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About justin-hawaii

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    Justin PE
  • Birthday 12/16/1984

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  1. Sorry about the confusion with the two different formulas. You will get the same magnitude with both formulas, it is just the angle of currents will be 90 and -90 vs. 30 and -30. Since the angles are relative, both will satisfy the solution. The derivation of the a^2 - a term can be seen below. IB = I0 +a^2 * I1 + a * I2 IC = I0 +a* I1 + a^2 * I2 but you know that I1 = -I2 and I0 = 0 IB = a^2 * I1 - a * I1 IB = (a^2 - a)* I1 and IC = I0 +a* I1 - a^2 * I1 IC = (a-a^2)* I1
  2. I will send an email out to those that purchased a engproguides product. I am looking at a couple of weeks from today.
  3. @roy167 The equation you are using is for a fault between phase B & phase C. I think that is the confusion. The graffeo book has V_b = V_c, meaning that the fault is between phases B & C. For a fault between phase A and B, V_a = V_b and Ic1 = -Ic2; so the current in IC = i0 + i1 + i2 = 0. I have been working on these cheat sheets for Engineering Pro Guides and it is only a draft. This one is for fault current analysis, hopefully it clears up the confusion on the problem. I appreciate any feedback. Fault Current Analysis - Draft Engineering Pro Guides.pdf
  4. @danielle.passaglia I just realized that you have a much older version of the full exam. That version looks like it is from 2017-2018. Please send me the email used to purchase the product and I can reactivate your link, so you can get the latest copy. I have additional problems that I have added based on feedback over the years and I have also fixed errors.
  5. I am sorry for the confusion. Yes, you are correct. I will fix that error and add it to the errata.
  6. I think you are very close to passing. It really is just those applications problems. Those problems are based on experience with this systems and equipment, but if you don't have experience with designing and/or specifying those systems/equipment, then you can study the ASHRAE books. Just go through the relevant chapters in the ASHRAE books and that should prepare you to get more problems in that section. I put together this webpage to outline the relevant chapters for each piece of equipment and system. https://www.engproguides.com/hvacreferences.html
  7. I am not sure if you still needed help but here is a discount code to more practice problems and a guide on the key concepts and skills for each of the topics. It seems like something may be missing in your understanding of Material Properties & Processing, Mechanics, E&M and Computational Tools, Engineering Economics and Ethics. Website: http://engproguides.com/fe-mechanical-exam-guide.html 10% Discount code: EBMECHFE
  8. This website looks pretty good. There's a lot of information but the NCEES specifically calls out Battery Characteristics & Ratings, so you might want to focus on these sections in the website. Sections: Discharge, Charge, Types. https://batteryuniversity.com/learn/
  9. 1. Pipe Systems: ASHRAE Fundamentals, Chapter 22 Pipe Design 2. Joints: ASHRAE Systems, Chapter 46 Pipes, Tubes and Fittings 4. Control Valves: ASHRAE Systems, Chapter 47 Valves 5. Actuators: ASHRAE Systems, Chapter 47 Valve & https://www.parker.com/literature/Industrial Cylinder/cylinder/cat/english/0106c002.pdf I have my take on the entire NCEES outline topics and references for each topic on this webpage. http://engproguides.com/thermalreferences.html
  10. Sorry for the delay, please see link below. http://engproguides.com/poweroct18results.pdf
  11. Please try this link. https://drive.google.com/drive/folders/1qGrnnJh3ux9pDCXWJOtm9wpApbt1rVB3
  12. 15.1 is the latest version. Should be last modified on December 22nd.
  13. I think you should definitely create your own binder and cheat sheets. I have shared my cheat sheets as a starting point. It is in Word format, so you can edit it as you see fit. http://engproguides.com/free-pe-cheat-sheets.html
  14. I just activated the link, see here: http://engproguides.com/machineoct18results.pdf The highest fail score reported was 48/80 for MDM. No Texas MDM percentage was reported in the survey.
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