Question
Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric coaxial cable, assuming all other parameters are the same?
Answer Options
- A) Foam dielectric coaxial cable has lower safe maximum operating voltage
- B) Foam dielectric coaxial cable has lower loss per unit of length
- C) Foam dielectric coaxial cable has higher velocity factor
- D) All these choices are correct
Correct Answer: D
Explanation
The performance of a coaxial cable is highly dependent on its dielectric material. Foam dielectric (air-filled bubbles in the plastic) is a technological improvement over solid plastic dielectric because the presence of air modifies the electrical and physical properties of the line in several beneficial ways.
Foam dielectric cable exhibits: lower loss per unit of length (due to reduced dielectric loss); higher velocity factor (since the dielectric constant of air is lower than plastic); but also lower safe maximum operating voltage (because the air bubbles can break down under high voltage). Therefore, All these choices are correct are significant differences between the two types of coaxial cable.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!