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Mass Transfer

Mass Transfer
When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

< 1
> 1
?
1

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Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Tray
Fluidised bed
Vacuum rotary
Spouted bed

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Mass Transfer
Flooding in a column results due to

High pressure drop
Low velocity of the liquid
Low pressure drop
High temperature

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

2.5 to 3
5
3 to 4
1.2 to 1.5

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Mass Transfer
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Higher than
Lower than
Same as
Either same or higher than

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P >>P
P < P
P
P = P

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