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Mass Transfer

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

91.5
99
95
90

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Mass Transfer
Alcohol is dehydrated using __________ distillation.

Azeotropic
Extractive
Molecular
Steam

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Mass Transfer
Which of the following increases during evaporative cooling process with recirculated water supply?

Partial pressure of vapour
Relative humidity
Both B and C
Wet bulb temperature

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Mass Transfer
Pore size of the molecular seive 5A is __________ mm.

0.5
0.05
50
5

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Mass Transfer
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

Marginal decrease in the number of
Major decrease in the number of
No change in theoretical
None of the listed here

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Decreases with time
Does not change with time
Increases with time
Does not affect the moisture content of the wet solid

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