Topic: Control Systems
The system with characteristic equation $s^4 + 3s^3 + 6s^2 + 9s + 12 = 0$
- A. Stable
- B. Unstable
- C. Marginally stable
- D. Marginally unstable
Answer: B. Unstable
Explanation: According to R-H array\nTwo sign change. So it has two poles in RHS.\nSo, system is unstable.