Mass Transfer Quiz 4

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) ?

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

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

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

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

Heat load in a cooling tower________?

Freundlich equation applies to the adsorption of solute from_______?

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

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

Gaseous diffusion co-efficient increases with increase in the_______?

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

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

For a binary mixture with low relative volatility_____?

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

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

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

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

Freundlich equation applies to the adsorption of solute from_____?

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

For a binary mixture with low relative volatility_________?

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

For water-ethanol system, the minimum reflux ratio_______?

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

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

For absorbers, high pressure drop results in_____?

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

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

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

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?

Flooding in a column results due to_____?

For absorbing a sparingly soluble gas in a liquid _____?

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

Flights in a rotary dryer are provided to_________?

Henry?s law states that the __________?

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

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

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

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

Fractional solvent extraction________?

For a distillation column operating at minimum reflux, the_________?

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

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

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

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 contacting a highly soluble gas with a liquid ______?

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