Remember that in this, as in all interview questions, you are still being quizzed and examined. The fact that your responses are being framed as questions for the department makes no difference at all. Your questions can’t simply be candid queries to supply yourself with information. Rather, they need to continue to reflect your fit and preparedness for the job.
That means your questions should show an understanding of the departmental and campus profile and mission, and should also indirectly communicate that you will be a pleasant and collegial colleague.