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The maximum collector efficiency of class B operation is ________

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The maximum collector efficiency of class B operation is ________

(a) 50%

(b) 25%

(c) 30%

(d) 5%

I got this question in examination.

This key question is from Class B Output Stage in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Correct answer is (d) 5%

The explanation is: Since the active device is switched off for half the input cycle, the active device dissipates less power and hence the efficiency is improved. Theoretical maximum efficiency of Class B power amplifier is 78.5%.

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