Open-loop control is best described by which statement?

• A. It relies on feedback to adjust output.
• B. It uses closed-loop sensors.
• C. It does not depend on feedback to control position.
• D. It can adapt to disturbances automatically.

Answer: (C)

Open-loop control applies a predefined input without using feedback to correct the output. It assumes the system will respond exactly as modeled, so the commanded action drives position to the target without checking actual results. Because there is no measurement to compare against, disturbances or model errors won’t be corrected automatically, making the approach sensitive to changes in the environment. That’s why the statement that it does not depend on feedback to control position is the best description. For example, a timer-based toaster runs for a fixed duration regardless of the toast’s actual doneness. Systems with feedback monitor the output and adjust accordingly, which is not the case here.