Mass Transfer Quiz 2

As per Gilliland?s equation, the diffusivity is_____?

Binary distillation involves the mass transfer by ________ at the gas-liquid interface?

Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is___________?

Coffee is prepared from coffee beans by leaching with______?

Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid) ?

Capacity of a rotary dryer depends on its ___________?

At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is _________ percent.?

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

Calculation of mass transfer co-efficient is mostly/normally done using _______ theory?

Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively ?

At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?

At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is__________?

Batch tray dryers suffers from the disadvantage of________?

At 750?K and 1 atm, the approximate value of Schmidt number for air is__________?

An Azeotropic mixture is a _________ mixture?

Can the efficiency of a plate in the distillation tower be greater than 100% ?

Co-current absorbers are usually used when the gas to be dissolved in the liquid is _____?

Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the ________ number?

An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ______?

At ___________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation?

Blowdown in a cooling tower______?

Channelling is most severe_______?

At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid ________ that in dry packed tower ?

At minimum reflux ratio for a given separation___________?

At a fixed total pressure, humidity depends only on the _________?

Bound moisture is that liquid which exerts an equilibrium vapor pressure _________ that of the pure liquid at the given temperature ?

Bollman extractor_____?

At constant pressure, with increase of temperature, the dew point will __________?

As the reflux ratio decreases, the__________?

Berl saddle made of carbon cannot be used for _____?

Back-trapping in a distillation column ?

Ammonia present in the coke oven gas is removed by washing with_____?

An example of elution is________?

Azeotropism for ethyl alcohol-water system disappears by_______?

An ideal tower packing should not _________?

All moisture in a non-hygroscopic material is the _________ moisture?

At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes_______?

Channelling in a packed tower results from the_______?

Ammonia present in the coke oven gas is removed by washing with_____?

As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches ______?

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

Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the _________ number?

Can the efficiency of a plate in the distillation tower be greater than 100% ?

CO2 can be absorbed by______?

At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent ___________?

As the reflux ratio in a distillation column is increased from the minimum, the________?

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?

Boiling point diagram is not affected by the ambient________?

Blowdown in a cooling tower___________?

At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes________?