Describe a time when you made a technical mistake that illustrated your need for improvement in some area of your craft.
Technical judgment is a key aspect of any technician's job. How you react to past mistakes and how you take that into future work says a lot about you as an employee. It's ok to admit a technical mistake, but be sure to discuss how you solved it and how you took that knowledge into similar future jobs.
"As an apprentice, I made my fair share of technical mistakes. However, that's one of the reasons why I worked with a skilled technician, so that I could learn and grow in my craft. One time I was working on a circuit, and I thought I had connected everything properly. As an apprentice, you want to be confident in your work, but you always want a more skilled technician to check your work. He quickly realized I had tangled several wires which meant they were also connected to the wrong part of the breaker. Now, I always go back and follow every line to make sure the connections are correct."