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Which of the following is not a zone of the flame tube?

  • A.The dilution zone
  • B.The diffuser
  • C.The primary zone
  • D.The intermediate zone

Answer: B

Correct answer: The diffuser

The flame tube has three zones - primary, intermediate and dilution - each with its own air supply and its own job. The diffuser sits upstream of the flame tube altogether, slowing the compressor delivery air before it arrives, and is a separate component rather than a zone within the tube.

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