Discussion
A designer claims a converging nozzle will reach Mach 1.5 at its exit given a low enough back pressure. The claim is
Answer: C
Sonic conditions can be reached only where the area is stationary, and in a purely converging duct the minimum area is the exit plane. The nozzle therefore chokes with Mach one at the exit and goes no further, whatever the back pressure. A divergent section is required to continue accelerating the flow.
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