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
11. What is the maximum temperature rating for silicon power transistors?
- 50º to 80º
- 100º to 110º
- 150º to 200º
- 250º to 300º
12. What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?
- 90%
- 78.5%
- 50%
- 25%
13. Which class of amplifier operates in the linear region for only a small part of the input cycle?
- A
- B
- C
- AB
15. Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º.
- 25 W
- 30 W
- 35 W
- 40 W
16. How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?
- 0
- 1
- 2
- 3
17. What transformer turns ratio is required to match an 8- speaker load so that the effective load resistance seen at the primary is 12.8 k?
- 20:1
- 40:1
- 50:1
- 60:1
18. Which of the following is (are) power amplifiers?
- Class A
- Class B or AB
- Class C or D
- All of the above
19. Quiescent power is the power dissipation of a transistor
- with no signal input.
- with no load.
- under full load.
- along the dc load line.
20. Which of the power amplifiers is not intended primarily for large-signal or power amplification?
- Class A
- Class B or AB
- Class C
- Class D