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JB66money

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About JB66money

  • Rank
    Supporting Member to Examinees
  • Birthday October 16

Previous Fields

  • Engineering Field
    System Protection and Planning
  • License
    PE
  • Calculator
    TI
  • Discipline
    Electrical

Profile Information

  • Gender
    Male
  • Location
    IL
  • Interests
    1. System Protection
    2. Power Quality
    3. Transmission and Distribution Planning

Recent Profile Visitors

785 profile views
  1. This problem can also be solved using the per-unit method. When using the per-unit method there is an impedance associated with the fault duty. This obtained first by getting the per-unit apparent power which is found by using the 1000kVA rating of the transformer the system's base apparent power and converting it into MVA, which is 1MVA. Next the fault duty's per-unit value is S=40MVA / 1MVA = 40p.u. Next the per-unit impedancnce associated with the fault duty is z =vpu2 / spu= 12 / 40 = .025pu. Next we find the per-unit fault current is i.fault_pu = 1 / (.04+.025) = 15.38pu.Next the base current on the secondary side of the transformer where the fault occurs is Ib = (1000*103) / (sqrt(3) * 480 ) = 1202.81Amps Finally we determine the acctual fault current by multiplying the per-unit fault current by the base current on the secondary side of the transformer.IFAULT = i.fault_pu * Ib = (15.38)*(1202.81) = 18499 Amps.
  2. KDuff, The reason that they used 1/.09, is because that is the per-unit value of the current. The term 1 is the per-unit voltage because it is assumed that the bus voltage and the base voltage are the same and since V(per-unit) = V(actual) / V(base) =1 p.u.. That is how 1 came about. and since the transformer impedance is given as 9%, it was converted to per-unit which is .09 per-unit. Therefore the per-unit fault current at that bus is iper-unit = 1/.09 p.u. and it was multiplied by 3200A, because the the 3200A was chosen to be the bus current.
  3. Kduff70, It is true that you need to focus on concentrating on understanding the principles and concepts of each topic. I believe the best way to achive this is that when you are solving problems or answering question is to try to identify those key principles and concepts used to solve the problems. Try not to get caught up in mathematical algorithms or particular problem types. This is important because when you go to the actual exam you will be trained to identify principles and concepts and not particular problem types or mathematical algorithms. Also don't waste to much time getting worked up on how some textbook solved some obscure convoluted problem during your study. Identify pkey principles needed to solve it but keep moving.
  4. It was May 22, 2014, I was away from the office training. During a break I checked my email after everyone returned to class as had been doing for a few days prior. I logged in and not expecting to see anything, but to a plesent suprise I saw the word Passed and my heart started to beat so fast that I had a panic attack. I thought that I had lost my mind, so I looked at it again and saw Passed and sat down took some deep breathes and I was calm by then. I return to class and told one of my classmates who was an engineer and my instructor who already had his PE. My instructor congratualted me and announced it the rest of the class who were non-engineers. Most of them did not know what the PE was and it made no difference to them one way or the other. But for the three of us who were engineers, it was a big deal.
  5. I thank God that He blessed me to pass both the FE and PE exams before they were converted to CBTs. I don't care if I had to wait before I got my results. There is nothing like the printed word in front of you.
  6. That would suck if they made the PE exam a CBT exam. Be careful of what you wish for., you just may get.
  7. The best way to prepare for the FE and PE exams is to study the topics listed by NCEES until you understand the fundamental concepts, principles and practices pertaining to those topics listed. Then solve problems in the NCEES books as well as basic problems in some text books and other sources. Also do not get hung up on particular problems or solutions to problems, but undersatnd the priciples behind the solutions as they relate to the topics. There really is not a single stand alone source that contains all of the topics listed by NCEES, you just have to obtain the basics about those topics from multiple sources. As far as the FE exam, the best place start is to become very familiar with the reference manual provided by NCEES. Learn / Re-learn and understand the principlescontained in the reference guide, then begin to solve the problems in the practice exam provided by NCEES, but also solve problems from other multiple sources. If you learn to understand the principles behind those formulas and laws ect. (use your text books to for clarification of principles, theorems or laws that may not be clear in the manual) contained in the reference manual, then you will be able to solve the majority of the problems on the actual FE exam correctly. Again, do not go into the exam expecting to see problems that were on practice exams, but expect to see the fundamental principles listed in the NCCES topics for the specific exams.
  8. The best way to prepare for the FE and PE exams is to study the topics listed by NCEES until you understand the fundamental concepts, principles and practices pertaining to those topics listed. Then solve problems in the NCEES books as well as basic problems in some text books and other sources. Also do not get hung up on particular problems or solutions to problems, but undersatnd the priciples behind the solutions as they relate to the topics. There really is not a single stand alone source that contains all of the topics listed by NCEES, you just have to obtain the basics about those topics from multiple sources. As far as the FE exam, the best place start is to become very familiar with the reference manual provided by NCEES. Learn / Re-learn and understand the principlescontained in the reference guide, then begin to solve the problems in the practice exam provided by NCEES, but also solve problems from other multiple sources. If you learn to understand the principles behind those formulas and laws ect. (use your text books to for clarification of principles, theorems or laws that may not be clear in the manual) contained in the reference manual, then you will be able to solve the majority of the problems on the actual FE exam correctly. Again, do not go into the exam expecting to see problems that were on practice exams, but expect to see the fundamental principles listed in the NCCES topics for the specific exams.
  9. The best way to prepare for the FE and PE exams is to study the topics listed by NCEES until you understand the fundamental concepts, principles and practices pertaining to those topics listed. Then solve problems in the NCEES books as well as basic problems in some text books and other sources. Also do not get hung up on particular problems or solutions to problems, but undersatnd the priciples behind the solutions as they relate to the topics. There really is not a single stand alone source that contains all of the topics listed by NCEES, you just have to obtain the basics about those topics from multiple sources. As far as the FE exam, the best place start is to become very familiar with the reference manual provided by NCEES. Learn / Re-learn and understand the principles contained in the reference guide, then begin to solve the problems in the practice exam provided by NCEES, but also solve problems from other multiple sources. If you learn to understand the principles behind those formulas and laws ect. (use your text books to for clarification of principles, theorems or laws that may not be clear in the manual) contained in the reference manual, then you will be able to solve the majority of the problems on the actual FE exam correctly. Again, do not go into the exam expecting to see problems that were on practice exams, but expect to see the fundamental principles listed in the NCCES topics for the specific exams.
  10. I hope that you all passed this round, and always try to remember that it is not if you pass the PE, but when you pass it. So never give up, after you pass, you will definitely become better engineers even though some of you may already be good engineers. May God bless you all.
  11. Saif, a person should never give up on anything. Just because something is difficult and requires time does not mean that it is not meant for a person. Some people may require five attempts before passing, but that experience may make them become an expert as well as build character.
  12. zm83, I used the same references that you used when I took the PE last year this time. I felt the same way about all of the references that you mentioned except Pansini, I did not have his book. I had James Burke's book Power Distribution Engineering, which was helpful during the exam and very helpful on the job. I also feel the same about Stephen Chapman's versus Theodore Wildi's books. Although Wildi's book is popular on this forum and is "easier to understand" because it has less mathematics than Chapman's, Chapman explains the topics of generators, transformers and motors much better than Wildi does in my opinion. As far as passing the exam, I believe that undestanding the fundamental concepts, principles and practices which enables you to use your tools effectively, is the key to passing the exam.
  13. I felt last year like you all feel currently, the only thing that I could remember about the exam were the 8-9 problems that I was certain that I missed and the more days passed by the more I felt that I would have to re-take the exam. However, when the results were released, I passed and then I started to remember all the problems that I got correct. I pray and hope that each and everyone of you passed this exam. One thing to take away from this is when preparing for this exam, try to learn and under the fundamental priinciples and concepts and don't get up caught with particular problem types, because passing the exam is not about looking up problem types to match correct answers. It is about reading the problem and understanding what is being asked and being able to connect the correct principles and concepts to obtain the solution. The purpose of the reference guides such as Grafeo and Camara is to provide basic principles and concepts which will assist you in answering questions, not provide problems that match actual exam questions. That is why I constantly stress understanding of concepts and principles as oppose to only solving numerical problems.
  14. Camara's reference guide is good, but his practice exams are useless. Also you have to keep in mind that there is no one self contained reference book out there that has every thing you need for that exam. That is why you have several reference items. Try to make sure that you understand the main fundamental concepts and principles behind the solution to the problems and you should be fine. If you do this you should be able answer the majority of the problems correctly.
  15. I would assume that because this is a timed exam and you only have six minutes per problem, I cannot see there being any involved calculus problems such as having to integrate an indefinite integral using integration techniques such as partial fractions expansion coulped with trigonometric substitution. Even if they gave a problem that you had to integrate, I would imagine that it would be a simple definite integral in which you can solve using either the Casio FX-115 or the TI-36X Pro, which are both approved calculators.
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