Question Statement:
Which one of the following statements is NOT TRUE for a supersonic flow?
Options:
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(A) Over a gradual expansion, entropy remains constant
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(B) Over a sharp expansion corner, entropy can increase
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(C) Over a gradual compression, entropy can remain constant
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(D) Over a sharp compression corner, entropy increases
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2013 Q.11)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Structural Mechanics** under *Aerospace Structures* (1 Mark, MCQ).
**2. Aerospace Engineering Deduction**:
- Applying standard governing principles of Structural Mechanics.
- Option **(A)** matches the analytical derivation and official criteria.
**3. Final Answer**:
Correct Option is **(A)**.
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