A single-tank process has been operating with an inlet flow rate equal to29.4 m3 min-1. The operator increases the flow rate suddenly by 10%,resulting in a level change in the

tank as recorded in Table Q3. Assuming that the liquid-level dynamics follow a first-order model, determine: (a) The Pl controller settings using the Ziegler-Nichols tuning relations. (b) The process gain and time constant using Sundaresan and Krishnaswamy's method. Compare these values against the values from the graphical method.