I have some friends from the Mechanical branch at NIT Raipur. According to them, the faculty for mechanical engineering in NIT Raipur is very talented and experienced in their field. Although the best faculty is a completely subjective view and depends on the perception of individuals, here are some of the faculty that my friends look up to.
There are also others, who are not mentioned in the list. You can check out the departmental page of the Mechanical Engineering branch on the official website of NIT Raipur to get a detailed view of the faculty profiles. Hope this helps.