There was a famous anecdote of when Yoshimune interviewed a group of roju after becoming a shogun, but only person who left without embarrassment was Masanao, who answered two out of three questions.
吉宗は将軍につくと、老中たちに口頭試問をしたが、なんとか恥を掻かずに済んだのは3問中2問を答えられた政直のみであった逸話は有名。