Electrical Inductors MCQ

Electrical Inductors MCQ Questions

• 1. Inductance is the property of an inductor that produces an opposition to any change in current.
• 2. The inductance of an iron-core coil decreases if ___.
• 3. A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is ___.
• 4. Electricity may be generated by a wire:
• 5. The electrical energy consumed by a coil is stored in the form of a magnetic field.
• 6. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field ___.
• 7. The term ‘self-inductance’ is used when a conductor has a voltage induced in it by:
• 8. What is magnetic flux?
• 9. Which type of device consists of a coil with a moveable iron core?
• 10. Opposition to current flow without the dissipation of energy is called ___.
• 11. What is the name of the part inside a relay that is moved by the action of the electromagnet?
• 12. A crack in the magnetic path of an inductor will result in ___.
• 13. The coefficient of coupling between two air core coils depends on _____.
• 14. What is the voltage across a coil when di/dt = 20 mA/µs and L = 8 µH?
• 15. The permeability of a core material is an indication of the ability of the material to establish a magnetic field.
• 16. Which of the following circuit element stores energy in the electromagnetic field?
• 17. A sine wave voltage is applied across an inductor, When the frequency of the voltage is decreased, the current is increased.
• 18. An open coil has ___.
• 19. The direction of induced e.m.f. can be found by which of the following law?
• 20. Mutual inductance between two magnetically coupled coils depends on: