You bring a very important and interesting point which is rarely discussed in the public domain. It is the accurate match between what students are trained on and what the standard certification calls for.
With respect to the standard requirements, Body of Knowledge BoK is very brief (too brief in my opinion) to the extent that a training manual of 100 pages might be too much to cover all topics. Because of this reason and other reasons, training agencies, usually, add more meet to their manuals such as:
1. More basic background information
2. Higher-level details that are part of higher certification levels
3. More (relatively) advanced details and applications that are not classified by the standard.
Well, is this what the students are interested in? I guess it depends. Some trainees are interested to get as much information from the class as possible. Some trainees are clearly focussed on passing the exam and not interested in anything else (during the training).
Particularly for Q 147 and if the data acquisition time is taught in Cat I, up to my limited knowledge yes it is taught. To what extent? It varies. Is it part of the minimum standard requirements (Body of Knowledge of ISO 18436-2)? I do not think so.
Why is Q 147 included in the practice Question Bank? Simply because there are training agencies that teach it in their Cat I manuals. Cat Prep I series does not replace or substitute the existing training materials, it complements them. It reinforces the understanding of what is taught by practicing questions.
However, I've to emphasize that I'm not (officially) affiliated/biased to any of the certification bodies and what I sied may not necessarily represent their viewpoints. I respect their contribution to the development of the professionals in our field and the advancements of the vibration field in the industry.
Regards- Ali M. Al-Shurafa