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
61. What happens when moving expanding lines of force encounter a conductor?
- Current increases.
- Voltage is induced.
- Resistance is reduced.
- Power is increased.
62. Fixed transformers have:
- a center-tapped secondary
- multiple windings
- turns ratios that cannot be changed
- a multiple-tapped secondary
63. Which of the following represents a true equivalent of an inductor?
- An inductance in series with a resistance and a capacitance
- A capacitance in parallel with the series combination of a resistance and an inductance
- An inductance in parallel with the series combination of a resistance and a capacitance
- The only quality a real inductor has is inductance.
64. The time required for one weber of flux to cut a conductor and produce one volt is:
- one revolution
- one second
- one millisecond
- four revolutions
65. A voltage is induced in a transformer secondary winding by the action of the:
- secondary magnetic field
- primary turns ratio
- primary magnetic field
- secondary counter emf
66. What is electromagnetism?
- the magnetic field generated around a conductor when a current passes through it
- the magnetic field generated in a conductor by an external voltage
- the voltage caused by a magnetic field in a conductor
- the current generated by an external magnetic field
67. Counter emf or induced voltage is:
- inversely proportional to the change in current
- directly proportional to the change in time
- directly proportional to the inductance in henrys
- inversely proportional to the inductance in henrys
68. What are the properties that determine the inductance of a coil?
- Length of wire, number of turns, type of core material, length of core
- Number of turns, type of wire, length of core, and cross-sectional area of core
- Type of core material, number of turns, cross-sectional area of core, and length of core
- Type of core material, type of wire, number of turns, and cross-sectional area of core
69. An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like
- a short
- an open
- a resistor
- a voltage source
70. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 komega.gif, and a 1 komega.gif resistor are in series with a source?
- 0.1 degrees
- 9.0 degrees
- 61.0 degrees
- 81.0 degrees