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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

1/D
D
D2
D0.5

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Mass Transfer
In batch distillation with constant reflux, overhead product composition __________ with time.

Increases
May increase on decrease, depends on the system
Decreases
Does not vary

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Mass Transfer
Boiling point diagram is not affected by the ambient

Pressure
Temperature
Humidity
Both B and C

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

Lessing
Cross-partition
Single spiral
Raschig

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Mass Transfer
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

Increases Linearly
Increases
Remains unaffected
Decreases

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 8 : 1
> 8:1
> 4 :1
< 6:1

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