Discussion
Which component damps the movement of an automatic tensioner?
Answer: B
Friction or a hydraulic element inside the tensioner prevents the arm resonating with the engine's torsional pulses. A rubber pivot bush genuinely contributes damping in some designs, which makes the last option a real construction feature. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist.
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