Is there any exemption in B.Tech after completing diploma in electrical engineering?

Of course, you will get direct admission to second year BTech. Ist year is excepted for Diploma students. Your study Period of BTech will only 3 Years.

No Not really, AICTE considers diploma as equivalent to first year of engineering degree. Candidates having studied diploma can switch to any stream of engineering. . For admission, you need to have secured a minimum of 60% marks in diploma.