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Mass Transfer

Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

600
3.97
0.24
1

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Mass Transfer
Raschig ring made of procelain cannot be used for treating concentrated

Hydrochloric acid
Nitric acid
Sulphuric acid
Alkalis

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

√T
T²
T³
T

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Low viscosity
Small latent heat
None of these
Large latent heat

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Mass Transfer
Which of the following solutions will follow Raoult's law most closely?

A solution of benzene, toluene and oxylene
35% solution of camphor in water
35% solution of NH₃ in water
A solution of polar organic compounds (not of homologs of a series)

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

Humidified with wet bulb temperature decreasing
Humidified at constant wet bulb temperature
Dehumidified
None of these

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