Learn Mass Transfer MCQ Questions with answers and solutions.

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Q.

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 hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

(A) Lower than
(B) Higher than
(C) Same as
(D) Either same or higher than

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Q. Freundlich equation applies to the adsorption of solute from

(A) Dilute solutions, over a small concentration range
(B) Gaseous solutions at high pressure
(C) Concentrated solutions
(D) None of these

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Q. Packed column distillation is limited to the column __________ metres.

(A) Height < 6
(B) Diameter < 0.6
(C) Both A & B
(D) Neither A nor B

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Q. The relative volatility of a binary mixture at the azeotropic composition is

(A) 1
(B) > 1
(C) 0
(D) ∞

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Q. Flights in a rotary dryer are provided to

(A) Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
(B) Reduce the residence time of solid
(C) Increase the residence time of the solid
(D) None of these

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Q. 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

(A) 25%
(B) 50%
(C) 70%
(D) 90%

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Q. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

(A) Packed
(B) Bubble
(C) Spray
(D) Tray

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Q. 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.

(A) Less than
(B) More than
(C) Same as
(D) None of these

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Q. 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

(A) Humidified
(B) Cooled
(C) Dehumidified
(D) Both A & B

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Q. The boiling points of pure components of a binary system __________ with increase in total pressure of the system.

(A) Decreases
(B) Increases
(C) Remains unchanged
(D) May increase or decrease, depends on the system

Mass Transfer MCQs with answers Page - 8

Q. Freundlich equation applies to the adsorption of solute from

Q. Packed column distillation is limited to the column __________ metres.

Q. The relative volatility of a binary mixture at the azeotropic composition is

Q. Flights in a rotary dryer are provided to

Q. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Q. 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.

Q. 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

Q. The boiling points of pure components of a binary system __________ with increase in total pressure of the system.

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