The closed loop transfer function of a unity negative feedback system is 100/(s^2+8s+100). Its open loop transfer function is:(a) 100/s+8(b) 1/s^2+8s(c) 100/s^2-8s(d) 100/s^2+8sThis question was posed to me in unit test.My question is based upon State Variables and Linear Discrete-Time Systems in chapter State Variable Analysis and Design of Control Systems

The closed loop transfer function of a unity negative feedback system

1.	The closed loop transfer function of a unity negative feedback system is 100/(s^2+8s+100). Its open loop transfer function is:(a) 100/s+8(b) 1/s^2+8s(c) 100/s^2-8s(d) 100/s^2+8sThis question was posed to me in unit test.My question is based upon State Variables and Linear Discrete-Time Systems in chapter State Variable Analysis and Design of Control Systems
Answer» Right option is (d) 100/s^2+8s To explain I would SAY: For unity FEEDBACK system the closed loop transfer function is: G/1+GH and the open loop transfer function can be CALCULATED by balancing the VALUE of G.

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