Electromagnetic Induction

1. How do you increase the induced E.M.F or current for both a.c and d.c generators?

Question 1 of 25

2. State Faradays Law of Electromagnetic induction?

Question 2 of 25

3. Which of the following is not among the energy losses experienced in a transformer?

Question 3 of 25

4. Mention the factors which affect the magnitude of induced E.M.F

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5. State Lenz Law

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6. What is the main assumption in TURNS RULE?

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7. What is the power input for the secondary source in a transformer?

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8. In a step down transformer secondary current Is is greater than the primary current Ip?

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9. Give the formula of Turns RATIO

Question 9 of 25

10. Whenever there is relative motion between a magnetic field and a conductor then an induced current resulting from an induced E.M.F flows in the conductor. True or False?

Question 10 of 25

11. How do you reduce eddy currents in the core of transformers?

Question 11 of 25

12. How do you reduce the heating effect caused in the coils of a transformer which increases electrical resistance?

Question 12 of 25

13. Give the important factors necessary for an induced E.M.F to flow in a conductor

Question 13 of 25

14. Mutual induction occurs when a changing current in one coil induces current in another placed close to it?

Question 14 of 25

15. Which of the following is NOT among the application of electromagnetic induction?

Question 15 of 25

16. Define transformers?

Question 16 of 25

17. In a step up transformer primary current Ip is greater than the secondary current Is?

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18. The efficiency of a transformer = (power output)/(power input) x 100. True or False?

Question 18 of 25

19. Which of the following statement is INCORRECT about step up transformers?

Question 19 of 25

20. The equation of Turns Rule shows that: (secondary voltage )/(primary voltage ) = (no.of secondary turns )/(no.of primary turns) = (Vs )/(Vp ) = (Ns )/(Np ). True or False?

Question 20 of 25

21. How do you minimize hysteresis loss in a transformer core?

Question 21 of 25

22. What is the power input for the primary source in a transformer?

Question 22 of 25

23. Mention the type of energy loss in a transformer experienced when the magnetic flux produced by the primary coil is not all linked with the secondary coil, hence reducing the induced E.M.F in the secondary?

Question 23 of 25

24. Which of the following statements is CORRECT about step down transformers?

Question 24 of 25

25. Mention the ways in which you can increase the mutual induced E.M.F on a secondary coil

Question 25 of 25