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Ece 152: Electrical Engineering Materials Question Paper

Ece 152: Electrical Engineering Materials

Course:Bachelor Of Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2007

ECE 152: ELECTRICAL ENGINEERING MATERIALS

1. Draw a diagram of the magnetic field around a horseshoe-shaped permanent magnet.

2. With reference to the characteristics of magnetic lines of force, show why a mail is attracted to either pole of a horseshoe-shaped permanent magnet.

3. Show with sketches how it is possible to determine the direction of the current in an electric conductor with the aid of a compass needle.

4. Why is the flux density of a magnetic field greater in the center of a current-carrying solenoid than around a straight wire carrying the same current?

5. How is the magnitude of the weber established?

6. Define the term reluctance.

7. What is the distinction between magnetomotive force and magnetizing force?

8. Define the term permeability.

9. Account for the upper knee on the BH curve of ferromagnetic materials.

10. Draw a BH curve for aluminium.

11. What is the distinction differential and incremental permeability?

12. Compare permanent and temporary magnets in terms of coercive force.

13. Define the term hysterisis.

14. Laminating the iron core of a transformer greatly reduces the eddy-current losses. What effect does the laminating process have on hysterisis losses? Explain.

15. Some magnetic circuits consist of powdered iron pressed into form with a ceramic binder. Compare such a core with a solide core of the same type of iron in terms of
a. Permeability
b. Hysterisis
c. Eddy current

Ece 152: Electrical Engineering Materials Question Paper

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