ESA Certified Alarm Technician Practice Exam

What is the main advantage of coaxial cable?

1. High flexibility

2. Long distance transmission

3. Lower installation cost

4. Resistance to interference

The correct answer is: Resistance to interference

The main advantage of coaxial cable is its resistance to interference. Coaxial cables are designed with a central conductor surrounded by an insulating layer, a metallic shield, and an outer insulating layer. This structure helps to protect the inner conductor from external electromagnetic interference, as well as reducing signal loss and maintaining signal integrity over long distances. This resistance to interference makes coaxial cable particularly valuable in environments where electromagnetic noise is present, such as in commercial buildings or industrial settings. The shielding provided by the cable minimizes the impact of nearby electronic devices, radio transmissions, and environmental factors that could otherwise distort the signal. Although coaxial cable does have some flexibility, long-distance capabilities, and can be cost-effective, these characteristics are not its primary advantage. The unique construction that offers resistance to interference is what makes coaxial cable a preferred choice in many telecommunications and audio/video applications.