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Mass Transfer

Mass Transfer
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is

Unpredictable
More
Less
Same

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Mass Transfer
Stacked packing compared to dumped packing

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

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Mass Transfer
The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

None of these
Heat of wetting
Differential heat of adsorption
Integral heat of adsorption

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Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
2.5
0.0025
1.25

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Mass Transfer
Minimum reflux ratio in a distillation column results in

Minimum number of trays
Minimum reboiler size
Optimum number of trays
Maximum condenser size

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Temperature of the solid
Flow rate of inlet air
Humidity of inlet air
Relative humidity of outlet air

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