Search results

Professional Engineer & PE Exam Forum

Help Support Professional Engineer & PE Exam Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. nukem2k5

    Cut Scores

    I sense a troll.
  2. nukem2k5

    How to calculate SR (Speed Regulation), when no-load rpm isn't given???

    Is the reason that we neglect the angle of the voltage because: we only care about the difference in magnitudes, and the angle is only relevant to the power factor?
  3. nukem2k5

    Please help me understand how to understand/calculate asymmetrical from symmetrical

    All the papers and textbooks I've read show that the peak asymmetrical current (including DC offset component) is simply sqrt(2) times the RMS symmetrical fault current.  However, when you look at breaker ratings, the given asymmetrical interrupting rating is never a simple multiplier difference...
  4. nukem2k5

    How to calculate SR (Speed Regulation), when no-load rpm isn't given???

    Make sure you use absolute values.  One of the practice test questions asked a simple question about voltage regulation and the no load voltage was given with an angle. 
  5. nukem2k5

    How to read sequence diagrams of XFMRs, generators, etc.?

    It's not clear to me how to interpret whether current will flow through (or in) a piece of equipment e.g. XFMR) given its sequence diagram.  Specifically, zero sequence is confusing me, because my understanding is that it has to involve ground (is that accurate or a misnomer?).  Refer to...
  6. nukem2k5

    Equation for DC component of short circuit current

    My SOPE notes, as well as the diagram in the Camara book (and on this site: http://myelectrical.com/notes/entryid/134/dc-component-of-asymmetrical-faults) show the equationas being (2)*sqrt(2)(I"_k) Is that really a 2 multiplier, or is it meant to indicate that it's a square root (and not 2 x...
  7. nukem2k5

    Where can I buy Tom Henry's Keyword Index for ~$20?

    For some of the less ubiquitous material (Square D Paralleling XFMRs, Reliability Engineering, Chapman, Gonen, etc.) -- were these resources in which you had maybe 1-2 questions on the exam that you were able to answer by digging through the TOC / index of those books?  Or did you actively study...
  8. nukem2k5

    When must the 30deg phase shift be accounted for in calculations?

    I've found that sometimes the 30 degree XFMR phase shift is used, and sometimes it's seemingly irrelevant or disregarded.  This is even the case when we aren't necessarily going through a transformer, but even when simply converting from a phase to a line voltage, for example -- this is...
  9. nukem2k5

    3rd, 5th, and higher order Harmonics

    Oh I see you're asking how the frequency directly amplifies the dissipated power. That's a good question. I'll try to look into it.
  10. nukem2k5

    3rd, 5th, and higher order Harmonics

    Harmonics increase the current flowing through the circuit/load, and power = I^2 x R
  11. nukem2k5

    Where can I buy Tom Henry's Keyword Index for ~$20?

    For some of the less ubiquitous material (Square D Paralleling XFMRs, Reliability Engineering, Chapman, Gonen, etc.) -- were these resources in which you had maybe 1-2 questions on the exam that you were able to answer by digging through the TOC / index of those books?  Or did you actively study...
  12. nukem2k5

    Where can I buy Tom Henry's Keyword Index for ~$20?

    TWJ, I'm wrapping up my School of PE classes this week, and then I have Spin-Up, Complex Imaginary, and NCEES practice tests that I plan to focus on throughout October.  Other key study/reference material that I have include: Camara book (fairly useless) Guide to Passing the Power PE Exam...
  13. nukem2k5

    Where can I buy Tom Henry's Keyword Index for ~$20?

    It's that much better than simply using the index?
  14. nukem2k5

    Where can I buy Tom Henry's Keyword Index for ~$20?

    Every online bookstore I've found sells the book for $16-18, but includes at least $10 for shipping.  Sadly it's not on Amazon nor Half (eBay).  Everyone says "best $20 you'll spend for the test" but I can't find any vendors selling it for $20 after tax/shipping.
  15. nukem2k5

    Engineer Skills

    As in $ donation?
  16. nukem2k5

    Engineer Skills

    I'm beyond 5 and still can't edit, from what I can tell.
  17. nukem2k5

    Calculating reactive capacitance for Pi model of Medium-length T-line

    Attached the diagrams here, since I apparently don't have permission to edit my posts yet...
  18. nukem2k5

    Calculating reactive capacitance for Pi model of Medium-length T-line

    The SoPE problem #288 shows that we calculate the discrete capacitive reactance for a Pi model by dividing by the Cap Reactance (given in Ohm * Mile) by half of the total line length (L/2), and that this is done for the caps shown at both ends (sending and receiving).  I expected that the value...
  19. nukem2k5

    3rd, 5th, and higher order Harmonics

    I'm no expert on harmonics but I don't think there are any rules of thumb dictating the amplitude of a given harmonic order.  It depends on the attributes of the load in question.
  20. nukem2k5

    NCEES Power Question # 132

    I came here to look for this exact NCEES practice problem.  To address your question, they aren't converting any impedances to different bases.  It's simply a voltage / impedance calculation. That being said, the thing I'm curious about is why they're using sqrt(3) in the equation.  The voltage...
Back
Top