My brother is a student of NITIE and during his time at the institute, I got to know about the admission procedure there. NITIE does not differentiate between different branches of engineering. Even an instrumentation engineer has the same opportunity for getting admission as others.
However, multiple factors can affect your selection other than your engineering branch. There are different weights allocated for SSC marks, HSC marks, graduation, GATE/ CAT score, and GD-PI score, respectively. The sum of all these scores is used to evaluate candidates for the final selection.
Overall, NITIE encourages and maintains student diversity on its campus.