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The working line on a compressor map is

  • A.The line of peak efficiency
  • B.The maximum speed line
  • C.Where the engine actually operates
  • D.The boundary of stable operation

Answer: C

It is where the matching conditions place the compressor at each power setting, not where the designer might wish it were. Its distance from the surge line is the surge margin, which must remain adequate through transients and deterioration.

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