for admission to BE/B. Tech courses in  NSIT, DTU and IGDTUW will be done on the basis of All India Rank (AIR) in JEE Main 2019 Paper-1. For Sc category there is minimum 10% marks relaxation at DTU and at NSIT just pass in Physics, Chemistry and Mathematics. For detailed information please go through the link below -

https://engineering.careers360.com/articles/jac-delhi-eligibility-criteria

DTU & NSIT takes the admission through JAC Delhi Counselling on the basis of JEE Main score. In total seats of the colleges, 85% seats are reserved for Delhi Candidates, Remaining 15% seats are there for the outside Delhi candidates. The cutoff varies every year depending on the various factor like branches, Delhi Quota/ other state quota etc. So it would be tough to tell you the exact, As per previous year cutoff the maximum closing rank was around 27510 as SC category out side Delhi state Quota for Computer Science. You can check the other branches cutoff rank with the given below link.

https://www.careers360.com/university/delhi-technological-university-delhi/cut-off?cid=97&college_id=3173&exam_id=113655&category=1378

Good Luck!