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Mass Transfer

Mass Transfer
Langmuir equation is associated with

Steam distillation
Leaching
Adsorption
Multicomponent absorption

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Mass diffusivity to momentum diffusivity
Thermal diffusivity to mass diffusivity
None of these
Momentum diffusivity to thermal diffusivity

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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
0.048
0.079
0.122

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Mass Transfer
Weeping in a distillation column

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

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Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

Freeze
None of these
Spray
Indirect tray

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

8
12
2
18

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