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
41. The maximum efficiency of a class B amplifier is ________ percent.
- 50
- 25
- 70
- 79
42. A class ________ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180º of the input cycle.
- A
- B
- C
- AB
45. A class C amplifier has a tank circuit in the output. The amplifier is conducting only 28°. The output voltage is
- 0 V.
- a dc value equal to VCC.
- a sine wave.
- a square wave with a frequency determined by the tank.
48. In a class B push-pull amplifier, crossover distortion occurs when both transistors are off and the input signal voltage must exceed VBE before a transistor conducts.
- TRUE
- FALSE
50. Class A amplifiers operate in the active region of the load line all of the time.
- TRUE
- FALSE