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Mass Transfer

Mass Transfer
H₂S present in naphtha reformed gas is removed by absorbing with

Vacuum gas oil
HCl
Ethanolamine
K₂CO₃

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Mass Transfer
Minimum reflux ratio in a distillation column results in

Maximum condenser size
Optimum number of trays
Minimum reboiler size
Minimum number of trays

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Mass Transfer
Stefan's law describes the mass transfer by

Diffusion
Neither A nor B
Bulk flow
Both A & B

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Mass Transfer
Mass transfer co-efficient is defined as

Flux = Co-efficient/concentration difference
None of the listed here
Co-efficient = Flux/concentration difference
Flux=concentration difference/co-effi-cient

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Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Pressure drop in the column is very high
Operating line lies below the equilibrium line
Operating line lies above the equilibrium line
Both operating and equilibrium lines are parallel

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

Dependent on the Reynolds number
D/2a
Proportional to √D
D/a

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MORE MCQ ON Mass Transfer

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