I am a first year B.Tech mechanical student at IIEST Shibpur. I will try providing some information about my department.
It is one of the best departments at IIEST. The faculty members are highly qualified, and their teaching methods are really good. They are actively engaged in research, and will happily encourage your research ideas on being approached.
The department performs decently well during placement season. Last year, 61 out of 75 B.Tech mechanical students were successfully placed. Companies like Tata Steel, CESC and Hyundai visit the department, and offer good packages to students.
IIEST has been known for its excellent teaching of core branches. Its EE and mechanical branches have one of the oldest and best labs in India. You can rest assured that the mechanical branch of this college is a pretty good one.