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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/P1.5
D ∝ 1/P0.5
D ∝ P0.5
D ∝ 1/P

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Mass Transfer
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

Neither A nor B
Is one at unity value of
Both A and B
Increases with increase in

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Mass Transfer
__________ equation applies to diffusivities in liquids.

Wilke and Chang
None of these
Gilliland
Hirschfelder

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Mass Transfer
Rotary dryers cannot handle __________ materials.

Free flowing
Grannular
Sticky
Dry

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

L/(FG.G)
F/(FG.a)
(G.a)/FG
FG/(G.a)

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Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

None of these
Spray
Indirect tray
Freeze

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