I have got 2746 rank in jee mains,2018I am from North india ,so what shall I prefer for cs NIT warangal,surathkal or IIIT delhi??

For Computer Science engineering best is NIT Warangal in terms of Faculty and Placements. NIT Surathkal is also great but top choice you should make is NIT Warangal.
CS at NITs is better than that of IIITD and if you are good at coding, you'll get better opportunities in NITs.
Also, if you get a choice prefer IIIT-Hyderabad over all NITs