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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

70
7
0.7
150

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.

Penetration
None of these
Film
Surface-renewal

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

T
√T
T²
T⁴

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Mass Transfer
Drift in a cooling tower is

Dependent on the water lost by evaporation
The water entrained by the circulating air
Desirable
All of these

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

Rotary
None of these
Fluidised bed
Tray

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Mass Transfer
Inside the distillation columns, the

Driving force for the liquid flow is its weight
Vapors are not always at their dew points
All of these
Highest temperatures is near the feed plate

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