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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Danckwerts
Toor and Marchello
Stefan
Fick

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

1
< 1
> 1

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

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

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Mass Transfer
Which of the following parameters remains constant during chemical dehumidifica-tion?

Wet bulb temperature
None of these
Dry bulb temperature
Partial pressure of vapour

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Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm.

Hydrochloric acid-water
Benzene-toluene
All of these
Ethyl alcohol-water

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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?

Bamboo
Rag paper
Anthracite coal
Inorganic solids

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