How good is Heritage Institute of technology in mechanical department?

It's distinctly average. When it comes to placement in core branches (civil, mechanical, and electrical), the majority of its students are placed in IT companies, with only a few placed in core companies. It's not because of the college, but because of the caliber of the students. To get a job in a core company, you have to work extremely hard from the first day of college. You must be well-versed in your subjects. You won't find all of the faculties beneficial, though some of them are. However, regardless of the circumstances, you must comprehend all concepts and apply them in real life with the assistance of a teacher or on your own. Every year, many core companies visit campus and offer higher salaries than IT companies.

So you must study in order to pass their interviews. To advance in your career, you must pass exams such as GATE or IES. And keep in mind that this is the case in almost every college in India. Heritage is no exception.