The important thing here is not years of experience, the question to ask depends on what role you are claiming in that project.
If you have claimed your role as main developer, interviewer may ask all about that project, what are the architecture, technical implementations etc.
If you have claimed your role as one of the developer working for a module, you will be asked all about that module.
The general technical questions about technologies used in that projects would be common to all. For 3+ years of experience, generally the questions would be targeted towards technical implementations, problem solving techniques etc.
I would suggest you to test your knowledge online at
http://www.dotnetfunda.com/interviews/interviewresult.aspx before going for interviews. This will help you a lot.
Thanks
Regards,
Sheo Narayan
http://www.dotnetfunda.com
Shreedar, if this helps please login to Mark As Answer. | Alert Moderator