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Which of the following delivers most of its output as shaft power?

Turboprop

Turbojet

Ramjet

Scramjet

  • A.Ramjet
  • B.Scramjet
  • C.Turboprop
  • D.Turbojet

Answer: C

The other three deliver essentially all of their output as jet momentum from the nozzle. A turboprop extracts nearly all the available energy to the shaft, leaving only a small residual jet thrust that is usually counted as a bonus.

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