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Circuit Theory Question Paper

Circuit Theory

Course:Bachelor Of Engineering In Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2010

CIRCUIT THEORY
REVIEW QUESTIONS

1. On what basis can we make the assumption that the total reluctance of a long air-core coil is approximately equal to the reluctance of the non-magnetic core of the coil itself?

2. Describe a torroid-type winding on a magnetic circuit. What is its advantage?

3. What causes leakage flux to occur in magnetic circuits? State two means of reducing leakage flux in magnetic circuit design.

4. What characteristic of magnetic circuits allows us to calculate the total magnetomotive force required in a circuit made us of several different sections?

5. Many practical magnetic circuits contain an air has in the form of a sheet of plastic or brass. Why do such materials constitute air gaps?

6. In an all-iron magnetic circuit, the relationship between the applied magnetomotive force and the resulting total magnetic flux is quite nonlinear. By purposely including an air has in a magnetic circuit, there is a more linear relationship between applied mmf and total flux. Explain.

7. What causes fringing of the magnetic lines of force in an air gap?

8. Why does the tractive force increase as an iron car is placed closer to an electromagnet with a constant current through its exciting coils?

9. Mechanical work is required to pull a soft-iron bar away from a U-shaped permanent magnet. Where does this energy go?

Circuit Theory Question Paper

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