Power Amplifiers Questions and Answers
The Power Amplifiers questions with answers section covers important electronics concepts such as Class A, B, AB, and C amplifiers, efficiency, distortion, and transistor operation. These electronics aptitude questions and answers are frequently asked in GATE, BEL, DRDO, and campus placement exams. Understanding how power amplifiers boost signal strength is essential for ECE and EE students. Each question is explained with diagrams and theory, helping you prepare thoroughly for both academic and technical interviews in electronics-based roles.
Power Amplifiers
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55 questions
21. By how much does the output signal vary for a class AB power amplifier?
- 360º
- 180º
- Between 180º and 360º
- Less than 180º
22. Which type of amplifier uses pulse (digital) signals in its operation?
- Class A
- Class B or AB
- Class C
- Class D
23. Which of the push-pull amplifiers is presently the most popular form of the class B power amplifier?
- Quasi-complementary
- Transformer-coupled
- Complementary-symmetry
- None of the above
24. Calculate the harmonic distortion component for an output signal having a fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V.
- 3.83%
- 38.3%
- 8.33%
- 83.3%
25. Which amplifier is commonly used as a frequency multiplier?
- class A
- class B
- class C
- all of the above
26. A class B amplifier operates in the linear region for
- slightly more than 180° of the input cycle.
- 360° of the input cycle.
- slightly less than 180° of the input cycle.
- much less than 180° of the input cycle.
27. Which of the following instruments displays the harmonics of a distorted signal?
- Digital multimeter
- Spectrum analyzer
- Oscilloscope
- Wave analyzer
28. Calculate the efficiency of a transformer-coupled class A amplifier for a supply of 15 V and an output of V(p) = 10 V.
- 25%
- 33.3%
- 50%
- 78.5%
29. ________ amplifiers primarily provide sufficient power to an output load to drive a speaker from a few watts to tens of watts.
- Small-signal
- Power
- None of the above
30. You have an application for a power amplifier to operate on FM radio frequencies. The most likely choice would be a ________ amplifier.
- class A
- class B
- class C
- class AB