Question

Which one of the following statements is not true for a supersonic flow?

• A. Over a gradual expansion, entropy remains constant
• B. Over a sharp expansion corner, entropy increases
• C. Over a gradual compression, entropy remains constant
• D. Over a sharp compression corner, entropy increases

Hint:

Entropy increases across shock waves and non-isentropic expansions.

Answer 1

The Correct Option is A

In supersonic flow, even gradual expansions are not isentropic due to viscous effects; entropy generally increases.