Discussion
Statement I: Enlarging a hopper outlet is the most reliable cure for bridging.
Statement II: An arch across a smaller opening is easier for a cohesive material to sustain.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. A cohesive material forms an arch by bridging across the outlet, and the shorter the span the easier that arch is to sustain - the same reason a small arch in masonry carries load more readily than a large one.
Enlarging the outlet beyond the material's critical arching dimension therefore prevents the arch forming at all, which is why it is the most reliable cure. Vibrators, air cannons and rodding break arches after they form and are palliatives by comparison.
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