Discussion
Which fault produces a chirp once per belt revolution?
Answer: D
A noise synchronised with belt rotation points to the belt itself or to something it contacts once per turn. Tensioner damping failure genuinely produces belt oscillation and noise, which makes the last option a real alternative. The shared behaviour explains why these belong together and the differences explain why both exist. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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