Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Packed
Perforated tray
Bubble cap
Wetted wall

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Mass Transfer
Channelling is most severe

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

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