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Which factor raises the voltage required to fire a plug?

  • A.A worn electrode with rounded edges, which spreads the field and therefore requires a greater potential to break down
  • B.A wider gap and higher cylinder pressure
  • C.A richer mixture, which conducts less readily and therefore demands a higher voltage across the electrodes
  • D.A hotter plug

Answer: B

Gap width and cylinder pressure are the principal factors, and both rise as a plug wears. Rounded electrodes genuinely do raise the required voltage, which makes the last option a real contributing factor rather than a distractor. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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