Hello Cp sai krishna,
MTech in nuclear Engineering is a professional degree of 2 years. The course involves the study of advanced learning in concepts such as uses of nuclear fission, fusion, construction, requirements design, design processing, management of nuclear reactors, and invention of nuclear materials.
Now to answer your question, Yes you can go for m.tech in nuclear engineering after b.tech in mechanical engineering. Just you need to qualify Gate entrance exam in nuclear engineering with valid score to pursue m.tech course.
For more information and update please follow the following link
https://www.careers360.com/courses/nuclear-engineering-course
https://engineering.careers360.com/colleges/list-of-me-mtech-in-nuclear-engineering-colleges-in-india
Hope this will help you a lot,
Thank you.
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