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Mass Transfer

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

F/2
1/f
F
2f

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Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

√T and T3/2
T3/2 and √T
T3/2 and T
T and T3/2

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Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

44119
30-40
70-80
90-100

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Increased reflux ratio
Greater degree of separation with a fixed number of trays
Increased reboiler load
None of these

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Mass Transfer
Stage efficiency in a leaching process depends on the

Time of contact between the solid and the solution
Rate of diffusion of the solute through the solid and into the liquid
Vapour pressure of the solution
Both A & B

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Mass Transfer
In McCabe-Thiele method, at infinite reflux ratio

Neither A nor B
Both A & B
The overhead product is minimum
Both the operating lines coincide with diagonal

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