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A fully expanded nozzle is one where

  • A.Exit pressure equals ambient
  • B.The exit velocity is sonic
  • C.The nozzle is convergent only
  • D.The exit area equals the throat area

Answer: A

All the available pressure energy has been converted into exit velocity, which gives the maximum thrust for the given conditions. A fixed nozzle achieves this at only one flight condition, so variable geometry exists to hold it over a range.

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