hello micia,
yea sometimes if the sim instructor relizes that the candidate is doing quite well he will throw a couple of questions at her/him to see what kind of capacity the individual hold.
if you are already at max capicity you should just answer i dont know, but they basically use it as a tool to rattle the person in the sim, if they have alot of people to get through it weeds out alot of people who do get rattled by continously thinking about the question and not concentrating on flying the airplane. its a bit ruthless but the best way to get 10 people ou of 25 that are trying for the position
fh