Technician exam question T7C09
Subelement T7, PRACTICAL CIRCUITS· Group T7C
T7C09
Which of the following causes failure of coaxial cables?
- A.Moisture contamination (correct answer)
- B.Solder flux contamination
- C.Rapid fluctuation in transmitter output power
- D.Operation at 100% duty cycle for an extended period
WhyMoisture contamination can cause failure of coaxial cables. Moisture that works its way into a coaxial cable's dielectric or connectors degrades its insulation and raises loss, and over time can corrode the conductors, making it a common cause of coax failure, answer A. Solder flux residue (B), fluctuating transmitter power (C), and sustained high-duty-cycle operation (D) aren't typical failure mechanisms for the cable itself.
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.
Related questions
- T7C01What is the primary purpose of a dummy load?
- T7C02Which of the following is used to determine if an antenna is resonant at the desired operating frequency?
- T7C03What does a typical RF dummy load consist of?
- T7C04What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?
- T7C05Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?