If you are studying for your extra, get that upgrade soon or you may have to study for a whole new pool of questions.
BTW at least one of the answers is wrong but "acceptable". Make sure you get it right for practice but know the limit for on the air use.
You will
not see it on the test but you will find it in many practice areas/sites.
E1F13: Has to do with max power for spread spectrum. It was 100 watts and is now 10 watts.
I repeat you will not see it on your test!If you use spread spectrum the ARO (Amateur Radio Operators) can only use 10 watts now. There are 300 plus watts Amps for the 900MHZ band still legally for sale but not usable in the amateur environment.
http://www.arrl.org/news/ncvec-deletes-question-from-amateur-extra-question-poolThe group of questions that have been removed from the Extra Element 4 Pool Test (effective July 1, 2008 - June 30, 2012) are:
E1C04
E1C05
E1F13
E2E10
E8C04
E9C16
Get them right for the practice sites that score you but understand that
they will not be on the exam.