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Which of the following technique is used to increase the efficiency of class A amplifier?

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Which of the following technique is used to increase the efficiency of class A amplifier?

(a) By using FET

(b) By using PNP transistor

(c) By using matched transformers as load

(d) By using potentiometers as load

The question was posed to me in unit test.

Question is taken from Class A Large Signal Amplifiers in division Large Signal Amplifiers of Electronic Devices & Circuits

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The correct answer is (c) By using matched transformers as load

Best explanation: We can increase the efficiency of class A amplifier by using load matching concept, hence a pair of matched transformer can be used as load which in turn increases the efficiency.

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