Discussion
Statement I: A choked convergent nozzle always carries a positive pressure thrust term.
Statement II: Its exit pressure remains above ambient because expansion is incomplete.
In the light of the above statements, choose the correct answer.
Answer: D
Both hold and the second is the reason. That term partly compensates for the velocity the nozzle failed to produce, which is why a simple convergent nozzle remains acceptable on many engines despite being under-expanded.
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