Question Statement:
The critical Mach number of an airfoil is attained when
Options:
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(A) the freestream Mach number is sonic.
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(B) the freestream Mach number is supersonic.
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(C) the Mach number somewhere on the airfoil is unity.
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(D) the Mach number everywhere on the airfoil is supersonic.
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2012 Q.6)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Verbal & Numerical Aptitude** under *General Aptitude* (2 Marks, MCQ).
**2. Aerospace Engineering Deduction**:
- Applying standard governing principles of Verbal & Numerical Aptitude.
- Option **(A)** matches the analytical derivation and official criteria.
**3. Final Answer**:
Correct Option is **(A)**.
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