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What is the efficiency of Class A amplifiers?

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What is the efficiency of Class A amplifiers?

(a) 30 or less

(b) 50 or less

(c) 100

(d) 75

I got this question in an interview for internship.

This intriguing question comes from Class A Large Signal Amplifiers topic in division Large Signal Amplifiers of Electronic Devices & Circuits

1 Answer

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The correct choice is (a) 30 or less

To explain: Since in Class A amplifiers distortion is more and as it requires tuned circuit as load, the efficiency is very low.

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