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A diesel engine emits more particulate than a petrol engine principally because

  • A.Diesel fuel contains more sulphur
  • B.The compression ratio is higher
  • C.It runs at a lower temperature
  • D.Combustion occurs in a heterogeneous spray with locally rich zones

Answer: D

Fuel burns as it is injected into hot air, so there are always regions richer than stoichiometric where soot forms. Later injection strategies and higher injection pressures both aim to shorten the time such regions persist.

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