Problem 14. An empty N180 pipe has 40,000 psi tension applied to it. The reduced collapse rating is closest to what percent of pre-tension rating? A) 0%, B) 45%, C) 55%, D) 65%.
This is straight out of the Guidebook on 6 DTC 3; the collapse pressure rating is reduced to 65.1%.
Note the equation in the new Reference Guide (provided with the exam) is on page 55 of Chapter 2. One really has to get used to this reference, since it's not very intuitive where one would expect to find it. You can waste a lot of time looking for it if you don't have it very well mapped out before the exam.
Note: it was pointed out to me today by a steely-eyed engineer that the Kindle problem asks for "percent reduction" making the answer 1-0.65 = 35% or (B), not (D). I actually like this mistake, since it gets one thinking about how clever and tricky the wording on these problems may be...one can't be too careful here. Read, read again, and then read once more...
No comments:
Post a Comment