caley89
Well-known member
I see that they have a new one listed, copyright November 2016. Anyone have both and compare?
I meant to say that I bought the Machine Design and Materials book, not the MSM book. MSM is what they called it before 2017.I'm bought the new book when I registered for the exam (saved a few bucks that way). I took a quick look through it (I bought the Mechanical Systems and Materials) and I saw 28 new questions. The questions are in a different order than the 2011 book, so it threw me off at first. Even if I mistook a few for new, there's easily 25% new questions in the book. If the book goes for $40, you're spending about $25-$30 for new questions. To me it's worth it, YMMV.
Would you mind pointing out which problems are solved incorrectly? The only mistake I have found thus far is that they solved the problem as I have and arrived at the same answer but selected the wrong letter (problem 515).Just wanted to point out that I have found several errors in the book. Most of the errors are in the answers for the problems. The incorrectly show how to answer the question and the answer they get doesn't jive with the way they show how to do it. This may cause frustration for those that are not as familiar with the content (meaning those types of problems) and may require additional research while trying to learn the material.
First of all, there are no units on the flow, so that should be a clue to you that this is a logic problem and not one where you need to find a hard and fast solution.Pump in parallel you sum the flow while head remains constant. Then where the system curve intersects the sum of the parallel pump curves you get your operating point. 3 pumps in parallel @ 230*3=690 GPM the pump provides 35 ft of head not 65-70 ft.
I didn't use a ruler but eyeballing 65 ft on the system curve I get about 600 GPM. Divide this by number of pumps (3) I get 200 gpm required by a single pump at 65ft head. The single pump curve is clearly lower than 200 gpm.
167 gpm is where the combined 3 parallel pump curve intersects the system curve.
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