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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re
Re0.33
Re0.53
Re0.83

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Anthracite coal
Bamboo
Inorganic solids
Rag paper

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

3 to 4
5
1.2 to 1.5
2.5 to 3

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Mass Transfer
Flooding in a column results due to

Low pressure drop
High pressure drop
Low velocity of the liquid
High temperature

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Mass Transfer
Raoult's law is applicable to the

Non-ideal gases
Real solutions
Ideal solutions
Mixture of water and alcohol

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Mass Transfer
Stacked packing compared to dumped packing

Provides poorer contact between the fluids
Both A & B
Gives lower pressure drop
Gives higher pressure drop

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