Mass Transfer Quiz 4

For the same process conditions, the reflux ratio of an unlagged distillation column_____?

For a distillation column operating at minimum reflux, the_________?

For which of the following unit operations, Lewis number is of significance ?

For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

For the flow of gases through a capillary, with increase in temperature, the permeability ___________ as per Knudsen law?

Henry?s law states that the __________?

For ________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same?

For water-ethanol system, the minimum reflux ratio_______?

For stripping of a gas in a counter current stripper, the operating line _______?

Freundlich equation applies to the adsorption of solute from_______?

Flights in a rotary dryer are provided to_________?

For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ______ plate requirement?

For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is_____?

Flooding in a distillation column is detected by a sharp _____?

For the same system, if the same liquid used in an absorber is decreased, the tower height will___________?

For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of ________ microns (1 mm = 1000 microns)?

For absorbing a sparingly soluble gas in a liquid, the_______?

For an absorber, both equilibrium and operating line will be straight for _________?

For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause _______ plate requirement?

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using___________?

For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will_______?

Gaseous diffusivity at atmospheric pressure is of the order of _______ cm2/second?

For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a _____ of the equilateral triangular co-ordinates?

Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1?F is called the_________?

For contacting a highly soluble gas with a liquid ______?

For absorbers, high pressure drop results in_____?

Freundlich equation applies to the adsorption of solute from_____?

For a binary mixture with low relative volatility, continuous rectification to get pure products will require_______?

H2S present in naphtha reformed gas is removed by absorbing with_____?

High pressure at the bottom of a distillation tower handling heat sensitive materials results in _______?

For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as_____?

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is ________ the liquid head available in the downcomer?

Free flowing granular materials can be best dried in a ___________ drier?

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 _____?

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___________?

For absorbing a sparingly soluble gas in a liquid _____?

For a single component absorber, the operating line is straight only when plotted in term of _______ units?

Flooding in a column results due to_____?

For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a ________ of the equilateral triangular co-ordinates?

For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because___________?

Fractional solvent extraction________?

Gaseous diffusion co-efficient increases with increase in the_______?

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around______?

For continuous drying of granular or crystalline material, the dryer used is the ________ dryer?

High pressure at the bottom of a distillation tower handling heat sensitive materials results in______?

Heat load in a cooling tower________?

For a binary mixture with low relative volatility_________?

For a binary mixture with low relative volatility_____?

HETP is numerically equal to HTU, only when the operating line ________?

For gas absorption, low viscosity solvents are preferred, because of their ______?