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Mass Transfer

Mass Transfer
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

μ²
√μ
μ
1/μ

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Mass Transfer
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

Increases
Decreases
Remains same
Increases linearly

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Mass Transfer
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.

8
2
12
18

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Mass Transfer
Chemisorption compared to physical absorption has

Lower capacity of the solvent for the solute gas
Lower adsorption rate
Increased utilisation of stagnant zones of the liquid phase
None of these

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.152
0.079
0.122
0.048

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Mass Transfer
Degree of freedom for leaching and solvent extraction process is

3
1
2

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