Closed Loop Control Part A

Question 1

In a P-only controller, what 2 factors make up the dynamic gain?

Answer 1

1) Proportional gain of the controller
2) Dynamic gain of the process

Question 2

What 3 responses can a feedback control loop in automatic have?

Answer 2

1) Sustained oscillations
2) Unstable response
3) Stable response

Question 3

What 2 conditions are present when sustained oscillations?

Answer 3

1) Dynamic gain of the control loop is 1
2) 180 degree phase shift

Question 4

What 2 conditions are present when the loop shows a stable response?

Answer 4

1) Dynamic gain is less than 1
2) 180 degree phase shift

Question 5

What 2 conditions are present when the loop shows an unstable response?

Answer 5

1) Dynamic gain is greater than 1
2) 180 degree phase shift