Anna University
Nit Calicut

Kerala , has a very few industries . So, if you want to really work in Kerala., Then check for ranking of the local colleges (again your preference) and choose one. Our government has released a ranking sheet for all the colleges in India.

Thanks for your question.
If you are interested in doing something out of the box, I would recommend you aeronautical or aerospace engineering. In future years could join ISRO by that way.
Mechanical engineering is a broad stream as it is combination of various branches like production, automobile, etc. So, in between automobile and mechanical engg, I would strongly recommend you mechanical engg, as it broadens your future career opportunities. You can do specialization in many fields post your degree, like robotics, marine, aerospace, aeronautical, automobile if and only if you graduate with mechanical engg background.
Best Luck!

Dear Biju
It's really good for your idea but if you're native of Kerala I want you to choose different verticals of the world to go and work there because you need to know what the outer world is. If you really want to work in Kerala, then go for automobile/mechanical. You'll be having good future there.
All the best, but take wise decision.