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Circuit Theory Question Paper

Circuit Theory

Course:Bachelor Of Education Science In Physics And Chemistry

Institution: Moi University question papers

Exam Year:2010

CIRCUIT THEORY
REVIEW QUESTIONS.

1. Why is the strength of a dielectric expressed in terms of the voltage gradient of an electric field rather than the total potential difference?

2. Why must the ratio between the charge on a given pair of insulated conductors and the potential difference between them be a constant?

3. Define dielectric absorption.

4. Define the term capacitance in terms of Q and V.

5. Define the term capacitor in terms of Q and V.

6. Why can we define capacitance as that property of an electric circuit that opposes any change in voltage across the circuit?

7. Why does the spacing between two parallel plates have an effect on their capacitance?

8. Why does the voltage applied to two parallel plates not have any defau on their capacitance?

9. Why is it possible to have capacitance between two parallel plates when the space between then is evacuated?

10. Why does the presence of an insulating material between the parallel plates increase their capacitance as compared with that of the same plates in a vacuum?

11. Distinguish between the absolute permittivity and the relative permittivity of a given dielectric.

12. Define the farad in terms of flux density and the intensity of the electric field in the dielectric between the plates.

13. Why is it possible to define the dielectric constant of a given insulating material as the ratio between the capacitance of a pair of parallel plates with that material as a dielectric and the same parallel plates with air as a dielectric?

14. When two capacitors are connected in series, one plate of each has no electrical connection to any voltage source. How is it possible for these capacitors to become charged?

15. Why must capacitors in series all take the same charge?

16. Some of the older electrolytic capacitors packaged in aluminium cans have been known to explode when connected across a dc voltage source such that the insulated terminal is negative with respect to the can. Explain what happens.

17. Explain why a motor-starting capacitor consisting of two electolytic capacitors connected in series opposing can be used safely in an ac circuit.

Circuit Theory Question Paper

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