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Which condition makes a cracked cap misfire worse?

  • A.Hot weather, in which the moulding expands and therefore opens the crack further than it is when it is cold
  • B.High speed
  • C.Heavy load, at which the higher cylinder pressure demands a greater voltage and therefore encourages tracking
  • D.Damp weather

Answer: D

Moisture bridges the crack and the spark takes the easier path. Heavy load genuinely makes tracking more likely because the plug demands more voltage, which makes the last option a real aggravating factor. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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