Technician exam question T6D07
Subelement T6, ELECTRONIC AND ELECTRICAL COMPONENTS· Group T6D
T6D07
Which of the following is commonly used as a visual indicator?
- A.LED (correct answer)
- B.FET
- C.Zener diode
- D.All these choices are correct
WhyAn LED is commonly used as a visual indicator. An LED is a simple, low-power, long-lasting light source commonly used as a visual indicator on radio equipment, panels, and instruments, answer A. An FET (B) is an amplifying or switching device and a Zener diode (C) is a voltage-reference component, neither one built to be looked at, so D, which depends on all three being visual indicators, is also wrong.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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