Short intro of self, short intro to the role. Asked a series of questions about a specific circuit specifically an AC to DC rectifier, some microcontroller questions about monitoring incoming voltages, microcontrollers driving bjts, flyback resistors for motors. failure modes of the system. Then I was given a device with the cover off and asked to talk about what I saw, hot side, cold side etc. I was then walked through the factory and other facilities, some questions here and there about my experience. I suggest going in with UL knowledge, maybe emi and wireless devices and failure mode analysis, as well as basic ac to DC circuit knowledge. There were a lot of questions but not especially hard