Consider the system shown in Fig. 3.68.
(a) Compute the closed-loop characteristic equation.
(b) For what values of (T,A) is the system stable? Hint: An approximate answer may be found using
![452_07c24a70-54ed-4e9d-8b26-28dbcad0e0a8.png](https://secure.tutorsglobe.com/CMSImages/452_07c24a70-54ed-4e9d-8b26-28dbcad0e0a8.png)
![107_a936608d-03fb-4e86-8942-84a0f151f7ec.png](https://secure.tutorsglobe.com/CMSImages/107_a936608d-03fb-4e86-8942-84a0f151f7ec.png)
Figure 3.68 Control system for Problem 3.47 or
For the pure delay .As an alternative, you could use the computer MATLAB (SIMULINK®) to simulate the system or to find the roots of the system's characteristic equation for various values of T and A.