Electronics and Communication Engineering

Yes, you have a chance to get admission in NIT Durgapur.
Select the branch in which you love to work and you have very much interest in it with curiosity. Don't follow craze and popularity. Trust me, by choosing your interested field would be best for you than any other fields.

If you booked the seat for any college, then you cannot change the branch or if you did not book the seat, then you can edit or change the branch for counselling in JEE.

Hello,
These are a few colleges for ECE in Bangalore:
1.Bangalore Institute of Technology
KR Road, V V Puram, Bengaluru, Karnataka 560004
2.Ramaiah Institute of Technology
MSR College Road, MSR Nagar, Bengaluru, Karnataka 560054
3.BMS College of Engineering
Bull Temple Rd, Basavanagudi, Bengaluru, Karnataka 560019
4.MVJ College Of Engineering
Channasandra Main Road,Near ITPB, Whitefield,Kadugodi, Bengaluru, Karnataka 560067
5.Dayananda Sagar College of Engineering
Shavige Malleshwara Hills, Kumaraswamy Layout, Bengaluru, Karnataka 560078
6.R. V. College of Engineering
Mysuru Road, R. V. Vidyanikethan Post, Bengaluru, Karnataka 560059

Selection of the subjects depends on your interest in which area you wish to do you research and make a career. PhD duration is 5-6 years.
The exact length depends on how much time you must spend on your courses, exams, etc.