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Mass Transfer

Mass Transfer
Leaching of coffee from coffee beans is done by

Hexane
Dilute H₂SO₄ (hot)
Hot water
Lime water

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Mass Transfer
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

Increase 'G' and decrease 'S'
Increase both 'G' and 'S'
Decrease both 'G' and 'S'
Increase 'S' and decrease 'G'

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Mass Transfer
For the same system, if the same liquid used in an absorber is decreased, the tower height will

Remain unaffected
Increase
Decrease or increase ; depends on the type of liquid
Decrease

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Mass Transfer
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)

Straight
Neither A nor B
Both A & B
Parallel

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Mass Transfer
Molecular seives are regenerated by heating to __________ °C.

< 150
200-330
> 1000
> 500

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

Saturated feed is not used
The latent heat of vaporisation of the more and less volatile components are greatly different
A total condenser is used
An azeotrope forms

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