Discussion
Which brush condition requires replacement?
Answer: C
Brushes are replaced when worn below the limit, chipped, or contaminated with oil, which prevents them conducting. A polished bedded face is exactly what a healthy brush looks like. Spring tension is checked at the same time. 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. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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