Elbit Systems FPGA interview questions

During the interview, the first question was about introducing myself. Then, the interviewer drew a delta signal on a piece of paper and asked me how I could shift the signal to a different position on the axis. They also asked if there was another way to do it. After that, I was asked to draw the DFT of the signal. Next, the interviewer asked me what I would do in Python to see the signal in the middle of the axis. Finally, the interviewer asked me to identify what the signal on the left side of the x-axis was.