Discussion
Statement I: No dryer can take a product below the equilibrium moisture content for its exhaust air.
Statement II: At equilibrium the product neither gains nor loses moisture to the air.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second is the reason for the first. Equilibrium moisture content is by definition the value at which the product's vapour pressure matches that of the surrounding air, so no net transfer occurs in either direction.
It follows that the exhaust air condition sets a floor on how dry the product can become: once the product has reached equilibrium with that air, running the dryer longer accomplishes nothing. Drying further requires drier air - which in practice means heating it, since heating lowers the relative humidity and hence the equilibrium moisture.
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