Inductors Questions and Answers
Inductors are essential components in electronics circuits that store energy in a magnetic field when electrical current flows through them. Understanding inductors is crucial for candidates preparing for GATE, ISRO, DRDO, and ECE placement exams, where aptitude questions and answers related to inductors frequently appear. These questions often test concepts like inductive reactance, energy storage, mutual inductance, and RL circuit behavior. Mastering these fundamentals helps in analyzing real-world circuit performance. This section provides electronics questions with answers and explanations on inductors, enabling learners to strengthen their concepts and prepare effectively for competitive exams. Practice these aptitude questions with detailed solutions to enhance your technical understanding and speed.
Inductors
1. The electrical energy consumed by a coil is stored in the form of:
- an electrical field
- a force field
- an electrostatic field
- a magnetic field
2. What is magnetic flux?
- the number of lines of force in webers
- the number of lines of force in maxwells
- the number of lines of force in teslas
- the number of lines of force in flux density
3. As current travels within a conductor:
- the magnetic field aids the current
- a magnetic field is developed around it
- the wire tries to point north
- an electrostatic field opposes the current
4. What type of device consists of a coil with a moveable iron core?
- solenoid
- reed switch
- relay
- armature
5. What is hysteresis?
- lead between cause and effect
- lag between cause and effect
- lead between voltage and current
- lag between voltage and current
6. In a purely inductive circuit,
- current leads voltage by 90°
- voltage lags current by 90°
- voltage leads current by 90°
- voltage and current are in phase (0°)
7. A series RL filter circuit with an output across the inductor will result in what type of filtering?
- passing of the higher frequencies
- passing of the lower frequencies
- blocking of the higher frequencies
- blocking of a certain range of frequencies
8. On a schematic, dashed lines between two vertical coils usually mean the transformer has:
- an air core
- an iron core
- a nonmetallic core
- a ferrite core
9. Faraday's law states that the:
- direction of the induced voltage produces an opposition
- direction of an induced current produces an aiding effect
- emf depends on the rate of cutting flux
- emf is related to the direction of the current
10. A henry value divided by a circuit resistive value provides the:
- counter emf value
- induced voltage amplitude
- rise or decay time constant
- quality factor of the coil