Hello Mohan, 

NIT DELHI provides 100% tuition fee waives for SC/ST/PH students. The only fee you need to pay is the hostel and the mess fee. The mess plus hostel fee will be around 20500 rupees.

I hope you will find my answer helpful. 

All the best. 

Dear candidate,

The fee structure is different for different economical groups . You can have a look at them on the official site

https://nitdelhi.ac.in/?page_id=13358

Hope I answer your question and it's helpful.

All the best!

Dear Aspirant,

The fee structure of Delhi NIT is similar for both SC and those who have a family income less than 1 lac. I am providing you the link where you can see the detailed structure.

Link: https://nitdelhi.ac.in/wp-content/uploads/2019/06/B_TECH_2019_2020_BELOW_1_LAC.pdf

Good luck