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
1. Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.
- TRUE
- FALSE
2. The main features of a large-signal amplifier is the circuit's ________.
- power efficiency
- maximum power limitations
- impedance matching to the output device
- All of the above
3. The principal advantage(s) of BJTs over MOSFETs is (are) that
- voltage drop across the transistor is important.
- they are not as prone to ESD.
- both of the above
- none of the above
4. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings?
- N2/N1
- (N1/N2)2
- (N1/N2)1/3
- N1 × N2
5. Class ________ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input.
- A
- B
- C
- AB
6. Which type of power amplifier is biased for operation at less than 180º of the cycle?
- Class A
- Class B or AB
- Class C
- Class D
7. Class AB operation is ________ operation.
- similar to class A
- similar to class B
- similar to class C
- None of the above
8. The principal advantage(s) of MOSFETs over BJTs is (are)
- their biasing networks are simpler.
- their drive requirements are simpler.
- they can be connected in parallel for added drive capability.
- all of the above
9. Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?
- Digital multimeter
- Spectrum analyzer
- Oscilloscope
- Wave analyzer
10. In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?
- 0.5
- 0.636
- 0.707
- 1