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Mass Transfer

Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

1.5
0.6
-1.5
-0.6

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

8
9
1
10

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Decreases
And the heat required in reboiler decreases
Increases
Remains unaffected

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Mass Transfer
The temperature of water cooled in cooling tower is always __________ temperature of entering air.

More than the wet bulb
Equal to the wet bulb
Equal to the dry bulb
Less than the wet bulb

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Mass Transfer
With increase in temperature, the mutual solubility of two liquids

Remains unchanged
Decreases
Increases
Decreases exponentially

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Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

0.24
1
3.97
600

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