Tamil Nadu Agricultural University

Yes, it is recognised by ICAR. Although, it is a semi-private college.

Yes, Energy Engineering is a growing sector in India. Hydro, Solar, Nuclear, Tidal are some if the energy sources which are preferred energy sources in various parts of India. Yes, its a good specialisation to pursue engineering.

Dear Gayu,
There is a lot of scope of central government jobs after completing B.Tech in biotechnology. You can apply in various biological as well as various medical research department included under The Government of India.You can work in the research and development departments of pharma/biotech