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Mass Transfer

Mass Transfer
Stefan's law describes the mass transfer by

Both A & B
Bulk flow
Diffusion
Neither A nor B

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Mass Transfer
Make up water is supplied during cooling tower operation to compensate for water losses due to

Entrainment
Blowdown
Evaporation
All of these

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De.t)1/2
(4De/πt)1/2
(4De/t)
(De/t)1/2

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Mass Transfer
When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

1
< 1
?
> 1

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Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

Penetration
None of the listed here
Film
Surface renewal

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Mass Transfer
The critical moisture content in case of drying indicates the __________ rate period.

End of falling
Beginning of falling
Beginning of constant
None of these

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