Based on my experience in automation it's very important to know at least basics of pneumatic, mechanical and software logic behind the process in order to solve the issue efficiently and confidently. (etc.)
Reference to a previous project. Description of intervention, techniques to adjust project direction and outcomes. All of which can be summarised as ' spotting a problem, stopping it , making sure the right thing was done'! Project management is about spotting the obvious before others do, and changing what happens next.