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Extra exam question E7B01

Subelement E7, PRACTICAL CIRCUITS· Group E7B

E7B01

For what portion of the signal cycle does each active element in a push-pull, Class AB amplifier conduct?

  • A.More than 180 degrees but less than 360 degrees (correct answer)
  • B.Exactly 180 degrees
  • C.The entire cycle
  • D.Less than 180 degrees

WhyEach active element in a push-pull Class AB amplifier conducts for more than 180 degrees but less than 360 degrees of the signal cycle. In a Class AB push-pull amplifier, each active element conducts for more than half the signal cycle (more than 180 degrees) but less than the full cycle (360 degrees), a compromise between Class B's exactly-half-cycle conduction and Class A's full-cycle conduction, reducing crossover distortion while still improving on Class A's efficiency, answer A. Exactly 180 degrees describes Class B, the entire cycle describes Class A, and less than 180 degrees describes Class C.

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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