Discussion
The first stage turbine nozzle guide vanes act as the flow control of the engine because
Answer: A
Correct answer: They are choked, fixing the corrected flow
At almost every operating condition the first stage nozzle guide vanes run choked, so the corrected flow through them is set by their throat area alone and cannot change with what happens downstream. The compressor must therefore deliver exactly that flow at each pressure ratio, which is what fixes the working line. It is a fixed geometry doing the controlling, not a variable one.
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