RedRaider2020
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- Nov 30, 2020
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If you're using referencing time in your sinusoid equation then you have to use the max value otherwise you'll use RMS.
I apologize. I had you confused with someone else on here who had just started studying.Okay so it doesn't matter so the equation they give should work as shown regardless of if it's wye or delta. I guess I have a hard time understanding obtaining a line to neutral voltage in a delta but still having to multiply it by the square root of 3 to get the line to line voltage. I guess I just need to remember that and not let it trip me up
I'm not sure if that answered my question here, unless by "HP conversion" you're implying that what I said about 3 phase was right? Also I don't know what you mean by "minutes part of the RPM if it's underneath the HP." I'm guessing I've just never seen what you've referencing before
Alright, maybe that's just not a thing, which is possible.
Okay good, that's what I thought. I've been mixing that stuff up so much since I started studying I find it hard to trust myself on it anymore. I'll make note of that now that I have confirmation
Alright, so just to make sure, unless it gives the sinusoid equation of the voltage with respect to time you just use the rms voltage it gives? Like a transmission line with a certain line to line voltage, you'd just use the line to line voltage in that equation
Little late for that since I take the exam on the 12th. While I feel like reading the book front to back was primarily a waste of time the two exams from his Power Sample Exams book seem good to me and just looking up specific information got me good results for the manual itself. Maybe about 10 to 15 were questions I don't expect to see anything about on the exam but out of 160 questions that's not that many. I do plan on using ProGuides and Zach Stone's stuff from here to the test though
The HP conversion does work on 3 phase or single phase. I was just talking about using the 33,000 HP to (ft-lbf/min) conversion for the torque equation. Ws is in RPM so you have to cancel out the min. I don't know if that's applicable to your question. It's just something that has tripped me up before.
The main place that Max vs RMS Vs Average voltage comes up is the power converters, or possibly for inductor and capacitor calculations. I think most other equations in the handbook use RMS. That's just off the top of my head though. Yes most transmission line questions will give you L-L voltages that are RMS.