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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D1.5
K ∝ D2
K ∝ D

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Mass Transfer
Molecular seives are porous

Silica
None of these
Alumina
Synthetic zeolites crystals/metal alumino-silicates

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Mass Transfer
As the reflux ratio increases, the slope of the operating line for rectifying section

Decreases
Remains constant
Increases
Data insufficient, cannot be predicted

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Mass Transfer
In case of absorption, both the operating and equilibrium lines will be straight for

None of these
Isothermal operation
Dilute solutions and isothermal operation
Dilute solutions

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Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

Decreases
Increases
May increase or decrease ; depends on individual design
Remains same

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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?

Inorganic solids
Anthracite coal
Rag paper
Bamboo

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