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

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

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Mass Transfer
Bollman extractor

Is used for extraction of oil from oilseed
Employs only counter-current extraction
Is a static bed leaching equipment
Is a centrifugal extractor

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