The open loop transfer function of a unity gain negative feedback control system is given by G(s) = K/((s + 3)*(s + 7)). What is the value of K for which the system damping ratio is 1.0?
- A. 4
- B. 7
- C. 3
- D. 5
Answer: A. 4
Explanation: Applying Routh-Hurwitz stability criterion or root calculation to the unity feedback open-loop transfer function yields 4.