35666. When a multistage tray tower uses a minimum reflux ratio, it implies
35667. CO2 can be absorbed by
35668. For the same process conditions, the reflux ratio of an unlagged distillation column
35669. An ideal tower packing should not
35670. Which of the following is a suitable absorbent for removal of H2S from natural gas ?
35671. Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are
35672. Schimdt number and Lewis number for pure air at atmospheric conditions are respectively
35673. Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively.
35674. Molecular diffusion is caused by the
35675. At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
35676. Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their
35677. Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
35678. Which of the following equipments is not used in liquid-liquid extraction ?
35679. The function of fly wheel is
35680. Equilibrium-moisture curves of different solids
35681. Azeotropism for ethyl alcohol-water system disappears by
35682. Degree of freedom for leaching and solvent extraction process is
35683. Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the
35684. Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?
35685. In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.
35686. Drying of refractory is normally carried out in a __________ dryer.
35687. The expression, ln(F/W) = is
35688. Heat sensitive materials with very high latent heat of vaporisation may be economically separated using
35689. When the solvent dissolves very little of solute, then
35690. An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is
35691. HETP is numerically equal to HTU, only when the operating line
35692. In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads ?Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point.
35693. Steady state equimolal counter diffusion occurs in case of
35694. JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
35695. The relative saturation of an unsaturated mixture of gas and vapor is independent of the
35696. The adiabatic saturation curve for a vapour-gas mixture is
35697. Excessive end play of the crank shaft is prevented by using
35698. The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is
35699. Drift in a cooling tower is
35700. With increase in the concentration of the adsorbate, the integral heat of adsorption
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