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When no signal is applied, the approximate collector efficiency of class A power amplifier is ____________

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in Electronic Devices & Circuits by (272k points)
When no signal is applied, the approximate collector efficiency of class A power amplifier is ____________

(a) 25%

(b) 10%

(c) 0%

(d) 50%

I got this question in unit test.

This is a very interesting question from Class A Output Stage in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Correct answer is (c) 0%

The explanation: The efficiency of a class A amplifier is dependent upon the input signal. The relation is direct. Therefore, with no input signal applied(i.e. input signal= 0); the efficiency will be equal to zero.

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