35702. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
35703. An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is
35704. __________ column is used in gas absorption process.
35705. Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.
35706. The throttle position sensor can be checked by
35707. At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
35708. Batch tray dryers suffers from the disadvantage of
35709. In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
35710. In petrol fuel injection system,the two positions of injectors are
35711. The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for
35712. Penetration model (theory) for mass transfer was enunciated by
35713. Surface renewal model of mass transfer was enunciated by
35714. When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.
35715. For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
35716. The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the
35717. Unit of molal diffusivity is
35718. The term "approach" in a cooling tower refers to the difference in the temperature of the
35719. Binary distillation involves the mass transfer by __________ at the gas-liquid interface.
35720. In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
35721. Reverse osmosis is also called
35722. Which of the following is not a batch drier?
35723. Steam distillation is not recommended to be used, if the
35724. Rayleigh equation applies to __________ distillation.
35725. Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as
35726. Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.
35727. __________ is the separation technique used for desalination of sea water.
35728. The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.
35729. Danckwerts developed the __________ theory.
35730. Molecular distillation is
35731. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
35732. Which of the following provides maximum contact surface for a liquid-vapour system?
35733. For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
35734. In stripping section of continuous distillation column, the
35735. Molality is defined as the number of gm moles of solute per __________ of solvent.
35736. __________ is concerned with the adsorption equilibria.
35737. Fractional solvent extraction
35738. 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
35739. Raschig ring made of procelain cannot be used for treating concentrated
35740. H2S present in naphtha reformed gas is removed by absorbing with
35741. During constant rate drying period, vaporisation rate per unit drying surface area
35742. Which type of tool is used to tighten bolt and nut with specified torque?
35743. In rectifying section of a continuous distillation column, the
35744. For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams
35745. According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to
35746. A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is
35747. Minimum reflux ratio in a distillation column results in
35748. Flooding in a distillation column is detected by a sharp
35749. In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)
35750. Two type of fuel supply system used in SI engine are
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