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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D0.5
1/D
D
D2

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Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Cost
Porosity
Durability
Size

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Mass Transfer
The unit of volumetric diffusivity is

Cm³/sec
Cm/sec
Cm²/sec
Cm²/seC₂

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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

10
1
8
9

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Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Relative
Molal
None of these
Percentage

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Mass Transfer
__________ columns are used for liquid dispersion in a continuous gas phase.

Packed
Pulse
Sieve plate
Bubble cap

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