Hi I am an admin manager i have recently done recruitment and selection courses and basically as you know most decent companies have core competency based questions ie customer service, working effectively with other people, communicating effectively, Ownership and responsibility etc the questions they ask will be based on their own competencies, for example they are asking why you would want to work there, you can say that because of your previous experience you can transfer your skills over and are keen to build/develop existing skills, or they may say why is teamwork important? or name a time when etc etc as long as you can answer the question they will be happy, The fact they are interviewing you is good as you obviously meet the criteria and job spec.
Hope this helps good luck...