Both core technical and non-core companies visit IITK campus.

Many core recruiters offer between 12 lpa and 16 lpa and this is the average salary bracket. Most companies come for recruitment like Microsoft, Facebook, Google. Some companies like Oracle offer different salaries depending on the experience/knowledge of the students. It can vary from 6.5 lpa to 9 lpa on an average as well. It also depends upon the college you get placed in.

Good luck!