Bitmain interview questions

Basic question on mosfet, graduate school difficulty level and it is easy to guess and answer. But accident happen at the first interview, no one is coming, although another make up sesssion was made.

Went through three rounds of interviews. The process was quite strict but clunky on the technology side of things. Still their team was accomodating. I received positive feedback at the end of every round, but was ultimately ghosted. I felt like my interviewer was replying in a mechanical way, I am nout sure if he completely understood what I was saying since English was not his first language and his replies seemed rehearsed, as if he was reading off a script.