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
Showing 10 of
50 questions
31. What is the typical efficiency of class B push-pull amplifier?
- 25%
- 50%
- 78.5%
- 95%
32. The main advantage of negative feedback in amplifiers is:
- Increases gain
- Reduces bandwidth
- Increases distortion
- Improves stability
33. In a Hartley oscillator, the feedback is obtained from:
- Capacitive divider
- Inductive divider
- Resistive divider
- Direct coupling
34. What is cross-over distortion in class B amplifiers?
- High frequency distortion
- Zero-crossing distortion
- Thermal distortion
- Phase distortion
35. The Q-point in transistor amplifiers is set to:
- AC operating point
- DC operating point
- Peak current point
- Breakdown point
36. In RC phase shift oscillator, the phase shift per RC section is:
- 30°
- 45°
- 60°
- 90°
37. What is the main use of a Schmitt trigger?
- Amplification
- Voltage regulation
- Waveform shaping
- Power amplification
38. The Barkhausen criterion for oscillations is:
- Aβ = 0
- Aβ = 1
- Aβ ≥ 1 with 0° phase
- Aβ ≤ 1 with 180° phase
39. In a differential amplifier, CMRR stands for:
- Common Mode Rejection Ratio
- Common Mode Resistance Ratio
- Current Mode Rejection Ratio
- Capacitive Mode Rejection Ratio
40. What is the purpose of a heat sink in power amplifiers?
- Increase gain
- Reduce noise
- Dissipate heat
- Store energy