10 Questions
In an open-loop control system, how is the output related to the reference input?
The output is not compared with the reference input. To each reference input, there corresponds a fixed operating condition.
What is the primary factor that determines the accuracy of an open-loop control system?
Calibration.
How does an open-loop control system perform in the presence of disturbances?
It will not perform the desired task.
Under what condition can open-loop control be used in practice?
Only if the relationship between the input and output is known.
Why are open-loop control systems not considered feedback control systems?
Because they do not use feedback from the output to adjust the control action.
Give an example of an open-loop control system that operates on a time basis.
Traffic control by means of signals operated on a time basis.
What is one advantage of open-loop control systems?
Simple construction and ease of maintenance, or less expensive than closed-loop systems, or no stability problem.
Under what condition would open-loop control be appropriate, according to the text?
When the output is hard to measure or measuring it precisely is economically not feasible.
What is a major disadvantage of open-loop control systems?
Disturbances and changes in calibration cause errors, and the output may be different from the desired one.
What periodic maintenance is required for open-loop control systems to maintain output quality?
Recalibration is necessary from time to time.
Test your knowledge on the different levels of automation in a factory as depicted in the Automation Pyramid. Learn about the Field, Control, Supervisory, Planning, and Management levels and their respective functions.
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