Recent content by dzdave00

The wording of this question does not really make sense. In the real world, to go from an ungrounded wye source to a corner grounded delta, I believe you would need a transformer. Your thinking is correct if the source was grounded wye. Seems like the point of the question was to show that on...

I don't have the book, but if you scan the problem to pdf and post here, I'm sure folks would be happy to help. :p10940623:

Va/Ra would give you the armature current, not the rotor current. The rotor current is tougher to visualize. I do not like how Camara did the solution on this. It is unclear and lazy and the notation used to describe what value is being solved for is unclear. On top of that, the reference...

There are several threads already here which talk about people's recommendations on study books/references. What specific area of electrical will you be taking?

Don't take this the wrong way, but you need to drastically change the way you study for the test. Doing the same type of preparation is not going to help as you have probably noticed. If you have not taken a preparation course before, that is a good change to try in your studying habits.

Oh, this is a different problem than the one I was thinking of, my apologies. Part A of this problem is solving for the (steady state condition) current flowing in the circuit with the switch in position A. The proper equation to use is: I(t) = Io*e(-t/T) + (Vbatt/R)*(1-e(-t/T) where T=L/R...

If the topics are not listed in the current NCEES exam specs, there will not be any questions on those topice. These topics were included in past exams during the breadth sections, but the breadth section no longer exists.

Hello, I do not have the book with me right now, but I will give it my best: 1.) Chapter 27, problem 7: My experience with problems where there is a question on whether to use peak values or RMS values is if they want peak values, they will specifically ask for peak values. Otherwise I always...

In my opinion, the usefulness of that book will be limited in the new format, because there are only around 6 of the 60+ chapters that deal with power. I thought it was somewhat useful in the old exam format morning session, but I don't think it will help a whole lot now...they may have a new...

They skipped a couple steps and made it more confusing (as if they needed to do that!) Start with I_actual = I_pu*I _base for naming convention, say Z_pu = ZT1pu+ZLpu I_pu = V_pu/Z_pu V_pu = 1 (I assume this is the case, I do not have the question in front of me) therefore, I_pu = 1/Z_pu...

The voltage drop formula from IEEE 141 works for this problem: Vd = V + IRcos@ + IXsin@ - sqrt[V^2-(IXcos@-IRsin@)^2] where: Vd = L-N volt drop V = source voltage (277 V) I = current (400 Amps) R = AC Resistance from NEC Table 9 (Ohms to Neutral) (.00725 ohms) X = AC Reactance from NEC...

Ok, this is problem 529 in the NCEES sample exam. Sorry, the 129 number threw me off. I ended up solving it like the solution in the book, applying the power factor to the current, but not to the R and X values. In my mind, I don't see the R and X of the wire changing with power factor. It...

I took the exam in October 08 and I don't think there were any questions on cogeneration. And looking at the exam format for power in April 09, there is no mention of cogeneration. http://www.ncees.org/exams/professional/El...cifications.pdf

Sorry, but I don't have the sample exam. If you post the question in more detail, I can be of more help.

Thanks! I could not find any review classes locally either. I think the closest one was in Chicago, which is way to far to go. Best of luck to you in April.