Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Partial pressure of water vapor
None of these
Wet bulb temperature
Relative humidity

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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,

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
Reboiler load and condenser load are minimum
The top and bottom compositions correspond to the maximum enrichment available

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