A set of normally open auxiliary contacts attached to a lighting contactor is ___ when the coil is energized.

When a contactor coil is energized, it generates a magnetic field that pulls the contactor armature down, resulting in the movement of the associated contacts. In the case of normally open auxiliary contacts connected to a lighting contactor, these contacts are designed to be closed only when the contactor coil is energized. Therefore, when the coil is energized, the normally open contacts close, allowing current to flow through them.

This behavior is fundamental to the operation of contactors and auxiliary contacts in control circuits. The closing of the normally open auxiliary contacts allows them to perform a specific function, such as signaling, interlocking, or controlling additional circuits based on the state of the contactor. Hence, the response indicating that the contacts are closed when the coil is energized accurately reflects the operational characteristics of such electrical components.