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# BebeshKing

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Project Manager

## Previous Fields

• Engineering Field
Electrical
EIT
• Discipline
Electrical

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1. ## NCEES PE electrical and Computer practice exam 528

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. ## Transmission Line - power sent. (Shorebrook PE Exam Question 30)

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. ## Free Book Give Away!

Can I get one as well? 😊
4. ## Sharing Computer Based Exam (CBT) experience - PE Mechanical Engineering

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?
5. ## Discharging Coil between phases in transmission lines (Shorebrook PE Power exam)

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.
6. ## Share here your strategies for taking the CBT PE Power Exam

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
7. ## Discharging Coil between phases in transmission lines (Shorebrook PE Power exam)

what problem number is this?
8. ## Cram for Exam Vol 4 Question 10 - 4-Phase Systems and Polyphase Systems with more than 3 phases

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
9. ## Motors Locked Rotor Current - NEC Question regarding Tables 430.251 and Table 430.7(B)

Table 430.251(B) is the maximum LRC for the selection of Disconnecting means and controllers. Hope that will enlighten you.

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))
11. ## Free giveaway! - Hard Copies of the Electrical Engineering PE Practice Exam and Technical Study Guide!

Still keeping up the pace, solving problems after problems. . Excited to be with @Zach Stone, P.E. live sessions this coming August.
12. ## Free giveaway! - Hard Copies of the Electrical Engineering PE Practice Exam and Technical Study Guide!

45minutes to go..... I'm excited to know who are going to be the winners... . Hope I win

14. ## Free giveaway! - Hard Copies of the Electrical Engineering PE Practice Exam and Technical Study Guide!

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!!
15. ## NESC - Best way to navigate this?

@DuranDuran, would you care to share those page #s to where you have tabs? Thanks,
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