Which of the following methods is the strongest tool to determine the stability and the transient response of the system?
- A. Routh-Hurwitz criterion
- B. Bode plot
- C. Nyquist plot
- D. Root locus
Answer: D. Root locus
Explanation: Root locus traces the exact trajectories of closed-loop poles in the s-plane as gain varies, providing complete information on both absolute/relative stability and transient response (damping ratio, natural frequency).