Discussion
In a converging-diverging nozzle with a back pressure between the design value and the fully subsonic case, a normal shock
Answer: D
For back pressures in this range the flow accelerates supersonically past the throat and then must be brought back to match the higher exit pressure. A normal shock forms in the divergent section, and it sits further downstream the lower the back pressure, until at the design condition it leaves the exit altogether.
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