Open-loop motor control is characterized by which of the following?

• A. No feedback
• B. Constant feedback
• C. Self-diagnostic
• D. Adaptive control

Answer: (A)

Open-loop motor control relies on a pre-planned command and executes it without using sensory feedback to guide or correct the action as it happens. Because there is no feedback during the movement, any errors or disturbances (like friction, load variations, or misalignment) aren’t detected or corrected in real time, so the final result can deviate from the intended outcome.

This is why the best description is no feedback. Continuous feedback would mean monitoring outputs and adjusting the command in real time (closed-loop). Self-diagnostic implies monitoring internal states for faults during operation, which still involves feedback information. Adaptive control involves changing the control strategy based on results, which also relies on feedback. An example of open-loop behavior is a pre-programmed, fixed motor move performed without sensing its actual position or outcome during the move.