Extra exam question E6A08
Subelement E6, CIRCUIT COMPONENTS· Group E6A
What is the term for the frequency at which the grounded-base current gain of a bipolar junction transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
- A.Corner frequency
- B.Alpha rejection frequency
- C.Beta cutoff frequency
- D.Alpha cutoff frequency (correct answer)
WhyAlpha cutoff frequency is the frequency at which a bipolar junction transistor's grounded-base current gain has decreased to 0.7 of its value at 1 kHz. Alpha cutoff frequency is the specific term for the frequency at which a bipolar transistor's grounded-base (common-base) current gain has dropped to 0.7 of its value at 1 kHz, a standard high-frequency figure of merit for the device, answer D. "Corner frequency" and "alpha rejection frequency" aren't the real terms used here, and beta cutoff frequency describes the equivalent figure for common-emitter (beta) gain, not common-base (alpha) gain.
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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