Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Grid tray tower
Bubble cap tower
Wetted wall tower
Perforated tray tower

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
Driving force for the vapour flow is the pressure drop
None of these
Pressure increases gradually from bottom to the top of the column

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