Question

Class B linear amplifiers have maximum power efficiency of

(a) 50%

(b) 75%

(c) 78.5%

(d) None of the mentioned

The question was posed to me during a job interview.

This interesting question is from M-ary Modulation and Amplifiers in division Modulation and Coding Trade-off of Digital Communications

Answer 1

The correct choice is (c) 78.5%

To elaborate: Class B linear amplifiers have maximum power efficiency of 78.5%.