Extra exam question E6A07
Subelement E6, CIRCUIT COMPONENTS· Group E6A
Which of the following indicates that a silicon NPN junction transistor is biased on?
- A.Base-to-emitter resistance of approximately 6 ohms to 7 ohms
- B.Base-to-emitter resistance of approximately 0.6 ohms to 0.7 ohms
- C.Base-to-emitter voltage of approximately 6 volts to 7 volts
- D.Base-to-emitter voltage of approximately 0.6 volts to 0.7 volts (correct answer)
WhyA silicon NPN junction transistor biased on shows a base-to-emitter voltage of approximately 0.6 to 0.7 volts. A silicon NPN transistor's base-to-emitter junction is a forward-biased PN junction, and like any silicon diode junction, it drops approximately 0.6 to 0.7 volts when conducting, a telltale sign the transistor is biased on, answer D. The resistance-based options don't describe how a biased junction is actually characterized, and the 6-to-7-volt figures are an order of magnitude too high for a silicon junction's forward drop.
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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