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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

5 to 10
1 to 5
1
> 10

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Mass Transfer
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.

2
12
8
18

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Mass Transfer
Which of the following unit operations makes use of Thiele-Geddes equation?

Multicomponent distillation
Liquid-liquid extraction
Solid-liquid extraction
Multicomponent absorption with chemical reaction

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Mass Transfer
Molecular diffusivity of a liquid

May increase or decrease with temperature
Decreases with temperature
Is independent of temperature
Increases with temperature

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

1
9
8
10

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Mass Transfer
Reverse osmosis is also called

Ultrafiltration
Dialysis
Diffusion
Electrodilysis

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