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BebeshKing

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About BebeshKing

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    Project Manager

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  • Engineering Field
    Electrical
  • License
    EIT
  • Discipline
    Electrical

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  1. Which part of the solution you don't understand, though? The formula for efficiency is efficiency=Pout/(Pout+Core loss+Copper loss). Pout=KVA output(pf)=10kVA(1.0)=10kW Core loss=No load loss=Open ckt power consumption=69W Copper loss=(I^2)R where I is the current at the high-voltage side. I=Spri/Vpri=10,000kVA/2,300V =4.35A Copper Loss=(4.35)^2(10.9)=206.05W So, efficiency=10,000/(10,000+96+206.05) x100 =97.3% (answer)
  2. I have a concern with this problem, though. The problem was asking the "MAXIMUM" power transmitted. should we just use Pmax=(Vs)(Vr)/X ,where phase angle should be 90 degrees during maximum power?
  3. Regarding any CBT PE exam, When you are asked about a Code problem? Are they going to give you the access of the whole code book in PDF? or are they just going to give the limited pages of the code book specifically to solve that code problem?
  4. Discharging coil can be found in a capacitor bank protection. They are typically use to discharge any residue from the capacitor after the bank is switched off due to fault or any other situation that the capacitor bank needs to be out of service.
  5. Now that we are transitioning from Pencil & Paper to Computer Based Test for the PE Power, what is you strategy in taking this from open book to a closed book exam? Here are my personal strategies: 1. Get familiar with the PE power reference handbook 2. As much as possible, don't memorize much formulas, and yet, learn to derive them. 3. Specialty formulas that can be easily plug and play during the exam are the ones to be memorized. 4. Try to use PDFs for the codes and PE power reference handbook and use the search lookup to get hang of it. 5. Try to do pra
  6. I haven't seen the Cram Vol.4 yet but this is my personal explanation. If you know where the square root of three and 30 degree phase shift came from in a 3 phase balanced system, you will be able to derive any polyphase balanced system. As you mentioned above, each phase is separated by 90 degrees since its 360/4 = 90 degrees. So, if you need to find the line voltage, let's say Vab. So,. Vab=Van-Vbn = (V<0) - (V<-90) = V(square root of 2 <45) , where V is the per phase voltage magnitude. Therefore ,the the line voltage for a 4 phase balanced system is squ
  7. Table 430.251(B) is the maximum LRC for the selection of Disconnecting means and controllers. Hope that will enlighten you.
  8. One of the best technique I learned as well, in terms of power factor correction using CAPACITOR BANK. **correction to your formula though, it should be: Qc = P * (tan(theta old) - tan(theta new))
  9. Still keeping up the pace, solving problems after problems. . Excited to be with @Zach Stone, P.E. live sessions this coming August.
  10. BOOM! You are awesome Zach! I'm currently enrolled to your Premium Online Review Course.Your videos/modules are very helpful and informative. I would love to have a free hard copy of your Practice Exam and Technical Study Guide. Thank you!!
  11. @DuranDuran, would you care to share those page #s to where you have tabs? Thanks,
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