If the closed-loop transfer function of a control system is given as T(s)=$${{s - 5} \over {(s + 2)(s + 3)}},$$ then it is

The open-loop transfer function of a unity-gain feedback control system is given by $$G(s) = {K \over {(s + 1)(s + 2)}},$$ the gain margin of the system in dB is given by

In the system shown below, x(t)=(sin t). In steady-state, the response y(t) will be

Which one of the following polar diagrams corresponds to a lag network?