In UG Level, There is no ECE at IIT Delhi. You have Electrical and Electrical (Power) besides your first preference CSE at IIT Delhi. Assuming youre from General Category you must target atleast AIR 100, to secure a Place at CSE in IIT Delhi. Of course you have relaxations icase youre from Certain Categories.

For more information and IIT Delhi Cutoff do follow the link below

https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-delhi/amp