0% 0 Mass Transfer Quiz 9 1 / 50 Separation of two or more components of a liquid solution cannot be achieved by_____? Evaporation Liquid extraction Fractional crystallisation Absorption 2 / 50 Pressure drop through plate tower as compared to that through packed tower, for the same duty will be_____? More Either A. or B.; depends on the packing height Equal Less 3 / 50 Reverse osmosis is also called__________? Diffusion Electrodialysis Ultra-filtration Dialysis 4 / 50 Refractory bricks are usually dried in a _________ dryer? Festoon Tray Conveyor Tunnel 5 / 50 Prandtl number for water at 20?C is about _________? 70 0.7 7 150 6 / 50 Ponchon-Savarit method analyses the fractional equipment based on_____? The assumption of constant molal-overflow Material balance only Both enthalpy and material balances Enthalpy balance only 7 / 50 Small dia distillation column can be a ___________? Any of these Bubble cap Packed column Sieve tray 8 / 50 Radioactive nuclear waste is treated in______? Pulsed column extractor Rotating-disc contactor Mixer-settler extractor Bollman extractor 9 / 50 Rayleigh?s equation applies to _________ distillation? Flash Steam Differential Continuous 10 / 50 Separation of two volatile liquids by distillation makes use of their__________? Relative volatility Selectivity Solubility Density difference 11 / 50 Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their______? Viscosity Relative volatility Density Solubility 12 / 50 Rayleigh equation applies to __________ distillation ? Flash Equilibrium Differential Molecular 13 / 50 Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent ________? A pure component A ternary mixture A binary mixture Partially miscible ternary system 14 / 50 Rotary dryers cannot handle ________ materials ? Free flowing Dry Granular Sticky 15 / 50 Raoult?s law applies to the_____? Non-volatile solute Solvents Non-ideal solution only All liquid solutions 16 / 50 Reboiler is considered as one theoretical plate, because_______? Of the assumption that vapour and liquid leaving the reboiler are in equilibrium Vapour is recycled to the column Reboiler itself contains one plate None of these 17 / 50 Rayleigh?s equation applies to __________ distillation? Flash Continuous Differential Steam 18 / 50 Relative humidity is the ratio of the________? Partial pressure of the vapour to the vapour pressure of the liquid at room temperature Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature Actual humidity to saturation humidity None of these 19 / 50 Raoult?s law is applicable to the_______? Non-ideal gases Mixture of water and alcohol Real solutions Ideal solutions 20 / 50 Powdery materials can be guarded against caking tendency on storage by__________? Providing minimum percentage of voids Having maximum possible points of contact None of these Providing irregular grain size 21 / 50 Rate of leaching increases with increasing________? Temperature Pressure Size of the solid Viscosity of solvent 22 / 50 Schmidt number and Lewis number for pure air at atmospheric conditions are respectively___________? 1 and 0 > 1 and ? 1 < 1 and ? 1 0 and ? 1 23 / 50 Sand is dried in foundries in a ________drier? Rotary Spray Vacuum Fluidised bed 24 / 50 Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the _________ of a fibre ? Strength None of these Thermal conductivity Electrical resistance 25 / 50 Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ?A? to that of component ?B?, when__________? Only liquid phase obeys Dalton?s law Only vapor phase follows Raoult?s law Vapor phase obeys Dalton?s law and liquid phase obeys Raoult?s law Liquid phase obeys Dalton?s law and vapor phase obeys Raoult?s law 26 / 50 Plate efficiency_________? Increases due to liquid entrainment Is a function of the mass transfer between liquid and vapour Increases due to weeping and dumping of liquid Increases due to foaming 27 / 50 Plate efficiency in a distillation column is reduced due to the _______ of liquid? Foaming All A., B. & C. Entrainment Weeping & dumping 28 / 50 Schmidt number is given by _____? Sh ? Pe Re ? Pe ?/?DAB Re/Pe 29 / 50 Raschig ring made of porcelain cannot be used for treating concentrated_____? Nitric acid Sulphuric acid Hydrochloric acid Alkalis 30 / 50 Solvent used in extractive distillation_____? Should be of high volatility Should form azeotropes with the original components All A., B. and C. Changes the relative volatility of the original components 31 / 50 Priming in a distillation column__________? Reduces the overall pressure drop Is characterised by the presence of foam throughout the space between trays Results from very low gas velocity Is desirable from point efficiency consideration 32 / 50 Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the______? Viscosity variation of the fluids may cause channelling/flooding None of these Pressure drop in the equipment will be very high Packing may be crushed due to thermal expansion/contraction of the components of the equipments 33 / 50 Pick out the wrong statement? The operating line always lies above the equilibrium solubility curve in case of a single component absorber The solubility of a particular gas in ideal solution in any solvent is always the same The operating line always lies below the equilibrium solubility curve in case of a single component stripper The operating pressure in solvent extraction system should be below vapor pressures of all components 34 / 50 Removal of _______ exemplifies an adsorption unit operation? Mustard oil from mustard seed Water from petrol Ammonia from coke oven gas Uranium from its ore 35 / 50 Pore size of the molecular sieve 5A is ______ mm ? 5 50 0.05 0.5 36 / 50 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 ? Availability Toxicity Selectivity Cost 37 / 50 Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when______? Extracting solvent is cheaply & abundantly available One of the liquid components is heat sensitive One of the liquid components has very high affinity towards the solvent Viscosity of liquid components is very high 38 / 50 Powdery materials can be guarded against caking tendency on storage by_____? Providing irregular grain size Having maximum possible points of contact Providing minimum percentage of voids None of these 39 / 50 Raoult?s law does not apply, when the_____? Component molecules are non-polar Chemical combination or molecular association between unlike molecules takes place in the formation of solution Size of component molecules are not equal Attractive forces between like and unlike molecules in the solution are approximately equal 40 / 50 Rose oil is extracted from rose leaves using _____ distillation? Extractive Low pressure High pressure Steam 41 / 50 Separation of the isotopes of helium for scientific investigations is done by_______? Leaching Thermal diffusion Reverse osmosis Solvent extraction 42 / 50 Selectivity of the solvent used in solvent extraction should be)__________? < 1 1 > 1 0 43 / 50 Solvent used in extractive distillation___________? Forms a high boiling azeotrope Does not alter the relative volatility of the original components Forms a low boiling azeotrope Is of low volatility 44 / 50 Positive deviation from Raoult?s law means a mixture whose total pressure is_____? Less than that computed for ideality None of these Greater than that computed for ideality Less than the sum of the vapour pressure of the components 45 / 50 Sodium bicarbonate is produced during soda ash manufacture using a ________ tower? Baffle Plate Packed None of these 46 / 50 Plate efficiency in a distillation column is reduced due to the ________ of liquid? Foaming Entrainment All A., B. & C. Weeping & dumping 47 / 50 Relative volatility does not change appreciably with the change in_______? None of these Vapour pressure of either component Temperature Total pressure 48 / 50 Separation of two volatile liquids by distillation makes use of their_____? Selectivity Density difference Relative volatility Solubility 49 / 50 Pick out the wrong statement? With decrease in the liquid flow rate for a fixed gas flow rate, the slope of the operating line decreases, in case of gas absorption process The average distance between the operating line and equilibrium line is large, when the liquidgas ratio is also large in case of a counter current gas absorption tower When the concentration difference for the mass transfer becomes zero at the bottom of the gas absorption tower, then the upper end of the operating line touches the equilibrium curve The operating line lies above the equilibrium curve in case of a gas desorber 50 / 50 Smoke is an example of _____? Liquid dispersed in gas Solid dispersed in gas Gas dispersed in liquid Solid dispersed in liquid Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMass Transfer Quiz 8 Mass Transfer Quiz 10Next
