In preparation for an interview, come ready to discuss your portfolio at length as well as your design process and what design software you are familiar with. Graphic design positions can be very specific to the company so make sure you brush up on the company's current design style and are ready to explain how your style and experience will mesh.
What is my favorite font?
I like Segoe UI. It's friendly, but professional, kind of like Calibri, but not everywhere.