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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

2
5
0.5
1

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

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Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Unknown
Not required
Calculated
Known

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 + Ro) = Ro/Ri
(1 - Ro) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 - Ri) = Ro/Ri

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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

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

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Mass Transfer
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature.

Dew point
Dry bulb
Wet bulb
None of these

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