L.1 - Intro & Symbology

Question 1

Why are process control systems used?

Answer 1

1) to automate boring, repetitive tasks
2) to improve product consistency and quality
3) to maintain safe conditions for equipment and personnel
4) to decrease production costs by optimizing machine operation
5) to reduce energy and raw material consumption

Question 2

What are the two types of control systems?

Answer 2

1) Open-loop
2) Closed-loop

Question 3

What are open-loop control systems?

Answer 3

they have no negative feedback (feedback from output to input)

Question 4

What is a disadvantage for open-loop systems?

Answer 4

it requires operator intervention if processed temp. is not at required (setpoint)

Question 5

What are closed-loop control systems?

Answer 5

systems that have negative feedback path (from output to input)

Question 6

What does a typ. closed-loop control system look like?

Answer 6

Input (Setpoint) - Controller - FCE - Process - Output
I I
- Measurement -