this will vary from organisation to organisation and interviewer to interviewer as well as from role to role.
In the context of an interview with myself at the organisation I work at for an experianced automator using silktest the questions would fall into the following groupings:
Skills based - Factual
Experienced based - Situational and comparative examples
Technical competancy Based - Hands on audition
Approach based - white board and discussion
General questions on automation - with the expecation these will be aligned to the interviewees experience with the specific tool and any wider experience they have.