Mass Transfer
Which of the following equipments is not used for gas dispersion?

Perforated sieve tray towers
Agitated vessels
Spray towers
Bubble cap tray towers

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

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