Practice question

Why should an engine never be run for long in a closed, unventilated workshop?

  1. It wastes spark plugs
  2. Exhaust gas contains carbon monoxide, a poisonous gas that can cause unconsciousness or death
  3. It overcharges the battery
  4. It tightens the chain

Answer: B — Exhaust gas contains carbon monoxide, a poisonous gas that can cause unconsciousness or death

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