Inductor Viva Interview Questions with Answers

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Question-1. What is an inductor?

Answer-1: An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.[1] An inductor typically consists of an insulated wire wound into a coil.

Question-2. Define inductance and state its unit of measurement.

Answer-2: Inductance is the property of an inductor that opposes any change in the flow of current and is measured in henries (H).

Question-3. How does the inductance of a coil change when the number of turns increases?

Answer-3: The inductance of a coil increases with the number of turns because it increases the magnetic flux linking the coil, thereby increasing the induced voltage.

Question-4. What is the formula for calculating the inductance of an inductor?

Answer-4: The formula is L = N?/I, where L is the inductance, N is the number of turns, ? is the magnetic flux, and I is the current.

Question-5. What are the factors that affect the inductance of an inductor?

Answer-5: The factors include the number of turns, the core material, and the physical dimensions of the inductor.

Question-6. What is the purpose of a core in an inductor?

Answer-6: The core material in an inductor helps to increase the inductance by concentrating the magnetic field.

Question-7. What is self-inductance?

Answer-7: Self-inductance is the property of an inductor to induce a voltage in itself when the current changes.

Question-8. What is mutual inductance?

Answer-8: Mutual inductance is the property of two inductors to induce a voltage in each other when the current in one changes.

Question-9. How do inductors behave in DC circuits?

Answer-9: In DC circuits, an inductor behaves like a short circuit when fully charged and an open circuit when fully discharged.

Question-10. What is the time constant of an RL circuit?

Answer-10: The time constant of an RL circuit is the time required for the current in the inductor to reach approximately 63.2% of its final value when a DC voltage is applied.

Question-11. What is the energy stored in an inductor and how is it calculated?

Answer-11: The energy stored in an inductor is given by the formula: E = (1/2)LI^{2}, where E is the energy stored, L is the inductance, and I is the current flowing through the inductor.

Question-12. Different Types of Inductors?

Answer-12: Depending on the type of material used, inductors can be classified as:

1. Iron Core Inductor

2. Air Core Inductor

3. Iron Powder Inductor

4. Ferrite Core Inductor

Question-13. What is the role of inductors in filtering circuits?

Answer-13: In circuits, inductors are commonly used in filtering circuits to block or pass certain frequencies of electrical signals.

Question-14. Differentiate between an ideal and a real inductor.

Answer-14: An ideal inductor has no resistance and no capacitance, while a real inductor has some resistance and may also have some capacitance.

Question-15. How does the core material affect the performance of an inductor?

Answer-15: The core material affects the performance of an inductor by influencing its inductance, saturation level, and resistance.

Question-16. What are the factors affecting the inductance of a coil?

Answer-16: Factors affecting the inductance of a coil include the number of turns, the cross-sectional area of the coil, the length of the coil, and the presence of a core material.

Question-17. What are the applications of inductors in electronic circuits?

Answer-17: Inductors are used in electronic circuits for various applications such as filtering, energy storage, signal processing, and impedance matching.

Question-18. How does mutual inductance influence the behavior of coupled inductors?

Answer-18: Mutual inductance affects the behavior of coupled inductors by allowing energy transfer between the coils without physical connection.

Question-19. What is the purpose of using ferrite cores in inductors?

Answer-19: Ferrite cores are used in inductors to increase their inductance, reduce interference, and improve performance at high frequencies.

Question-20. What is the concept of "back EMF" in inductors?

Answer-20: Back EMF refers to the voltage generated in an inductor that opposes the change in current and is responsible for the "kickback" effect.

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