You are asking a two part question, in this case Make (A) and model (B)
Boolean mathematical logic:
A False, B False - Answer: False
A True, B True - Answer: True
A True, B False or A False, B True: Answer False
Normal Autopuzzles practice for a two-part question:
A Wrong, B Wrong - Answer: No, or better still: Neither
A Right, B Right - Answer: Yes
A Right, B Wrong - Answer: A is right but B is wrong
A Wrong, B, Right - Answer: B is right but A is wrong
Applying strict mathematical logic means people have to ask one part at a time even if they think the other parts are correct. In puzzles like this you should acknowledge which parts of attempts at a complete answer are correct.
I agree that answers like "Is it a Ford Anglia or Prefect" are actually double questions and the questioner should refuse to answer even if one is correct and say why. Alternatively he could answer "Which?". If the question had attracted several guesses, I might adopt the latter approach. I think you need to decide whether you want people to reach the answer or whether you want to mislead them.
So, is this car a Mercedes-Benz?
If answers are correct, you exactly don't need to use what you meant with your statement:
I think you need to decide whether you want people to reach the answer or whether you want to mislead them
1)
'Mercedes-Benz 540K Innenlenker 'Spezial Coupé' , #130944, the Paris Salon car 1936': In this question, I see only one special car!!! So the answer is 'Yes' or 'No'
Not: Mercedes: Yes, 540K: No, Spezial Coupe: No, 130944: No, Paris Salon: Yes, 1936: No
2)
Two part question: Alfa Romeo 1945?
If one part of this question would be right, my answer would sound like: Partly correct
3)
Best would be, to follow the rules correctly and asking only one part at a time. I think this is only fair, as it gives adventurers little chance of covering several answers with one question and robbing other players questioning options
I would like to stick to the rules and not have to constantly consider individual solutions. As this turns leisure activities into hard work