Discussion
Which of the following does not describe a choked nozzle?
Mass flow increases as back pressure falls
Sonic conditions at the throat
Mass flow fixed regardless of downstream pressure
Pressure ratio at or above critical
Answer: B
Correct answer: Mass flow increases as back pressure falls
This is what a choked nozzle does not do. Once the throat is sonic, information cannot travel upstream against the flow, so lowering the downstream pressure has no effect on the mass flow, which is fixed by the upstream stagnation conditions and the throat area. The other three all describe choking correctly: sonic conditions at the throat, a pressure ratio at or above critical, and mass flow independent of what happens downstream.
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