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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Stefan
Danckwerts
Toor and Marchello
Fick

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Mass Transfer
Molarity is defined as the number of gm moles of solute per __________ of solvent.

Gm
Kg
c
Litre

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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)

Both A & B
Neither A nor B
Parallel
Straight

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Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

Highly humid
Perfectly dry
None of these
High temperature

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Mass Transfer
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Liquid side
Interfacial
Gas side
Both liquid and gas side

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

2.5 to 3
5
1.2 to 1.5
3 to 4

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