Question Bank for Process Control

  1. What are the challenges in controlling processes with large time delay ?
  2. How do Smith predictors help in this regard ?
  3. Explain the working of pneumatic nozzle-flapper amplifier with a diagram.
  4. Explain the Zeigler-Nichols method to tune P, PI and PID controllers for stable processes in a unity feedback configuration.
  5. With suitable diagram, explain inferential control scheme.
  6. Derive the transfer function of two tanks in series whose liquid levels interact.
  7. How can feed-forward and feedback control schemes be combined ? Discuss the merits of the same.
  8. How does the ON-OFF control scheme works ? Give some of its applications.