Discussion
Statement I: Drying a product as fast as possible from the start is always desirable.
Statement II: Rapid surface drying can form an impermeable skin that traps moisture within.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. Drying as fast as possible from the start is often damaging, not desirable.
Statement II is correct and explains why: rapid surface drying can form an impermeable skin - case hardening - that traps moisture within the product, so drying appears complete while the centre is still wet and the product may spoil in store. In grain the same steep gradient produces internal stresses that fissure the kernel and cut head rice yield. The practical answer is gentler initial drying, or intermittent drying with tempering periods between passes.
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