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Mass Transfer

Mass Transfer
Sticky material can be dried in a __________ dryer.

Rotary
Tray
None of these
Fluidised bed

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Mass Transfer
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

Less
Either A or B; depends on the packing height
More
Equal

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Mass Transfer
Weeping in a distillation column

Provides large interfacial surface for mass transfer
Results due to very high gas velocity
Results due to very low gas velocity
Increases tray efficiency

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Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.01
0.1
> 1
10-5 to 10-6

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Mass Transfer
Fenske equation determines the

Minimum number of theoretical plates
Optimum reflux ratio
Maximum number of ideal plates
Height of the distillation column

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Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T²
√T
T
T⁴

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