I recently went on a interviewing spree awhile back and wrote down some of the more common questions I was asked.
The most common question is: 3 strengths and your greatest weakness. This is your chance to shine. You should definitely have answers prepared for this one.
One of the most important questions that I generally see is: What was an example of an extremely stressful day/project and how did you deal with it? You want a specific example for this.
Why did you apply to *this* hospital or *this* position?
Short term/long term goals?
Another common question is about time management skills.
Generally, HR will have a few mandatory questions. Usually they relate to: an example of great customer service. Your position on attendance.
Always have questions of your own. Benefits, goals of the hospital, projects. Anything and everything.