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From my experience, I first submitted my PE exam paperwork on late August 2019 and received approval on mid November 2019. This is just my experience though, and others may have varying wait times for approval to take the exam...

So in this problem, the gate current signal first appears at alpha. The thyristor therefore first conducts anode current at alpha. Anode current is zero before alpha, but then it follows a sine wave curve until the anode current hits zero again at pi. The thyristor only conducts anode current...

This is the question about the SCR/thyristor, right? So basically, a couple of fundamentals about the SCR/thyristor: -They act similarly to a diode (current flows only in one direction), BUT they do not conduct until there is a voltage or current pulsed on the SCR's or thyristor's gate...

To be a bit more clear and accurate about 3-phase voltage drop, you have to be consistent about whether you are using line-to-neutral or line-to-line voltage drop. If you are doing line-to-neutral voltage drop, you have to calculate as a percentage of the source line-to-neutral voltage (e.g...

Congratulations!

They provide the code books (NEC, NESC, NFPA, etc.) in the CBT exam. You can search text... but not through Ctrl+F. Instead, they provide a text search tool (magnifying glass) on the left side of the screen. You then type what you are looking for in the search bar after clicking on the...

For parallel transformers and any parallel units, their available fault power in VA would be additive. I think that is what you are asking, and hope this helps.

The secondary is a delta. More specifically, it is a center-tapped delta. If you trace it out, starting from left to right: -Left: Phase G to Phase F -Middle: Phase F to Phase E. This one has the center tap to neutral N. -Right: Phase E to Phase G

I believe the author of Cram for Exam said that there was a mistake on this question. I remember this was discussed in another topic on this board. I'll see if I can find that topic thread for you. EDIT - Found the thread. Please see this link...

Not necessarily... it can lead or lag by 30 degrees. The typical U.S. standard is that the higher voltage side leads the lower voltage side by 30 degrees.

I myself haven't heard of open delta for both 1-phase and 3-phase loads... But I have definitely seen center-tapped deltas for serving both 1-phase and 3-phase loads.

I believe the main reason that choice D is considered true here is because the core magnetizing reactance Xm is much larger than the no-load resistance Rc. So then if you divide Vp/jXm, the resulting no-load current's angle will lag Vp by 90 degrees.

The neutral conductor will only carry the third-harmonic currents. This is because: Positive-sequence (and negative-sequence) balanced currents have the same magnitude but are displaced by 120 degrees from each other. Due to the 120-degree displacement, they add up to 0 at the neutral...

See the attachments.

To further elaborate on this: Positive-sequence rotation (ABC rotation) is typically usually assumed if the problem does not state anything about phase sequence. Positive angular rotation is counterclockwise from the horizontal. The typical reference is: Phase A: 0 degrees Phase B: -120...

To start off without giving too much away, the reference PDF provided for the CBT pales in comparison and is much lighter (much less information) than the binder that I created originally for the paper-and-pencil exam. As an example, a lot of people in this forum (including myself) have said...

Off the top of my head: Zach Stone's Electrical PE Review and Justin Kauwale's Engineering Pro Guides have a good amount of PT, CT, and protection practice questions. They both have both practice exams and individual sections covering protection.

There was another topic on the Power Exam forum about this that you may want to check out: https://engineerboards.com/threads/corner-grounded-delta-system-question.36261/

Yeah, sometimes you really do need to carefully read the problem statement and interpret it correctly. In this case, I guess one way to look at it is that a 3-phase source can be used to power 1-phase and/or 3-phase loads...

kris702: I think Zach's diagram was just an example and does not necessarily reflect the designations given in problem 111. In any case, an equivalent 1-phase or per-phase circuit analysis is done by using the line-to-neutral versions of the sources and loads, regardless of how the sources and...