Discussion
Statement I: The angle of repose rises as grain moisture content increases.
Statement II: Moisture increases the cohesion between adjacent kernels.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both statements are true and the second accounts for the first. Surface moisture forms liquid bridges between adjacent kernels, and the surface tension in those bridges resists relative sliding.
A heap of the more cohesive material stands at a steeper slope before it collapses, so the measured angle of repose rises - dry cereal near 30 degrees may reach the high thirties when damp. The same mechanism raises the coefficient of friction against bin walls and is the direct cause of bridging in hoppers, so the effect is felt in handling equipment long before it is measured in a test.
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