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
41. With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current?
- 1500 mA
- 200 mA
- 167 mA
- 150 mA
42. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
- The coil windings must be the same.
- coil 1
- The coil ratio is too small.
- coil 2
43. When the transformer secondary is not loaded:
- secondary voltage increases
- no secondary current flows
- no secondary voltage is present
- secondary current increases
44. What is the total inductance of a 5 H and a 100 mH coil connected in parallel?
- 4.76 mH
- 33.3 mH
- 98.0 mH
- 150.0 mH
45. A transformer is used:
- to couple electric energy from one dc circuit to another
- to couple electric energy from an ac circuit to a dc circuit
- to couple electric energy from a dc circuit to an ac circuit
- to couple electric energy from one ac circuit to another
46. Which of the following is NOT one of the three major types of fixed inductor?
- air core
- ferrite core
- magnesium core
- iron core
47. What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?
- 500 ohms
- 1000 ohms
- 1414 ohms
- 2000 ohms
49. You could decrease the time constant of an RL circuit by
- adding a resistor in parallel with the circuit resistance
- adding an inductor in series with the circuit inductance
- decreasing the amplitude of the input voltage
- exchanging the position of the resistor and inductor in the circuit
50. Indication of transformer primary and secondary voltage relationships is accomplished by:
- color-coded wires
- dot notation
- black, rather than gray, casings
- winding ratios