Ham Radio General Class Practice Test

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Which of the following is a characteristic of a Class A amplifier?

Low standby power
High efficiency
No need for bias
Low distortion

The correct answer is: Low distortion

A Class A amplifier is known for its ability to produce high-fidelity audio with minimal distortion, making it particularly suitable for applications where sound quality is paramount. This is due to its configuration, where the output transistor conducts throughout the entire cycle of the input signal, allowing for a faithful reproduction of the input without introducing significant harmonic distortion. The continuous conduction ensures that the amplifier operates within the most linear region, leading to a smooth output waveform that closely resembles the input. While it is true that Class A amplifiers have lower efficiency compared to other types (making them less suitable for battery-powered devices or portable applications), their low distortion is a primary characteristic that audio engineers and enthusiasts value. This combination of low distortion and high linearity is crucial in producing clear and accurate sound reproduction, which is why Class A amplifiers are often preferred in high-end audio equipment.