A process that can be modeled as a time delay is controlled using a proportional feedback controller. The control valve and measurement device have negligible dynamics and steady-state gains of Kv = 0.5 and Km = 1, respectively. After a small set-point change is made, a sustained oscillation occurs, which has as period of 10 mm.
(a) What controller gain is being used?
(b) Now large is the time delay?