As a conductor’s diameter increases, what is the effect on its electrical length?
The correct answer is D: It increases. As a conductor's diameter increases, what is the effect on its electrical length is that it increases. Larger diameter conductors have longer electrical length due to reduced velocity factor. For amateur radio operators, this is important for antenna design. Understanding this helps when designing antennas.
Exam Tip
Conductor diameter increase = electrical length increases. Think 'D'iameter 'I'ncrease = 'D'ifferent 'I'nductance (longer electrical length). Larger diameter conductors have longer electrical length due to reduced velocity factor. Not no effect, not random, not decrease - just increases.
Memory Aid
"Conductor diameter increase = electrical length increases. Think 'D'iameter 'I'ncrease = 'I'ncreased electrical length. Larger diameter conductors have longer electrical length due to reduced velocity factor. Important for antenna design."
Real-World Application
As a conductor's diameter increases: The effect on its electrical length is that it increases. Larger diameter conductors have reduced velocity factor, making them electrically longer for the same physical length. This is the effect - electrical length increases.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Thickness has no effect isn't correct - larger diameter increases electrical length. No effect is wrong.
Option B: Incorrect. It varies randomly isn't correct - larger diameter increases electrical length. Random variation is wrong.
Option C: Incorrect. It decreases isn't correct - larger diameter increases electrical length. Decrease is wrong.
题目解析
The correct answer is D: It increases. As a conductor's diameter increases, what is the effect on its electrical length is that it increases. Larger diameter conductors have longer electrical length due to reduced velocity factor. For amateur radio operators, this is important for antenna design. Understanding this helps when designing antennas.
考试技巧
Conductor diameter increase = electrical length increases. Think 'D'iameter 'I'ncrease = 'D'ifferent 'I'nductance (longer electrical length). Larger diameter conductors have longer electrical length due to reduced velocity factor. Not no effect, not random, not decrease - just increases.
记忆口诀
Conductor diameter increase = electrical length increases. Think 'D'iameter 'I'ncrease = 'I'ncreased electrical length. Larger diameter conductors have longer electrical length due to reduced velocity factor. Important for antenna design.
实际应用示例
As a conductor's diameter increases: The effect on its electrical length is that it increases. Larger diameter conductors have reduced velocity factor, making them electrically longer for the same physical length. This is the effect - electrical length increases.
错误选项分析
Option A: Incorrect. Thickness has no effect isn't correct - larger diameter increases electrical length. No effect is wrong. Option B: Incorrect. It varies randomly isn't correct - larger diameter increases electrical length. Random variation is wrong. Option C: Incorrect. It decreases isn't correct - larger diameter increases electrical length. Decrease is wrong.
知识点
Conductor diameter increases, Effect on electrical length, It increases, Electrical length
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.