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July 2004 Professional Challenge · Jul 1st

Engineers holding PE or EIT licenses have higher average incomes than engineers who do not. To encourage registration, we present typical examination problems from registration examination preparation manuals. Readers are invited to solve the problems and submit their answers to us. From among the correct solutions we will select monthly one reader who will receive a free one-year extension to his subscription. The Virginia Engineer cannot respond to individual requests for explanations as to why answers other than those published are not also correct. Mail answers to The Virginia Engineer, 7401 Flannigan Mill Rd., Mechanicsville, VA 23111; or fax answers to 877-779-3032, or e-mail answers to challenge@vaeng.com
The deadline for answers to this month’s problem is July 8th.

The July Problem—Fluid Flow
“Would you just look at this old pipe,” the Chief Engineer says to the Plant Engineer as they stand looking down into the trench. “It’s cast iron, with an equilateral triangular cross-section of 20.75 inches. We measured the flow rate at 6,000 gpm, and the coefficient of friction is 0.017. We could still use it if the pressure drop isn’t too great. I wonder what the pressure drop is per 100 feet of pipe?” “Well,” the Plant Engineer says as he punches rapidly on his hand-held, “It works out that the pressure drop is . . .

(A) 10.32 lbf/ft2 (B) 24.3 lbf/ft2 (C) 48.7 lbf/ft2 (D) 121.0 lbf/ft2 (E) 178.5 lbf/ft2

There were no correct answers to June’s problem

The June Problem—Stoichiometry
“The supplier promises that this new coal is really, really good,” the Chief Engineer tells the Plant Engineer. “By weight it’s 79 percent carbon and 6 percent ash. We did a test burn in the furnace and the clinker in the pit was 90 percent ash and 10 percent carbon. What is the percent of coal burned?” “Well,” the Plant Engineer replies as he punches in the numbers on his hand-held, “On a carbon basis, we ought to get . . .


(A) 89.09% (B) 91.9% (C) 98.0% (D) 99.15% (E) 99.33%

July 04 Challenge Answer


CORRECTION
The correct solution to May’s problem was submitted by
Paul T. Fernan
JHU APL
Suffolk, VA

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