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What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?

/ Electrical Engineering Mcqs, Transistor Audio Power Amplifiers / By
What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?

A. 20%
B. 80%
C. 40%
D. 50%