Discussion
Arrange the causal chain by which a damp crop stops a hopper:
1. Moisture content rises in the material
2. Cohesion between particles increases
3. An arch forms across the outlet
4. Flow stops and the hopper must be rodded or vibrated
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4
The chain begins with moisture content rising in the material (1), which increases the cohesion between particles as liquid bridges form at their contact points (2).
A cohesive material can support an arch across the outlet (3), and once that arch is stable the flow stops and the hopper must be rodded or vibrated to clear it (4). The permanent cure is an outlet larger than the material's critical arching dimension, since the arch then cannot form at all.
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