A control process that involves maintaining a desired set point and requires some feedback is called:

• A. Automatic control process
• B. Sequential control process
• C. Combination control process
• D. Interlox control process

Answer: (A)

Focus here is feedback-based regulation. When a process is kept at a desired value and adjustments are made based on measurements from sensors, you’re looking at automatic control. The controller continuously compares the actual process variable to the set point and changes the input (like a valve position or heater power) to minimize the difference. This automatic, sensor-driven correction is what defines an automatic control (often implemented with a PID controller in PLC systems).

The other ideas describe different kinds of control that don’t center on maintaining a set point with feedback. Sequential control is about executing a specific order of steps, not continuously correcting a variable to stay at a target value. The remaining terms aren’t standard in this context, so they don’t fit the scenario described.