GATE AE 2012 • Q38 MCQ • 2 Marks

Propulsion

Air-Breathing & Rocket Propulsion

Subtopic: Engine Thermodynamic Cycles

Question Statement:

In a closed-circuit supersonic wind tunnel, the c onvergent-divergent (C-D) nozzle and test section are followed by a C-D diffuser to swallow the starting shock. Here, we should have the

Options:

  • (A) diffuser throat larger than the nozzle throat and the shock located just at the diffuser throat.
  • (B) diffuser throat larger than the nozzle throat and the shock located downstream of the diffuser throat.
  • (C) diffuser throat of the same size as the nozzle throat and the shock located just at the diffuser throat.
  • (D) diffuser throat of the same size as the nozzle throat and the shock located downstream of the diffuser throat. 2012 AEROSPACE ENGINEERING - AE AE 6/12

Official Answer Key:

A

Step-by-Step Solution & Explanation

### **Official Solution & Step-by-Step Derivation (GATE AE 2012 Q.38)** **1. Governing Concept & Syllabus Domain**: This question pertains to **Air-Breathing & Rocket Propulsion** under *Propulsion* (2 Marks, MCQ). **2. Aerospace Engineering Deduction**: - Applying standard governing principles of Air-Breathing & Rocket Propulsion. - Option **(A)** matches the analytical derivation and official criteria. **3. Final Answer**: Correct Option is **(A)**.

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