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Which of the following is not a zone of a conventional combustor?

Diffusion zone

Primary zone

Intermediate zone

Dilution zone

  • A.Diffusion zone
  • B.Primary zone
  • C.Intermediate zone
  • D.Dilution zone

Answer: A

Correct answer: Diffusion zone

The three zones of the flame tube are primary, intermediate and dilution. The diffuser is a separate component upstream, between the compressor and the flame tube, whose job is to slow the air before it enters. It is not a zone of the flame tube, though the similarity of the words makes it a plausible distractor.

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