Discussion
Which change would NOT reduce the risk of bridging in a hopper?
Answer: D
Correct answer: Reducing the outlet size
Reducing the outlet makes bridging more likely, not less, since the critical arching dimension is exactly what the outlet must exceed. The other three all help: enlarging the outlet directly, steepening the walls to promote mass flow, and polishing them to reduce wall friction so material slides rather than keying against the surface.
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