Mass Transfer
Batch tray dryers suffers from the disadvantage of

High maintenance cost
High labour cost & low heat economy
All of the listed here
Non-uniform & low production rate

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

None of the listed here
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
Hot water entering the tower and the cooled water leaving the tower

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