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A __________ is the only propulsion type whose thrust is independent of flight speed and altitude.

  • A.ramjet
  • B.turbofan
  • C.turboprop
  • D.rocket

Answer: D

It takes in no air at all, so there is no flight speed term in its thrust equation and no density dependence either. The cost is carrying the oxidiser, which limits endurance severely however large the thrust it can produce.

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