Aptitude Test : 20 Minutes
Quantitative : 20 Minutes
Reasoning / Analytical : 20 Minutes
Technical : 60 Minutes

Details of types of questions asked in each of the sections:
The questions were pretty simple and could be done if you have basics know how of Operating Systems,Data Structures and simple analytical questions and some puzzles.

They asked basically from Operating Systems as they were recruiting for Kernal development. They also asked briefly about OOPS concepts and compilers and spent a lot of time discussing about my projects.

HR interview was just a formality and he was mainly concerned about whether I will join the company if they offered me the offer letter. He also asked me about my hobbies and other companies I sat for.He also showed my written test and told about my performance.

The company is basically a networking company though they recruited this time for kernal devolepment. So be thorough with networking and basics of OS,compilers and OOPS. And Most importantly apply for the company only if you are only interested in networks and want to go for research. If you are looking for package point of view,my advice would be to look for some product/service oriented companies.

The overall process was very easy and fast. There was only 1 technical and 1 HR round. I was the first person and entire procedure got over within 2 hours.