Data Center Certified Associate (DCCA) Practice Exam

In an open control loop, the control action is performed without measuring or using the output to adjust the input. There’s no feedback path from what the system output becomes back to the controlled variable, so the system runs purely on the input signal and the assumed system behavior. That’s why the statement is true: there is no feedback from the output to the controlled variable. Without feedback, the system can’t automatically correct for disturbances or model mismatches, so the actual output may diverge from what was intended. The other ideas don’t fit open-loop behavior: there isn’t full feedback, so the output isn’t constantly compared and corrected. The output and the controlled variable aren’t guaranteed to be identical, since disturbances and dynamics can create differences. And while the input (the variable you set) influences the output, open-loop control doesn’t imply the variable directly “controls” the output in a feedback sense—the system simply follows the input without verifying the result.