Which of the following statements is true about control relays?

Control relays are indeed primarily utilized for automation purposes, making this statement true. They play a crucial role in controlling various electrical circuits, allowing for the automation of processes in machinery and industrial equipment. By opening and closing circuits, control relays help manage the operation of devices like motors, lights, and other equipment based on specific input signals or conditions.

The automation aspect of control relays allows for the efficient operation of systems without requiring constant human intervention. This can increase productivity, improve reliability, and reduce the likelihood of errors in manual operation.

Other statements relate to the functionality and application of control relays. While some control relays can operate independently, they typically require a controlling signal, indicating that they are not completely standalone components. Control logic can sometimes be integrated into more complex relays, but many standard control relays do not contain this feature. Finally, while control panels often utilize relays for coordinating operations, they are not strictly required for the relay to function. The emphasis on automation purposes highlights the primary usage and significance of control relays in various industries.