Why D ?is not the answer
Large building will have room for dual duct runs. More efficient than reheating cooled air.
In the real world I’d have picked D, too. But I think Joel is right that “large building” is a clue in the question that there is room for two separately ducted systems.
Dual duct is never the right answer (the mechanically cooled air and mechanically heated air are always mixed in the room, so worse than reheat, which only reheats cooled air in the relatively small number of hours where the rooms served by the same AHU need simultaneous heating and cooling, rather than heating cooled air all the time). Dual duct systems have not been used since the energy shocks of the 1970s. I don’t know where you found this question but it is a misreading of a book at its most charitable interpretation. It would be like having the answer to a physician licensure question include a correct answer “smoking is an effective way to relax a nervous person”
thank you very much! Joel Edwards Christine Williamson Cronin
Does NCARB know that "Dual duct systems have not been used since the energy shocks of the 1970s."
The question is from ballast.
Good question…if it’s still presented as an option in MEEB, my bet is that some volunteer could make a correct answer out of it and there’s a chance it would not be flagged. I find that the best strategy is to assume that the test items you see on an exam are sound, as most of them are.
Kara, I've found no cohort of people more prepared to take these exams than those who CORRECTLY identify problems in study material. It means you own the content.
Sure there are some who identify "conflicts" between study materials that are not conflicts at all, and instead suggest an inability to recognize positive ambiguity, uncomfortable that two things can be true at the same time, and that group doesn't do well on these exams. . . but you've posted a few times over the past few days with concerns about practice exam problems that are clearly poor questions on their technical merit. We've enrolled 30,000+ emerging professionals and I can say with certainty that if you are waiting to learn more before taking these exams, you should not wait any longer. Schedule them now for as soon as possible (you can keep learning after you get licensed).
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