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Extra exam question E7B04

Subelement E7, PRACTICAL CIRCUITS· Group E7B

E7B04

What is the operating point of a Class A common emitter amplifier?

  • A.Approximately halfway between saturation and cutoff (correct answer)
  • B.Approximately halfway between the emitter voltage and the base voltage
  • C.At a point where the bias resistor equals the load resistor
  • D.At a point where the load line intersects the zero bias current curve

WhyThe operating point of a Class A common emitter amplifier is approximately halfway between saturation and cutoff. A Class A common emitter amplifier is biased so its operating point sits approximately halfway between saturation and cutoff on its load line, letting the full signal swing symmetrically without clipping on either the positive or negative half of the cycle, answer A. It isn't set halfway between emitter and base voltage, isn't defined by the bias resistor equaling the load resistor, and doesn't sit where the load line crosses the zero-bias-current curve, that point is cutoff itself, not the Class A operating point.

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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