Circuits and Resonance Questions and Answers
Circuits and Resonance questions with answers are a major topic in electronics aptitude tests and engineering exams such as GATE, DRDO, and campus placements. These aptitude questions and answers focus on AC/DC circuits, impedance, phase difference, and resonance conditions. Understanding how current and voltage behave at resonance is essential for electrical and electronics engineers. Practicing circuit analysis and resonance problems with detailed solutions improves both theoretical knowledge and practical application. Access aptitude questions with solutions PDF to prepare effectively for technical and placement tests.
Circuits and Resonance
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50 questions
1. What is the time constant of an RC circuit with R=10kΩ and C=100μF?
- 0.1 second
- 1 second
- 10 seconds
- 100 seconds
2. In a series RLC circuit at resonance, the impedance is:
- Maximum
- Minimum
- Zero
- Infinite
3. The Q factor of a resonant circuit is defined as:
- Resonant frequency/Bandwidth
- Bandwidth/Resonant frequency
- 2π × Resonant frequency
- 1/(2π√LC)
4. What happens to the resonant frequency when capacitance increases in an LC circuit?
- Increases
- Decreases
- Remains same
- Becomes zero
5. In a parallel resonant circuit, at resonance the current is:
- Maximum
- Minimum
- Zero
- Infinite
6. The bandwidth of a resonant circuit is related to Q factor by:
- BW = fr × Q
- BW = fr/Q
- BW = Q/fr
- BW = 2πfrQ
7. What is the phase angle between voltage and current in a pure capacitive circuit?
- 0°
- 45°
- 90°
- 180°
8. The impedance of a series RL circuit is given by:
- R + XL
- R - XL
- √(R² + XL²)
- 1/√(R² + XL²)
9. In a half-wave rectifier, the ripple frequency is:
- Same as input frequency
- Twice input frequency
- Half input frequency
- Four times input frequency
10. What is the typical forward voltage drop across a silicon diode?
- 0.2V
- 0.7V
- 1.2V
- 2.0V