As in Guido's previous, vague timing question - context and word defintion is lacking. Tricky questions are usually "tricky" because words have multiple meanings.
E.g. " #7 - if an injector injects fuel @ 23 deg BTDC where is #1 Crank pin "
BTDC of what? In the field of engineering - TDC can refer to the crankshaft throw, or the piston - and not always both at the same time. A piston can be loose or disconnected from the crank and be at 23 degrees before top dead center - and that crank pin might be just about anywhere.
Also - the word "injector" in that question does not state for which cylinder.
I hope these aren't questions written with the hopes of teaching somebody how to diagnose and/or fix an engine. Teach somebody core fundementals instead of mulitple-choice trick questions - and they might have a chance of using that knowledge - and adapting it upwards to many situations.
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