With a rank of 30,000, there is a fair chance of you getting into NIT Rourkela, most probably in a dual degree or an integrated M Sc course. Whereas out of the top 10-15, you can get a chance of getting a seat in Biotechnology or textile or production is possible.
Also, if you have a category rank of 30,000, I'm not sure if you can expect anything. This rank can also fetch you a good branch in the Northeastern NITs or in the NIT in your home state which is not likely if you are from Telangana. And maybe Andhra Pradesh's new NIT too. So you can look for that.