Mass Transfer
Batch tray dryers suffers from the disadvantage of

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

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Mass Transfer
Heat load in a cooling tower

Both A & B
Is equal to the number of kg, of water circulated times the cooling range
Neither A nor B
Means the amount of heat thrown away (KCal/hr.) by the cooling tower

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