Thinking back to your last few jobs (if any), briefly tell me about your major duties and responsibilities.
This question helps give the interviewer insight into your technical interests, work-related skills, maturity, and verbal expression. The interviewer probably has your resume right in front of them, but they are asking you to give a brief and concise overview of your last few jobs, as well as get an idea of what you did at each job. This question may seem like it warrants a long explanation of each of your jobs, but it does not! Be brief and to the point.
"I was a contractor at XYZ company and went to different job sites to set up, test, and operate instrumentation and electronic devices. I was responsible for making sure all safety policies and procedures were followed while the work was being done. I worked alone at first and then was assigned a small team to supervise. I conducted daily safety tailgate meetings and was responsible for signing off on work orders for several sites. I stayed in constant radio contact with my team and helped guide them through troubleshooting situations."