Many times towards the end of the interview, the recruiter would ask you if you need to ask any questions about the post or the company. This is a good time to ask your doubts if any and get them resolved. It may so happen that you may not be given this opportunity. In such a scenario gauge the mood of the recruiter and then politely ask him/her if they were ok to answer your queries. If the answer is affirmative. Go ahead and clarify your doubts.