If you are a rank holder in any of the entrance examinations and your family income is less that Rs. 4.5 lakhs per year , you become automatically eligible for SNQ quota. Of course, the number of eligible candidate per candidate is limited to 5 percent of the total available seats.

For detailed information you may visit https://www.aicte-india.org/downloads/Instructions%20to%20candidates.pdf

Hope it would help.