# Electromagnetic Induction

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

Question 1 of 25

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

Question 2 of 25

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

Question 3 of 25

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

Question 4 of 25

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

Question 5 of 25

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

Question 6 of 25

7. State Lenz Law

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

Question 8 of 25

9. 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 9 of 25

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

Question 10 of 25

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

Question 11 of 25

12. State Faradays Law of Electromagnetic induction?

Question 12 of 25

13. What is the main assumption in TURNS RULE?

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

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

Question 15 of 25

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

Question 16 of 25

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

Question 17 of 25

18. Define transformers?

Question 18 of 25

19. 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 19 of 25

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

Question 20 of 25

21. Give the formula of Turns RATIO

Question 21 of 25

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

Question 22 of 25

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

Question 23 of 25

24. 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 24 of 25

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

Question 25 of 25