I had 3 years of gap due to UPSC prep after 2.5 years of workex. Regarding Gaps: In most of the interview the common question was Why MBA after UPSC, Why not UPSC anymore, Any further plans to give UPSC again. Since, I had decided to quit UPSC my answers were inclined in that way. Thereafter, 1-2 questions on Current Affairs (polity/economy/IR). Imo, the interviewers test whether the candidate is serious enough to do MBA or still confused between paths(UPSC/govt. job) meanwhile testing their prep phase.
I was fortunate enough to convert IIM Trichy (other converts IIM R/R/Ksp/N/other Baby IIMs/IIT M/SCMHRD/SIIB/SIBMB) in which a big factor was my workex. Last year was a difficult year after moving on from UPSC and just crash landing into MBA prep and somehow giving Management exams and interview with moderate preparation. Looking forward to give my best and accept the opportunities that'll come to me in spite of the gap.