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You Are On Multi Choice Question Bank SET 431

21551. The process employing desorption of the absorbed solute by a solvent is called





21552. If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are





21553. Which of the following operations does not involve leaching ?





21554. The recovery of pencillin from the acidified fermentation broth is done by





21555. Unit operation involved in the prilling of urea is





21556. Molecular seives are porous





21557. Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.





21558. A binary mixture of benzene and cyclohexane is separated by





21559. 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





21560. Cox chart is useful in the design of





21561. Dew point of an air-water vapor mixture






21562. Can a cooling tower cool water below the wet bulb temperature of inlet air ?





21563. The solvent used in liquid-liquid extraction should have __________ less than one.





21564. The suitable evaporator for concentration of foaming liquids is a __________ evaporator.





21565. The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.





21566. Tea percolation employs





21567. Which of the following assumes constant molal vaporisation and overflow ?





21568. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be





21569. Selectivity of the solvent used in solvent extraction should be





21570. Pick out the wrong statement pertaining to leaching.





21571. Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.





21572. NSc/NPr is called the





21573. McCabe-Thiele method





21574. The film penetration model of mass transfer was enunciated by





21575. The most economical range of absorption factor is





21576. Channelling is most severe





21577. Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is





21578. 'ADDUCTS' and 'CLATHRATES' are used in case of





21579. Adsorption is an unit operation which generally involves __________ systems.





21580. In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.





21581. Separation of the isotopes of helium for scientific investigations is done by





21582. In a binary system, separation is very efficient, when the relative volatility is





21583. Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for





21584. The binary diffusivity in gases does not depend upon the





21585. Berl saddle made of carbon cannot be used for





21586. 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is





21587. During drying of a solid, the critical moisture content increases with





21588. Priming in a distillation column





21589. The commonly used solvent in supercritical extraction is





21590. When the liquid over a plate is of uniform concentration, then





21591. In saturated gas, the





21592. As per Gilliland's equation, the diffusivity is





21593. In the radiator pressure cap contains





21594. A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.





21595. Which of the following is not fixed by the process requirements, in the design of absorbers ?





21596. If the amount of the steam used in steam distillation is increased, the temperature of distillation





21597. Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.





21598. Inside the distillation columns, the





21599. When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.





21600. Desirable value of absorption factor in an absorber is





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