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
21. Electromagnetic induction is the generation of:
- electricity from magnetism
- electricity from electricity
- magnetism from electricity
- magnetism from magnetism
22. Inductance is:
- directly proportional to the length of the coil
- directly proportional to the number of turns on the coil
- inversely proportional to the cross-sectional area of the coil
- inversely proportional to the permeability
23. Current will cause a magnetic field in a conductor as follows:
- An ac current causes a fixed polarity magnetic field.
- A dc current causes a fixed polarity magnetic field.
- A dc current causes an alternating magnetic field.
- An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
24. During a current change, the ability of a conductor to produce counter emf within itself is called:
- back emf
- self-induction
- a henry
- impedance
25. When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:
- multiple-tapped secondary
- center-tapped secondary
- multiple winding secondary
- single winding secondary
26. What will happen when an inductor's magnetic field collapses?
- Current will double.
- Voltage will be induced.
- A new field will expand.
- Counter emf will be high.
27. With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?
- dc
- short time-duration pulses
- exponential-shaped pulses
- only a phase shift
28. When a magnet enters a coil and a voltage is induced, the process is known as:
- an alternation
- self-inductance
- counter emf
- flux linkage
29. What term is used to describe the action of magnetic flux from one circuit that cuts across the conductors of another circuit?
- self-inductance
- rectification
- mutual inductance
- magnetism
30. Reactance in an inductive circuit will:
- increase with frequency
- decrease with frequency
- be independent from frequency
- depend on the value of XC