If I complete Diploma in EEE, then I will only be eligible for B.Tech EEE, I can't join aeronautical. Am I right?

Dear Parveen, There is no rule as such. Regardless for your stream in diploma, you can choose any specializations in B.Tech. The admission in B.Tech is through LEET Exam for diploma holders. And there is nothing like; LEET pattern is different for different streams. Hence, you can choose any stream