Card 33 / 41: Which of the following is the best explanation for why rocket engine nozzles are made of convergent-divergent sections? I. Flow does become supersonic in a purely convergent flow. II. The divergent section is important for controlling thrust direction. III. The combination reduces resonant disturbances to the mechanical structure of the nozzle. IV.. The symmetry of the device aids in analysis and manufacture.
A)
I and II only
B)
I and III only
C)
I only
D)
I, II, III, and IV
E)
III and IV only
Answer:
A) I and II only
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