Discussion
Statement I: A convergent-divergent nozzle is unhelpful below the critical pressure ratio.
Statement II: Below that ratio the divergent section acts as a diffuser and slows the flow.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. A divergent passage accelerates supersonic flow but decelerates subsonic flow. Below the critical pressure ratio the throat never reaches sonic conditions, so the flow entering the divergent section is subsonic and that section acts as a diffuser, converting velocity back into pressure and reducing the thrust. The convergent-divergent form pays only where the pressure ratio is well above critical.
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