Discussion
Assertion (A): A converging nozzle cannot produce a supersonic exit however low the back pressure is taken.
Reason (R): A transition through Mach one can occur only where the duct area is stationary.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second explains the first. The area-velocity relation permits sonic conditions only at a throat, and a purely converging duct has its minimum area at the exit. The best it can do is choke with Mach one at the exit plane; going further requires a divergent section.
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