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 pressure at the throat is equal to the critical pressure The flow is subsonic in the convergent section and becomes supersonic in the divergent section making statements C and D true Statement A is false as the pressure in the divergent section is lower than in the convergent section