Which statement correctly describes the function of regulators in a circuit?

The statement about regulators that correctly describes their function in a circuit is that they should be zeroed out and locked out if circuits are tied. Regulators are designed to maintain a consistent voltage level within a circuit, but when circuits are tied or connected together, it can lead to unintended interactions that affect the performance of the equipment. Zeroing out ensures that the regulator is reset to a baseline state, which helps prevent any unstable or incorrect readings, while locking out helps to ensure that the settings are not inadvertently changed during maintenance or troubleshooting.

In contrast, consistently active regulators may not always be feasible because their operation can vary based on the circuit's needs. Regulators cannot merely be left in any position, as doing so can lead to incorrect voltage levels that could damage components. Additionally, while regulators generally have the capability to adjust based on circuit conditions, this automatic adjustment relies on proper configuration and is not an indication that they can be left unattended without a proper setup. Thus, the best practice for handling regulators in circuits, especially under complex conditions, is to zero them out and lock them out to maintain stability and safety.