Question

Consider the following statements about the flow in a convergent-divergent nozzle operating under design conditions:

1. In the divergent section, pressure is higher than the pressure in the convergent section.
2. The pressure at the throat is equal to critical pressure.
3. The pressure in the convergent section reduces.
4. The flow is subsonic in the convergent section and supersonic in the divergent section.

Choose the correct answer from the options given below.

• A. (A), (B) and (C) only.
• B. (B), (C) and (D) only.
• C. (A), (B), (C) and (D).
• D. (A), (C) and (D) only.

Hint:

In a convergent-divergent nozzle the flow changes from subsonic to supersonic and the pressure at the throat is critical

Answer 1

The Correct Option is B

In a convergent-divergent nozzle, the throat pressure matches the critical pressure. The flow is subsonic in the convergent section and transitions to supersonic in the divergent section, thereby validating statements C and D. Statement A is incorrect because the pressure within the divergent section is lower than in the convergent section.