Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

Decreases
May increase or decrease ; depends on individual design
Remains same
Increases

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Helps in increasing the bubble size entering the settler
Helps in increasing the settling rate of the bubbles
Comprises of thin bed of substances of extended surface having high porosity

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