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Mass Transfer

Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

-1
1
+ ve
- ve

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Mass Transfer
During the constant rate period of drying of a solid,

Increased air humidity decreases the rate of drying
Increasing the air temperature decreases the drying rate
None of these
Surface evaporation of unbound moisture occurs

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Mass Transfer
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are

Both A & B
Parallel
Neither A nor B
Straight

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Mass Transfer
Diameter to height ratio for a rashig ring is

0.5
2
1
5

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

Optimum
None of these
Infinite
Minimum

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Mass Transfer
Weeping in a distillation column

Results due to very high gas velocity
Increases tray efficiency
Provides large interfacial surface for mass transfer
Results due to very low gas velocity

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