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Mass Transfer

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

1
3.97
600
0.24

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Mass Transfer
In physical terms, Schmidt number means

Mass diffusivity/thermal diffusivity
Thermal diffusivity/mass diffusivity
Thermal diffusivity/momentum diffusivity
Momentum diffusivity/mass diffusivity

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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
Large latent heat
None of these

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Mass Transfer
Use of packed towers for distillation is generally limited to the

Small sizes
Vacuum distillation
High pressure operation
Multicomponent distillation

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Mass Transfer
During the constant rate period of drying of a solid,

Increased air humidity decreases the rate of drying
None of these
Increasing the air temperature decreases the drying rate
Surface evaporation of unbound moisture occurs

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Mass Transfer
Physical absorption is

An irreversible phenomenon
A reversible phenomenon
Both B & C
Accompanied by evolution of heat

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MORE MCQ ON Mass Transfer

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