A launch vehicle has a main rocket engine with two identical strap-on motors, all of which fire
simultaneously during the operation. The main engine delivers a thrust of 6300 kN with a specific
impulse of 428 s. Each strap-on motor delivers a thrust of 12000 kN with specific impulse of 292 s.
The acceleration due to gravity is 9.81 m/s 2. The effective (combined) specific impulse of the
vehicle is _______ s.
Official Answer Key:
0.0
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2016 Q.46)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Air-Breathing & Rocket Propulsion** under *Propulsion* (2 Marks, NAT).
**2. Analytical Calculation**:
- Substituting aerodynamic parameters into governing Air-Breathing & Rocket Propulsion equation.
**3. Final Answer**:
Acceptable official numerical value is **0.0**.
Practice This in Real CBT Exam Interface
Test yourself with the official TCS-iON palette, virtual calculator, and immediate performance analytics.