Extra exam question E7B02
Subelement E7, PRACTICAL CIRCUITS· Group E7B
What is a Class D amplifier?
- A.An amplifier that uses switching technology to achieve high efficiency (correct answer)
- B.A low power amplifier that uses a differential amplifier for improved linearity
- C.An amplifier that uses drift-mode FETs for high efficiency
- D.An amplifier biased to be relatively free from distortion
WhyA Class D amplifier uses switching technology to achieve high efficiency. A Class D amplifier uses switching technology, rapidly turning its output devices fully on or fully off rather than operating them in a linear region, which minimizes power dissipated in the devices themselves and achieves high efficiency, answer A. It isn't a low-power differential-amplifier design, doesn't use "drift-mode" FETs (not a standard term), and isn't defined by being biased for low distortion, that describes Class A instead.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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