I have done my Diploma in electrical engineering. Is it possible for me to pursue B.Tech via distance from Guwahati?

B.Tech through distance is not a luxury any more. The supreme course has ordered against it and AICTE doesn't recognise such courses. Hence, not possible.

Evening/distance/online/part time engineering courses are not valid any more as per the latest supreme court verdict. Hence, I would recommend you to join regular B.Tech course for better career prospects. http://www.tribuneindia.com/news/nation/no-technical-education-through-correspondence-says-su