Mass Transfer - Study Mode

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[#351] With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

(A) Increases

(B) Decreases

(C) Decreases linearly

(D) Remains unaffected

Correct Answer

(A) Increases

[#352] During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the

(A) Gas film

(B) Liquid film

(C) Liquid-gas interface

(D) None of these

Correct Answer

(B) Liquid film

[#353] 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

(A) 0.4

(B) 0.25

(C) 0.2

(D) 0.175

Correct Answer

(C) 0.2

[#354] Which of the following quantities need not be fixed before starting the design of a co-current absorber?

(A) Heat gain or loss

(B) Flow rate of entering liquid

(C) Flow rate of gas

(D) None of these

Correct Answer

(B) Flow rate of entering liquid

[#355] In azeotropic mixture, the equilibrium vapour composition is

(A) More than liquid composition

(B) Less than liquid composition

(C) Same as liquid composition

(D) Independent of pressure

Correct Answer

(C) Same as liquid composition