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I just realized that this book has a formula for buck/boost transformer. :)   And I just figured out that the secondary current and load current is equal for both configurations. Thanks!

Why we did not consider the current flowing at the common/combined winding which is: Ic=25kVA/360V = 69.4A ???

Hi,  could anyone explain to me why the answer is 75kVA and not 100kVA? thanks,

Hi, I'm just going to use this thread for some of my Cram Vol.1 practice exam questions instead of creating a new one. For problem #2,  If the efficiency lost is 20%, is that mean that the charging efficiency will be 80%?. And that being said, should the answer be Time of charge=...

Hi @Chattaneer PE, what if the connection will be High side wye and Low side delta? will the result for positive and negative sequence current change? Will it become: Ia1(wye) =Ia1 <-30 Ia2(wye) = Ia2 <30 Iao=0 ??? I know the result will still be the same (1/square root of 3) since...

I believe letter C is still a proper connection. It still protect the load. MOVs are also used in DC applications ( electronics and semiconductors).

I was confused by these before as well.  This is correct in terms of batteries. But this is opposite in terms of diodes(PN junction devices), or any electronic devices such as BJT. anode is positive (holes) and cathode is negative(electrons) . Thus, electrons flows from cathode to the anode for...

@Chattaneer PE, are you from Florida as well? in what testing location you took the PE power exam here?

Took the Cram practice test #1 today with timed. Got 60/80. 😑 would like ask some questions in some of my mistakes. ☹️

Just be careful guys. I think inserting sheets to the plastic cover binder is not a good idea. The papers should be bounded/attached to the binder. That's my perception, atleast. :)  

@Chattaneer PE, I just purchased these books from someone but they are 2018 edition. do you know if the latest edition has a similar problems with the 2018 one? Also, do you recommend bringing these practice exam books to the exam? Or just leave them and use these just for practice during the...

Will the answer be the same if diode D2 will be open and not shorted?

@MEtoEE, thank you for the explanation. If the “coefficient of utilization“ will be on the choices, would you think it will the answer too?.

What would you answer for this kind of qualitative problem and why?

So it looks like it would fall to the Grounding section. Thanks for the info. 

I am also wondering if A and C are both correct answers. Could someone please confirm?  thank you. 

Could anyone explain to me or refer me to any reference material in regards to this problem? not sure if this is a lightning protection or NESC topic. Thank you

What I typically do is to put  sticky flags inside the body of the pages(not on the edges of the reference binder) and then write the subsection or topic so that I can easily see it.  i do also have two separate binders but the other one is all sample exams so that if I see a problem that is...

@SparkyBill, I used the index that’s similar to @ItsStudyTime!.

Took the graffeo practice exam at the end of his book earlier today and got 74/80 with timed test. I finished 2 hrs in the morning session and 2.5 hrs in the afternoon session. I was thinking that the problems in the actual exam is much harder( but I can’t really tell because this is my first...