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dayrongarcia i plug in the numbers and i see you have to half and I see how your second choose could be 20 poles and 48 poles just as your third chose could be 30 and 72 ?

Dayrongarcia, I think it finally click !!!! You start out with your 2 poles at 25hz which is 4.80 pole at 60hz but since its only goes by even pairs of poles you use 4 poles and so on while getting your speed RPM for each which then can find your frequency until you get to the lowest speed...

Thank You !!! So the 10 poles is the Max you can go with out going over the the 25Hz right!

Thank you JB66money I understand the setup but not how you get 10 pole I'm stuck at that part

sorry MyBeardAndMe I mess this one up can you please clarify this one better for me

MyBeardAndMe thank you but I stuck for some reason on how to find the pole # at 25hz ? not given the speed I assume the rpm at 25hz is 25*60= 1500 rpm and then you divide that by 120f = 120*60HZ=7200 is the the path ? not sure but when I divided by i get the pole # close to 10 and then I...

Hi I tried working problem 3.1 in Grainger but not sure how they came up with the correct number of pole I have attached the problem if someone can figure out how they obtain the pole # ? I understand the formula but not how they came up with the # of poles. thank you

thank you Katylied you gave me so good advice and help me out with a few problem too especialy from grainger thank you

thank you all for the reference there were somethings I needed to plug in and the information you all provide help now i will just continue repetitive studying of problems then go back to theory then back again to problem for the rest of the month back n forth

I just wanted to know if anybody has thoughts on how to approach the engineering economics sample problem and is there a sample problem from NCEES using engineering economics I thought there was one example but I can’t seem to find one in the sample test I just been doing the sample from...

I have my one note book tabbed with all the area of study base on the NCEES outline with different topic base related to the NCEES sample test, spin, CI and Graffeo sample test. Then I have one note book I call my theory section which I put the different topics and theory on them broken down for...

it gives you word topics that can put you in the aea to find the article sometime the index doesn’t have the key word you’re looking for and sometime Tom henry doesn’t but it sure helps highlights a lot of areas quickly in most case . I use it as a second reference but you still have to be...

I don't get to use the NEC book often so when I purchase the tom henry and the CI drill book it help me get more familiar

I find the Tom Henry Key Word Index as good aid to get to some of the NEC article quick It not a 100% effective but for a large amount of NEC question it does help me get to the article faster anybody have some opinions on this ? Is anybody else using Tom Henry’s?

Hi Koz I don’t have the problem in front of me but what I tried do is look at the phasor diagram for a generator remember Ei voltage for a synchronous generator is Ei=Vt+jXI but you have look at the phasor diagram but it also depends on the leading or lagging power factor of jXaIa. Sorry I hope...

I was going over Ncees sample power problem 104 and the thing that becomes a sticking point with me is making sure I use the correct ampacities table from the NEC. So can someone explain to me if my approach to this problem is ok? Now every time I go over this problem I tend to use table...

Yes I understand the steps you showed and what I gather from your steps and what the CI problem is stating, There are two key point one in order to keep a balance load the KVA has to be the same for both transformer and you have to have different turn ratio with tap setting in order for...

Thank you I understand what you are saying and what the question was explaining now

Any information someone can add to this topic

I'm still a little confused when it comes to this question in the CI book. When I look in Wildi Book on parallel transformer he state two points for load sharing between two transformers 1. The primary and secondary voltages should be the same 2. The per unit impedance should be the same. Now I...