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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Fick
Danckwerts
Stefan

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

Non-uniform & low production rate
All of the listed here
High labour cost & low heat economy
High maintenance cost

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Mass Transfer
Overall efficiency of the distillation column is

Same as the Murphree efficiency
The ratio of number of actual plates to ideal plates
Always more than the point efficiency
The ratio of number of ideal plates to actual plates

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Mass Transfer
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the

Gas film
None of these
Liquid-gas interface
Liquid film

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

51 min
94 min
15 min
71 min

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Mass Transfer
Leaching of uranium ore and gold ore is done in

Bollman extractor
Centrifugal extractor
None of these
Pachuka tanks

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MORE MCQ ON Mass Transfer

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