Lesson 7 - Process Control Mechanisms SAQ
This lesson allows you to test yourself on the material covered in the Process Control Mechanisms lesson and determine the level to which you have met the learning outcomes.
Self-Assessment Questions
1. * What is the difference between cascade control and ratio control?
2. ** What are the components of a control loop? Draw a diagram and explain each component. Translate this into a level control loop for a tank.
3. ** Compare self-acting control, discrete control, and continuous control. What are the advantages and disadvantages of each? For each one, say where in the brewery you would use it.
4. ** Consider the following figure showing a pressure control loop:
a) Is this an open or closed loop system?
b) Is the controller direct acting or reverse acting?
c) What are the issues with the PID loop and how would you improve it?
5. ** What are the three components of a PID controller? How do they work and what are their limitations?