In triangular co-ordinates, the ternary composition point falls __________ of the triangle?
Co-current absorbers are usually used when the gas to be dissolved in the liquid is __________?
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system ?
Molecular sieves are regenerated by heating to __________ °C?
Pick out the wrong statement. Generally for physical adsorption, a gas of__________?
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ?
Which of the following is not fixed by the process requirements, in the design of absorbers ?
Reboiler is considered as one theoretical plate, because__________?
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible ?
Large scale drying of wheat is done in a __________ dryer?
With increase in temperature, the leaching rate increases due to__________?
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed__________?
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption?
In an absorption column, the flooding velocity for random packing is __________ that for stacked/regular packing?
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number ?
Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be__________?
Mass transfer co-efficient is defined as__________?
Large quantity of silica gel is normally dried in a __________ dryer?
The value of „L/mG’ ratio for economical absorption operation ranges from __________?
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?
Dried finished product sampled from various parts of a __________ dryer exhibits nonuniformity in the moisture content?
In steam distillation, the __________?
A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?
Which of the following parameters remains constant during chemical dehumidification ?
Coffee is prepared from coffee beans by leaching with__________?
The equation, NA = (DAB . Pt /RTZ) (y1 – y2) is for __________?
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?
The relative volatility of a binary mixture at the Azeotropic composition is __________?
For absorbing a sparingly soluble gas in a liquid, the__________?
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture?
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law?
With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop__________?
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height?
The Knudsen diffusivity is proportional to (where, T = absolute temperature) __________?
Which of the following processes is not an example of adsorption applied to gaseous separations ?
The cooling effect in a cooling tower can be speeded up by __________?
To remove all the moisture from a wet solid it requires exposure to __________ air?
Pore size of the molecular sieve 5A is __________ mm ?
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) ?
Perforated plate towers are unique for solvent extraction because, they provide__________?
The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 – PA2) is for__________?
For the same system, if the same liquid used in an absorber is decreased, the tower height will__________?
The commonly used solvent in supercritical extraction is__________?
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
The mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is __________?
The relative volatility of a binary mixture at constant temperature __________ the total pressure?
__________ equation applies to diffusivities in liquids?
When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used?
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is __________?
H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is __________?
Large scale drying of sugar is done in a __________ dryer?

Pick out the wrong statement ?

A. Absorption factor is constant, when the equilibrium and operating lines are straight
B. In case of a stripper, the equilibrium curve is always below the operating line
C. In case of an absorber, the operating line is always above the equilibrium curve
D. In the absorption of low solubility gases, the liquid film is the controlling resistance

Correct Answer: In case of a stripper, the equilibrium curve is always below the operating line ✔

Last Updated: February 15, 2019