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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

> 1
0.01
10-5 to 10-6
0.1

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

0.72
0.6
1
0.24

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Mass Transfer
Weeping in a distillation column

Increases tray efficiency
Results due to very low gas velocity
Results due to very high gas velocity
Provides large interfacial surface for mass transfer

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Mass Transfer
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is

More
Less
Same
Unpredictable

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Mass Transfer
Which of the following equipments is not used for gas dispersion?

Bubble cap tray towers
Perforated sieve tray towers
Agitated vessels
Spray towers

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Mass Transfer
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

200-300
> 500
43835
22190

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