An aircraft with a turbojet engine flies at a velocity of 100 m/s. If the jet exhaust velocity is
300 m/s, the propulsive efficiency of the engine, assuming a negligible fuel-air ratio, is
(A) 0.33 (B) 0.50 (C) 0.67 (D) 0.80
Official Answer Key:
0.0
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2018 Q.32)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Air-Breathing & Rocket Propulsion** under *Propulsion* (1 Mark, NAT).
**2. Analytical Calculation**:
- Substituting aerodynamic parameters into governing Air-Breathing & Rocket Propulsion equation.
**3. Final Answer**:
Acceptable official numerical value is **0.0**.
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