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Mass Transfer

Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

D ∝ T2
D ∝ T0.5
D ∝ T
D ∝ T1.5

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Mass Transfer
Which of the following same diameter columns gives lowest pressure drop per unit height?

Packed column (stacked)
Bubble-cap column
Randomly packed column
Sieve-plate column

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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

8
1
9
10

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.53
Re0.83
Re0.33
Re

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Mass Transfer
Ion exchange process is similar to

Extraction
Absorption
Leaching
Adsorption

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Mass Transfer
Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.

Less than
Equal to
Either A or B; depends on the solid
More than

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