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Mass Transfer

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

0.0025
0.25
2.5
1.25

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Mass Transfer
The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)

G/mL
L/mG
LG/m
ML/G

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Mass Transfer
In case of constant underflow extraction operation, the __________ at all solute concentration.

Solids are drained to the same extent
Neither A nor B
Ratio of the insoluble to solution is constant
Both A & B

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Mass Transfer
Which of the following operations does not involve leaching?

Dissolving sugar from the cells of the beet
Dissolving gold from ores
Removing nicotine from its water solution by kerosene
Dissolving pharmaceutical products from bark or roots

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

Less
Same
More
Unpredictable

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Mass Transfer
Rate of leaching increases with increasing

Viscosity of solvent
Pressure
Temperature
Size of the solid

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