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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

1.25
2.5
0.25
0.0025

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

Both plug & perfectly mixed
Perfectly mixed
None of the listed here
Plug

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

None of these
Bollman extractor
Centrifugal extractor
Pachuka tanks

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Mass Transfer
Perforated plate towers are unique for solvent extraction because, they provide

Better contact of the phase
Repeated coalescence & redispersion of the drop phase
Higher contact area
None of these

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Mass Transfer
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

Less
Equal
More
Either A or B; depends on the packing height

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Mass Transfer
Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

Interfacial area
Physical properties
Degree of turbulence
Chemical properties

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