Technician exam question T6D03
Subelement T6, ELECTRONIC AND ELECTRICAL COMPONENTS· Group T6D
Which of the following is a reason to use shielded wire?
- A.To decrease the resistance of DC power connections
- B.To increase the current carrying capability of the wire
- C.To prevent coupling of unwanted signals to or from the wire (correct answer)
- D.To reduce receiver overload
WhyShielded wire is used to prevent coupling of unwanted signals to or from the wire. Shielded wire surrounds its conductor with a grounded metallic layer that blocks RF energy from coupling into or out of the wire, preventing unwanted signals from either radiating from the wire or being picked up by it, answer C. Shielding doesn't lower DC resistance (A) or raise current capacity (B), those depend on the conductor's size, and "reducing receiver overload" (D) describes a different problem, an overly strong signal overwhelming a receiver's front end, not what shielding a wire specifically addresses.
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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