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The primary zone of a combustor is designed to operate at

  • A.A very rich mixture
  • B.Zero fuel
  • C.Approximately stoichiometric
  • D.A very lean mixture

Answer: C

Only near stoichiometric does the flame burn fast enough and hot enough to be self sustaining. The overall chamber is far leaner than this, which is why the air is deliberately divided between zones rather than admitted all at once.

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