Discussion
Match each drying problem in List I with its remedy in List II.
List I
A. Case hardening
B. Wide moisture spread in a deep bed
C. Fissured rice kernels
D. Low drying efficiency
List II
1. Recirculate the grain between passes
2. Start gently and raise the temperature later
3. Recirculate part of the exhaust air
4. Temper between drying passes
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each problem is matched to the remedy that addresses its cause. Case hardening (A) is caused by too rapid initial surface drying, so the answer is to start gently and raise the temperature later (2). A wide moisture spread in a deep bed (B) comes from air being spent as it rises, so recirculating the grain between passes (1) evens out the exposure.
Fissured rice kernels (C) come from steep internal gradients, so tempering between passes (4) lets them relax. Low drying efficiency (D) is dominated by sensible heat lost in the exhaust, so recirculating part of the exhaust air (3) recovers it.
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