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Mass Transfer

Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

95
91.5
99
90

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Wetted wall tower
Bubble cap tower
Grid tray tower
Perforated tray tower

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

Yes ; but height of cooling tower will be prohibitively high
Yes ; but the air flow rate should be excessively high
No
Yes

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Absorption
Distillation
None of these
Solvent extraction

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Mass Transfer
The caking of crystals can be prevented by

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

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Mass Transfer
With increase in temperature, the leaching rate increases because of the

Both Decreased viscosity of liquid & Increased diffusivity
None of the listed here
Increased diffusivity
Decreased viscosity of liquid

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