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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1 to 5
> 10
1
5 to 10

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Mass Transfer
Equilibrium-moisture curves of different solids

Depend on the humidity of the gas
None of these
Are different
Are same

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Rag paper
Bamboo
Inorganic solids
Anthracite coal

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

50
500
1000
100

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Mass Transfer
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

Absorption
Evaporation
Liquid extraction
Distillation

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Mass Transfer
Plate efficiency in a distillation column is reduced due to the __________ of liquid.

Entrainment
All of these
Foaming
Weeping & dumping

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