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Mass Transfer

Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

Unity
None of these
Zero
Infinity

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Mass Transfer
(NSh/NRe.NSc) is termed in mass transfer operation as the

Momentum diffusivity
Stanton number
Peclet number
Thermal diffusivity

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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
10
1
9

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Mass Transfer
As the reflux ratio decreases, the

Separation becomes more efficient
None of these
Column diameter increases
Number of plates increases

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Mass Transfer
Stacked packing compared to dumped packing

Gives higher pressure drop
Gives lower pressure drop
Both A & B
Provides poorer contact between the fluids

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Mass Transfer
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature.

None of these
Wet bulb
Dew point
Dry bulb

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