As you are undergoing CPL Training Your instructor should be teaching you all the considerations required of the task. By teaching rather than making you fumble and stumble, you will then be able to discuss each consideration with him. Maybe the instructor is short on knowledge himself
Centaurus is absolutely correct on this one. Its up to the Instructor (TRI) to instruct. How are you supposed to know anything, if you aren't given the information? Sometimes Instructors use this technique because they:
a) Have no clue
b) Know the answer and use the question to be-little the student and try to make themselves look good. (the opposite is true)
Any instructor wishing to gain the respect of his/her student and in the end, become busier than the rest of the cadré, is to learn technique, get into the books him/herself and impart the information to the students.
As a career TRI/TRE on heavy iron, I can assure you that this works. I don't know who is more tired at the end of the day of flying....Me from talking and instructing or my student from listening and HE/SHE ASKING ME QUESTIONS.......and...I'm a busy boy.
Cheers....find another instructor if this keeps up. Tell the instructor right off that you want to be taught, not question'ed to death.
Safe flying.......