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Which terminal condition raises resistance and causes starting trouble?

  • A.A charged battery
  • B.A sulphated plate, which increases the internal resistance and therefore reduces the current available for cranking
  • C.Corrosion or a loose clamp
  • D.A high electrolyte level, which allows the acid to reach the terminal and therefore to conduct across the case

Answer: C

Corroded or loose terminals introduce resistance exactly where the current is greatest, producing slow cranking and heat. Sulphation genuinely raises internal resistance too, which makes the last option a real cause of the same symptom from inside the battery. 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. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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