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For a Class B amplifier, the utilized load power is 300W and the Dc power is 500W, find efficiency.

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For a Class B amplifier, the utilized load power is 300W and the Dc power is 500W, find efficiency.

(a) 30%

(b) 60%

(c) 90%

(d) 100%

I had been asked this question in an interview.

This key question is from Class B Amplifiers topic in portion Power Amplifiers of Electronic Devices & Circuits

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Right answer is (b) 60%

To explain I would say: Efficiency=ac power/dc power

Efficiency=300/500 = 3/5 = 0.6.

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