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

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

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Mass Transfer
Flash distillation is

Same as simple distillation
Most useful for handling binary systems
Same as differential distillation
Used for multicomponent systems like crude refining

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