Practice question

Stoichiometric air–fuel ratio for petrol combustion is approximately:

  1. 1 : 1 by mass always
  2. 50 : 1 by mass for all idle and full-throttle conditions identically
  3. 0 : 1 because petrol burns without air
  4. 14.7 : 1 by mass (about fourteen point seven parts air to one part fuel)

Answer: D — 14.7 : 1 by mass (about fourteen point seven parts air to one part fuel)

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