NCEES Errors

[EEpowerOK]

On the latest version, copyright 2011, does anyone know of any errors in the answers?

 

[knight1fox3]

You didn't specify for which discipline you are inquiring about. However, I believe there was an errata released for the version prior to the latest 2011 edition. According to this link though, it would seem any errors pertaining to any of the elect. & computer exams have been corrected in the 2011 version since no corresponding erratas are listed.

EDIT: Some previous discussion on this http://engineerboards.com/index.php?showtopic=13705'>here.

 

[Redskinsdb21]

best thing is to post any doubts you have on a specific question and let us look over your doubts and try to make it clear for you

 

[EEpowerOK]

EE Power version from NCEES practice exam.

 

[EEpowerOK]

best thing is to post any doubts you have on a specific question and let us look over your doubts and try to make it clear for you

Question 512, in the answer they take the Ch 9 x r value and divide by 2, why? It says there are 2 sets of conductors with a total length of 500'. So it should be 500/1000 which it is. Don't know where the divide by 2 came from. Most of these they multiply by 2 due to a 1 phase when using the Table 9.

 

[knight1fox3]

best thing is to post any doubts you have on a specific question and let us look over your doubts and try to make it clear for you

Question 512, in the answer they take the Ch 9 x r value and divide by 2, why? It says there are 2 sets of conductors with a total length of 500'. So it should be 500/1000 which it is. Don't know where the divide by 2 came from. Most of these they multiply by 2 due to a 1 phase when using the Table 9.

Have a look at this thread and see if that helps at all.

It's worth noting that a good number of problems have been discussed in previous threads on this board. A quick search may save you some time in finding the answer(s) you need. However, if you still have trouble, by all means post your question.

 

[EEpowerOK]

Here is a complex question for you all,

given V(t)= 100 cos(377t+40 degrees) and I(t)=10 cos(377t-32 degrees)

what is the pf?

 

[knight1fox3]

Do you have an idea on how to start it? I'll give you a few pointers.

You can convert V and I to phasor quantities. Find the apparent power (S) which = VI*

pf = cos θ

 

[EEpowerOK]

How about 40 - (-32) = 72 degrees

then cos 72 = pf

?