The open loop transfer functions with unity feedback are given below for different systems. Among these systems the unstable system is
A. G(s) =2/s+2
B. G(s) =2/s(s+2)
C. G(s) =2/(s+2)s^2
D. G(s) =2(s+1)/s(s+2)
Answer:C
The open loop transfer functions with unity feedback are given below for different systems. Among these systems the unstable system is
A. G(s) =2/s+2 B. G(s) =2/s(s+2) C. G(s) =2/(s+2)s^2 D. G(s) =2(s+1)/s(s+2)
Explanation: 1+2/s^2(s+2) =0. The coefficient of‘s’ is missing. Hence the system is unstable.