Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

None of these
Rate of drying decreases abruptly
Surface evaporation of unbound moisture occurs
Cracks develop on the surface of the solid

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Mass Transfer
Plate efficiency

Increases due to foaming
Increases due to weeping and dumping of liquid
Increases due to liquid entrainment
Is a function of the mass transfer between liquid and vapour

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