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Mass Transfer

Mass Transfer
Large scale drying of sugar is done in a __________ dryer.

Rotary
Truck
Spouted bed
Tray

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Mass Transfer
The vapour pressure exerted by the moisture contained in a wet solid depends upon the

Temperature
Nature of the moisture
Nature of the solid
All of these

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P0.5
D ∝ 1/P
D ∝ P0.5
D ∝ 1/P1.5

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Mass Transfer
Water entrained by circulating air in cooling towers is termed as

Drift
Vapor load
Blow down
None of the listed here

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Mass Transfer
Inside the distillation columns, the

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

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Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Approach is 10°F
Both A & B
Neither A nor B
Range is 15°F

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