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Mass Transfer

Mass Transfer
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes

?
1
None of these

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Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

0.8 to 1.2
0.5 to 0.8
2.5 to 3.5
1.25 to 2.0

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Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Bubble
Spray
Packed
Tray

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Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is equal to the volumetric diffusivity
Is independent of pressure
Varies directly as the pressure
Varies inversely as the pressure

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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
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Constant rate
Neither A nor B
Unsaturated surface
Both A & B

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