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Mass Transfer

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

600
1
3.97
0.24

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Mass Transfer
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.

Critical
Unbound
None of these
Bound

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Increased reboiler load
Increased reflux ratio
Greater degree of separation with a fixed number of trays
None of these

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Mass Transfer
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.

Steam
Continuous
Azerotropic
None of these

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Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Form constant boiling azeotrope
Have very close boiling points
Have very wide boiling points
Form minimum boiling azeotrope

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Infinite
Zero
Maximum
Minimum

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