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What is the value of the maximum efficiency of the class B amplifier?

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What is the value of the maximum efficiency of the class B amplifier?

(a) 25%

(b) 35%

(c) 35% to 50%

(d) 50% to 70%

I had been asked this question by my school principal while I was bunking the class.

Query is from Class B Amplifiers topic in chapter Power Amplifiers of Electronic Devices & Circuits

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The correct answer is (d) 50% to 70%

Explanation: Class B amplifiers are more efficient compare to the class A amplifier because of good protection against noise effects.

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