Extra exam question E6B04
Subelement E6, CIRCUIT COMPONENTS· Group E6B
What type of semiconductor device is designed for use as a voltage-controlled capacitor?
- A.Varactor diode (correct answer)
- B.Tunnel diode
- C.Silicon-controlled rectifier
- D.Zener diode
WhyA varactor diode is the semiconductor device designed for use as a voltage-controlled capacitor. A varactor diode is specifically designed to be used as a voltage-controlled capacitor, its junction capacitance changing predictably as the reverse bias voltage across it is varied, answer A. A tunnel diode is known for its negative resistance region, a silicon-controlled rectifier is a latching power-switching device, and a Zener diode is a voltage reference, none of them is built for this voltage-controlled capacitance function.
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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