Question

Consider a negative feedback system where G(s) =1/(s+1) and H(s) =K/s(s+2). The closed loop system is stable for

(a) K>6

(b) 0<K<2

(c) 8<K<14

(d) 0<K<6

I got this question during an online exam.

I'd like to ask this question from Relative Stability Analysis topic in section Stability and Algebraic Criteria of Control Systems

Answer 1

Right option is (d) 0<K<6

For explanation: Using Routh array, for stability k<6.