Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Infinite trays and maximum reboiler heat load
Minimum trays and maximum reboiler heat load
Infinite trays and minimum reboiler heat load
Minimum trays and minimum reboiler heat load

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Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Reboiler load and condenser load are minimum
The top and bottom compositions correspond to the maximum enrichment available
Composition of vapors and that of liquid do not vary throughout the column
The top and bottom compositions are unchanged with and without total reflux

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Hot water entering the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
Cold water leaving the tower and the wet bulb temperature of the surrounding air
None of these

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