What is an example of continuous control?

Continuous control refers to a process where a variable is regulated or adjusted in a smooth and fluid manner rather than in discrete steps. Adjusting the flow rate in a pipeline is a prime example of continuous control. This process involves modulating the flow to meet desired setpoints in real-time, allowing for a gradual change rather than a sudden on/off action.

In systems implementing continuous control, feedback mechanisms often play a crucial role. For instance, if the flow rate is too high or too low, the control system will continuously adjust the control valve to maintain an optimal flow rate. This exemplifies the essence of continuous control, focusing on maintaining a variable within a desired range through constant adjustments.

Other options, while relevant to control systems, do not fit the definition of continuous control as precisely. Turning a device on and off is a form of discrete control, as it involves binary states rather than a continuous range. Scheduling periodic maintenance does not involve real-time adjustments or control of a process variable. Reading a sensor's output is vital for monitoring but doesn’t itself modify control in a continuous manner. Thus, adjusting the flow rate is the most accurate representation of continuous control.