final exam - EE321 Final Exam Spring 2004 Name Student ID...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
EE321. Final Exam Spring 2004 Name: Student ID: Instructions: Work ALL Problems. Show your work. Each problem is worth 25 pts. There was a physics student named bright. He thought a lot about light. He went out one day in the usual way and came back the previous night. – Garrison Keillor
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Problem 1 – MEC Modeling Starting with the definition of flux, and the definition of MMF drop, derive Ohm’s law for linear magnetic material. In particular, show that Φ = R F b a , , where ( ) A l R µ / = where b a F , is the MMF drop from node a to node b, R is reluctance, Φ is the flux into node A, l is the length from node a to node b, A is the cross sectional area of the path, and µ is the absolute permeability. Problem 2 – Energy Conversion Consider a magnetic system with the following flux linkage equations 2 1 2 2 1 1 4 3 5 i i i i + = + = λ λ Initially, both currents are zero. If first winding 1 is energized to 1 A, and then winding 2 is energized from 0 to 2 A, what is the co-energy? Now, consider the situation if winding 1 goes from 0 to 1 A (linearly in time) and winding 2 goes from 0 to 2 A at the same time (again, as a linear function of time).
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern