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

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

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Decreases pressure drop, decreases surface area
Decreases pressure drop, increases surface area
Increases pressure drop, increases surface area
Increases pressure drop, decreases surface area

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Mass Transfer
A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

The mixture exhibits an azeotrope at 101.3 kPa
The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10
The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
The mixture contain optical isomers

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