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Mass Transfer

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

D ∝ 1/P
D ∝ P0.5
D ∝ 1/P0.5
D ∝ 1/P1.5

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Mass Transfer
Inside the distillation columns, the

Highest temperatures is near the feed plate
All of these
Vapors are not always at their dew points
Driving force for the liquid flow is its weight

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Mass Transfer
Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.

Packed tower
Bubble cap column
Sieve tray column
Agitated vessel

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Mass Transfer
At constant pressure, with increase of temperature, the dew point will

Remain unchanged
Increase/decrease ; depends on the temperature
Increase
Decrease

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Mass Transfer
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

43835
22190
> 500
200-300

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/t)
(De/t)1/2
(De.t)1/2
(4De/πt)1/2

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