Discussion
Assertion (A): A hopper that bridges should first be fitted with a vibrator.
Reason (R): Outlet size is the governing variable in every arching criterion.
Select the correct answer from the options below.
Answer: D
Correct answer: A is false but R is true
The reason is true and it condemns the assertion. Since outlet size governs every arching criterion, the reliable cure is to enlarge the outlet beyond the critical dimension, after which no arch can support itself. A vibrator treats the symptom, and often makes matters worse by compacting the material further into the arch.
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