The expected answers were:
(a) An open loop control system is one in which the control actions is independent of the output while a closed loop control system is one in which the control action is somehow dependent on the output.
Classification:
Open loop |
Closed loop |
Operating a toggle switch |
Traffic light controller |
Traffic light controller |
Bread toaster |
|
Bicycle-riding process |
(i) Positive feedback
(ii) Feedback factor with magnitude of unity (1)
(iii) Feedback factor with a phase of 1800
The question was on Control Circuits. The question was unpopular. The performance of the very few candidates that attempted it was reportedly poor.