ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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Which of the following is the most common cause for failure of coaxial cables?

Moisture contamination
Physical damage
Improper installation
Excessive heat

The correct answer is: Moisture contamination

Moisture contamination is indeed a significant factor leading to the failure of coaxial cables. Coaxial cables are designed to transmit signals with minimal loss and interference, and when moisture seeps into the cable, it can disrupt these signals. Water can cause corrosion of the inner conductor and damage the dielectric material, leading to signal degradation and potential complete failure of the cable. Furthermore, in outdoor applications, coaxial cables are often exposed to various environmental conditions. If the connectors or cable insulation are not properly sealed, moisture can enter and compromise the performance of the cable. This moisture can result in increased attenuation, erratic signals, and ultimately an electrical short. In contrast, while physical damage, improper installation, and excessive heat can all cause coaxial cable failures, moisture contamination is frequently cited as the leading issue, especially in outdoor installations. Proper sealing, protecting against water intrusion, and using high-quality cable and connectors can help mitigate these moisture-related risks.