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Remember a disproportionate amount of left field questions about VFDs. Anyone have a good "VFD explained" or white paper? I understand the application and use (in A/E world for motor control/speed on chillers, AHUs, etc) but didn't run into a lot of VFD type questions in practice tests. I know...

Felt ok about these types of problems, after going through NCEES #116 which involved a picture of a 3-legged magnetic circuit with legs A-B-C from left to right. Leg A is 3.0x10^-3 Wb, then they ask assuming linear magnetic properties, the approx flux (Wb) in Leg is mostly: In the picture they...

Failed in Oct 2010, homestretch for efforts for April test. I've run through the NCEES 2009 practice test to the point that i know the answer without thinking about from recognizing the question/format (good thing but...) Was wondering what the best resources after the NCEES are to go off of...