For the process represented in the block diagram a) Sketch the open loop step response in y(t) to a set point step change of magnitude 2 in ysp. Is the process open loop stable? b) Write the transfer function for the closed loop system when GC is a proportional only controller c) Can the process be unstable in a closed loop system, and if so, why? d) Using a P-controller only, find the proportional gain which gives stable oscillations on a closed loop time response. Activate Wi Go to Settings Ysp(s) Ge == Kp-e (p+1)(p25+1) Figure 2. Second order process with dead time (Kp = 1.5, Tp1 = 5, Tp2 = 3 and t = 2). y(s)