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Electrical Engineering - Electromagnetic Induction MCQs
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Electrical Engineering - Electromagnetic Induction MCQs
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25 Questions

1. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
2. Lenz’s law is a consequence of the law of conservation of
3. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
4. A laminated iron core has reduced eddy-current losses because
5. The co-efficient of coupling between two air core coils depends on
6. Mutually inductance between two magnetically-coupled coils depends on
7. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unitWeber turns.
8. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
9. The magnitude of the induced e.m.f. in a conductor depends on the
10. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
11. A moving magnetic field will produce the same effect as a conductor that is moving.
12. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
13. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
14. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly
15. The polarity of the induced voltage can be determined by using the left-hand generator rule.
16. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
17. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.
18. Which circuit element(s) will oppose the change in circuit current ?
19. Higher the self-inductance of a coil,
20. Which of the following circuit elements will oppose the change in circuit current ?
21. Two 300 uH coils in series without mutual coupling have a total inductance of
22. Air-core coils are practically free from
23. As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
24. An open coil has
25. A crack in the magnetic path of an inductor will result in

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