A class-A transformer coupled, transistor power amplifier is required to deliver a power output of 10 Watts. The maximum power rating of the transistor should be less than
- A. 5 W
- B. 10 W
- C. 20 W
- D. 40 W
Answer: C. 20 W
Explanation: For class-A transformer-coupled, efficiency is at most 50 %, so the transistor must dissipate 2×Po = 20 W.