Every attempt is made for accuracy in every portion of the guide. It pains me to find mistakes, but I post them here in an effort for complete clarity and most importantly to aid in better exam prep.
I greatly appreciate any and all feedback from users in improving this guide. All of these updates are incorporated for future editions.
2017 PE Prep Guide Errata
Versions 1.01 through 1.05 (version number noted on backside of first inside page):
Formula 2.6, 2.7: Title for 2.6 should read "Lower Flam. Limit - Other Pressures". LFL for 2.6 is lower flammability limit "at any pressure". Title for 2.7 should read "Lower Flam. Limit - Normal Atm. Pressure".
Formulas 2.12, 2.13: Compartment mass ventilation rate should be in kg/s, not cu. m/s. Per SFPE (5th) p1007, cubic m/s x 1.18 kg/cu. m = kg/s.
Formula 9.10: Sp.G. is specific gravity of "liquid", not "gas".
Question 21: Mass ventilation rate should be in kg/s, not cu. m/s. Per SFPE (5th) p1007, cubic m/s x 1.18 kg/cu. m = kg/s. Answer is still c, but at 335 K.
Question 32: Assumed radiative fraction is listed at 25% but noted as assumed at 35%. 35% is more appropriate, resulting in a radiant flux of 2.4 kW/sqm.
Question 77: The T.T. Lie Equation (from SFPE 4th p4-350) was removed from SFPE (5th) Edition, so this question could not be used on the 2017 Exam.
Question 106: Solution should round to 500 gpm for flows above 2,500 gpm (per FPH 15-25). Solution becomes 3,000 gpm.
Question 109: The quick-reference charts from the SFPE 4th Edition were pulled from the 5th. C-factor should be given. See new problem and solution.
Question 113: Solution should read 50 occupants. See full solution.
Questions 126, 143, 147, & 151: The solution does not match the original question. Solutions: 126, 143, 147, 151.
Versions 1.01 through 1.04 only:
Formulas 5.18-5.21: References should be to page 13-377 and section A.10.6.2, not 13-339 and A.10.8.2.
Question 49: Thrust block should be calculated using the Outside Diameter (4.5 in), not the nominal diameter. Answer becomes 3,936 lbs.
Question 101: The solution does not match the original question. See full solution.
Versions 1.01 through 1.03 only:
Question 5: The probability tree is here: probability tree.
Question 66: The question should read "Which of the following do not indicate deterioration of a battery?"
Question 70: The answer should be 10.2 square meters (b), not 12.2 square meters (c). The solution units should also be "kg/s".
Versions 1.01 and 1.02 only:
Question 56: The specific volume of the agent was calculated for HFC-125, not HFC-227ea. See updated solution.
Question 57: The specific gravity shown is irrelevant to the problem (it does not affect the solution).
Question 110: The agent's specific volume was calculated for HFC-125, not HFC-227ea. See updated solution.
Question 121: The worked portion of the ELADJ shows use of a 6-inch pipe, which should be 2.469. The solution is still correct.
I greatly appreciate any and all feedback from users in improving this guide. All of these updates are incorporated for future editions.
2017 PE Prep Guide Errata
Versions 1.01 through 1.05 (version number noted on backside of first inside page):
Formula 2.6, 2.7: Title for 2.6 should read "Lower Flam. Limit - Other Pressures". LFL for 2.6 is lower flammability limit "at any pressure". Title for 2.7 should read "Lower Flam. Limit - Normal Atm. Pressure".
Formulas 2.12, 2.13: Compartment mass ventilation rate should be in kg/s, not cu. m/s. Per SFPE (5th) p1007, cubic m/s x 1.18 kg/cu. m = kg/s.
Formula 9.10: Sp.G. is specific gravity of "liquid", not "gas".
Question 21: Mass ventilation rate should be in kg/s, not cu. m/s. Per SFPE (5th) p1007, cubic m/s x 1.18 kg/cu. m = kg/s. Answer is still c, but at 335 K.
Question 32: Assumed radiative fraction is listed at 25% but noted as assumed at 35%. 35% is more appropriate, resulting in a radiant flux of 2.4 kW/sqm.
Question 77: The T.T. Lie Equation (from SFPE 4th p4-350) was removed from SFPE (5th) Edition, so this question could not be used on the 2017 Exam.
Question 106: Solution should round to 500 gpm for flows above 2,500 gpm (per FPH 15-25). Solution becomes 3,000 gpm.
Question 109: The quick-reference charts from the SFPE 4th Edition were pulled from the 5th. C-factor should be given. See new problem and solution.
Question 113: Solution should read 50 occupants. See full solution.
Questions 126, 143, 147, & 151: The solution does not match the original question. Solutions: 126, 143, 147, 151.
Versions 1.01 through 1.04 only:
Formulas 5.18-5.21: References should be to page 13-377 and section A.10.6.2, not 13-339 and A.10.8.2.
Question 49: Thrust block should be calculated using the Outside Diameter (4.5 in), not the nominal diameter. Answer becomes 3,936 lbs.
Question 101: The solution does not match the original question. See full solution.
Versions 1.01 through 1.03 only:
Question 5: The probability tree is here: probability tree.
Question 66: The question should read "Which of the following do not indicate deterioration of a battery?"
Question 70: The answer should be 10.2 square meters (b), not 12.2 square meters (c). The solution units should also be "kg/s".
Versions 1.01 and 1.02 only:
Question 56: The specific volume of the agent was calculated for HFC-125, not HFC-227ea. See updated solution.
Question 57: The specific gravity shown is irrelevant to the problem (it does not affect the solution).
Question 110: The agent's specific volume was calculated for HFC-125, not HFC-227ea. See updated solution.
Question 121: The worked portion of the ELADJ shows use of a 6-inch pipe, which should be 2.469. The solution is still correct.
