Congratulations on the rank secured by your son. We know he performed his level-best, but unfortunately, his rank will probably not be good enough to get a seat in either Civil or Electrical engineering disciplines in NSUT, Delhi (judging from previous years' cut-offs). But NSUT offers other disciplines that he is surely eligible of with his rank. Please find attached the detailed cut-offs for all streams for NSUT, Delhi, here:

https://www.careers360.com/university/netaji-subhas-university-of-technology-new-delhi/cut-off

To answer your second question- Drafting a comparison between Civil and Electrical disciplines would not be legitimate. Both of them are core engineering courses and have wide scopes in future if pursued in a dedicated manner. However, in my (an electrical engineering student's) opinion, Electrical engineering has slightly better job opportunities in India compared to Civil. Wishing you luck, thank you. :)