C(s) 3. a) Find an equivalent closed-loop transfer function, R(s) for the system shown in Figure 3. Given block models are as follows: 6(s+2) 2 4 G, (s) G2(s) = G3 (s) = , H1 (s) = 1, H2(s) = -K %3D...

Extracted text: C(s) 3. a) Find an equivalent closed-loop transfer function, R(s) for the system shown in Figure 3. Given block models are as follows: 6(s+2) 2 4 G, (s) G2(s) = G3 (s) = , H1 (s) = 1, H2(s) = -K %3D s+8 s(s+1)' b) For this system, select a range of feedback gain, K that will make the system stable. (Use Routh-Hurwitz criterion) G,(s) C(s) R(s) G,(s) G,ls) H,(s) H,ls) Figure 3. Block diagram of the system.