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The position of the working line on a compressor map is governed chiefly by

  • A.The combustor pressure loss alone
  • B.The ambient temperature
  • C.The fuel used
  • D.The turbine nozzle and propelling nozzle areas

Answer: D

The choked turbine nozzle fixes the flow the compressor must deliver at a given pressure ratio. Adjusting that area by a few per cent moves the working line a long way, which makes it the standard remedy for an inadequate surge margin.

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