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Mass Transfer

Mass Transfer
Leaching of coarse solid lumps is also termed as

Percolation
Decoction
Dissolution
Agitation and settling

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Mass Transfer
The caking of crystals can be prevented by

Maintaining low critical humidity
Coating the product with inert material
Both A and C
Maintaining high critical humidity

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

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Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Packed
Wetted wall
Perforated tray
Bubble cap

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Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of actual plates to ideal plates
Same as the Murphree efficiency
The ratio of number of ideal plates to actual plates
Always more than the point efficiency

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = a₂
None of these
a₁ = 2a₂
a₁ = 0.5 a₂

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