My friend attended it and got selected. The seems to have a written test (aptitude, verbal, etc), GD and technical HR. The final round personal HR was carried out separately.
In technical HR, they asked him (and others) about units of things like bandwidth, frequency, etc. Basic ECE questions only.
He said they only asked on question and he answered it wrong, but they still selected him. So nothing to worry about.
Good luck.
