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The pressure thrust term in the thrust equation arises when

  • A.The engine is at rest
  • B.The intake is choked
  • C.The nozzle exit pressure differs from ambient
  • D.The nozzle is convergent-divergent

Answer: C

It is the exit area multiplied by the difference between exit and ambient pressure, and it vanishes when the nozzle is perfectly expanded. A choked convergent nozzle always has a positive pressure term, which is part of why it remains useful despite not expanding fully.

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