i got 23000 rank in general ews ,m i eligible for nit?and for which one

You haven't mentioned the Home State you belong to. Nevertheless, going by previous years data, the chances of you securing a seat in various Colleges are as follows:

NIT Sikkim: ECE

NIT Manipur: CSE

NIT AP: ME

NIT Uttarakhand: EEE

Now this is based on 2019 data and cut offs change every year. Cut offs depend on various factors such as total no .of seats available, difficulty of the exam, previous year cut offs, no.of Candidates appearing for the exam and no.of Candidates applying for a course. Please use our College predictor for the complete list of Colleges that you may have a shot at: https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer