What is the value of maximum efficiency of a transformer coupled class-A power amplifier?

What is the value of maximum efficiency of a transformer coupled class-A power amplifier?

  1. a) 25 %
  2. b) 30 %
  3. c) 50%
  4. d) 78%

From the BCS Technical Cadre (ICT) October 2025 – 49th BCS Written (Special) (BPSC) exam, question 79 of 106.

More from this paper