Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
In towers packed with stacked packing
In dumped packing of regular units
At very high liquid flow rate

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Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

The fraction vaporised but not the product composition
The product composition as well as the fraction vaporised
Neither the product composition nor the fraction vaporised
The product composition but not the fraction vaporised

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And humidified
At the same relative humidity
And dehumidified with decrease in wet bulb temperature
And dehumidified with increase in wet bulb temperature

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