The maximum efficiency of transformer coupled class A power amplifier is _______________?
Correct answer: B. 50%
- A. 30%
- B. 50%
- C. 80%
- D. 45%
Explanation
A transformer-coupled class A amplifier can achieve 50% maximum efficiency because the transformer isolates the DC supply from the load and permits a larger symmetrical AC swing. A resistance-loaded class A stage is limited to 25%.
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