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Mass Transfer

Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F
2f
F/2
1/f

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Mass Transfer
1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

0.175
0.4
0.2
0.25

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Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S > 1
S = ∞
S < 1
S = 1

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Mass Transfer
The most common packing used in industrial operations is __________ rings.

Lessing
Single spiral
Cross-partition
Raschig

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Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

Heat gain or loss
None of the listed here
Flow rate of gas
Flow rate of entering liquid

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Mass Transfer
What is the reflux ratio at total reflux?

Data insufficient
Zero
Unity
Infinity

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