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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Kissinevskii
Toor and Marchello
Higbie
Danckwerts

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Mass Transfer
When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

Temperature rises
Pressure falls
Pressure rises
Temperature falls

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Mass Transfer
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

Linearly
Exponentially
Inversely
None of these

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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
9
1
8

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Mass Transfer
Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.

Adiabatic saturation
Dry-bulb
Wet-bulb
Dew point

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Mass Transfer
COâ‚‚ can be absorbed by

Alumina
Heated charcoal
Cold Ca(OH)â‚‚
Hot cupric oxide

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