They will usually have at least 2 people in every interview. They ask more personal questions I think to get an idea of your personality, and whether you would be a good fit for working with their other employees. The questions are not too tough. Your usual interview questions about where you worked previously, what you liked about it, why you left, etc.
Interview questions [1]
Question 1
They asked how I would rate myself on a scale of 1-10 on various skill sets. Whatever was my highest rating, they would ask why I chose that as being the thing I rated myself highest in.