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Mass Transfer

Mass Transfer
Alcohol is dehydrated using __________ distillation.

Azeotropic
Extractive
Steam
Molecular

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

Chemical properties
Degree of turbulence
Physical properties
Interfacial area

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

>1 and ≈ 1
< 1 and ≈ 1
0 and ≈ 1
1 and 0

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

(G.a)/FG
F/(FG.a)
FG/(G.a)
L/(FG.G)

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Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher relative humidity
Higher dew point
Higher wet bulb temperature
Higher absolute (specific) humidity

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Avoid flooding
Minimise the overall pressure drop
Reduce liquid hold up
Avoid channeling

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MORE MCQ ON Mass Transfer

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