Micron Technology Test Engineer interview questions

I am doing my B. E in ECE in Madras institute of technology in Chennai. I applied through on campus. First we had an online test which contains aptitude, digital and some C programming questions. After that screening I was called for interview (It also happened in our college campus).only one interview with some simply questions. My interviewer was very friendly. It was more like a conversation than an interview. He asked me to ask any question. I asked what does test engineer do? He made me answer that question by asking me some questions. He also asked me about the online test about its difficulty such as "which question I felt challenging"