When I was a line trainer, and at every airline I’ve worked for before or since there was no need for a “line check question bank”. When I first started as a line trainer we would do checks from an operating seat, but that changed at the end of the 1990s and since then annual and final line checks have been conducted from the jump seat observing a properly constituted crew. Normally the check is also to assess CRM and NOTECHS as much as flying; and those can’t be assessed if the line trainer is interfering, if I was being checked and the trainer started interrupting with irrelevant questions I would ask them to shut up or sit in the cabin and let us get on with the job of safely operating the aircraft in accordance with company SOPs.
Line training sectors, of course, are different.