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
31. A turns ratio of 5 for a transformer implies:
- more primary turns than secondary turns
- more secondary current than primary current
- larger source impedance than load impedance
- more secondary turns than primary turns
32. A practical inductor
- has inductance
- has winding resistance
- has winding capacitance
- all of the above
33. When current in an inductor starts to change, it cannot react instantly due to:
- fixed coil resistance
- eddy current generation
- applied emf of the circuit
- the counter emf of the coil
34. What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?
- 10 seconds
- 8 seconds
- 4 seconds
- 2 seconds
35. A utility pole transformer used to supply a residential customer with two phases uses:
- two phases on the primary
- a center tap on the secondary
- a separate ground for each phase
- a small coefficient of coupling
36. When a coil collapses the induced circuit current will:
- be in the same direction
- go to zero
- aid counter emf buildup
- be in the opposite direction
37. When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is
- a lenz
- an ohm
- a farad
- a henry
38. If you wanted to decrease the inductance of a coil, you might increase the:
- number of turns
- permeability of the core
- spacing between turns
- area of the coil
39. The output phase for a transformer is:
- in phase with the input
- out of phase with the input
- dependent on the direction of the primary and secondary windings
- dependent on the frequency of the primary source
40. Opposition to current flow without the dissipation of energy is called:
- resistance
- inductive reactance
- counter emf
- impedance