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The maximum efficiency of transformer coupled class A power amplifier is ____________

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The maximum efficiency of transformer coupled class A power amplifier is ____________

(a) 50%

(b) 25%

(c) 30%

(d) 5%

I got this question in unit test.

Query is from Class A Output Stage topic in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

1 Answer

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Right answer is (a) 50%

Easiest explanation: Using the transformer coupling technique, the efficiency of an amplifier can be enhanced to a great extent. The coupling transformer provides good impedance matching between the load and output, and it is the main reason behind the improved efficiency. Therefore, Its efficiency is 50%.

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