Analyze the following industrial processes from process control viewpoint by identifying the (i) control objective, (ii) control, manipulated, and disturbance variables, (iii) operating characteristics (i.e. whether it is batch, semibatch or continuous process), (iv) control structure (i.e. feedback and feedforward control). Draw the FB & FF control schemes for each process separately.

Etching gases Electrode Nutrient Wood chips Plasma Coolant in Products Coolant out Products N Products Steam NaOH Products Spent gases Wafer (e) Jacketed batch reactor (f) Fed-batch bioreactor (g) Wood chip digester (h) Plasma etcher