Why should soldered joints not be used in lightning protection ground connections?
The correct answer is A: A soldered joint will likely be destroyed by the heat of a lightning strike. Why soldered joints should not be used in lightning protection ground connections is that a soldered joint will likely be destroyed by the heat of a lightning strike. Lightning carries enormous energy and heat that can melt solder, destroying the connection. For amateur radio operators, this is a critical safety concern. Understanding this helps ensure proper lightning protection.
Exam Tip
No soldered joints in lightning protection = heat of lightning strike destroys solder. Think 'S'oldered = 'S'truck by lightning = 'S'older 'S'melts. Lightning carries enormous heat that can melt solder, destroying the connection. Not flux, not dielectric constant - just heat destruction.
Memory Aid
"No soldered joints in lightning protection = heat of lightning strike destroys solder. Think 'S'oldered = 'S'truck by lightning = 'S'older 'S'melts. Lightning carries enormous heat that can melt solder. Use mechanical connections for lightning protection."
Real-World Application
You install lightning protection ground connections. You use mechanical connections (clamps, bolts) instead of soldered joints. If lightning strikes, the enormous heat can melt solder (solder melts at relatively low temperatures), destroying the connection. Mechanical connections can withstand lightning better.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Solder flux doesn't prevent low conductivity - modern fluxes don't significantly affect conductivity. Flux isn't the issue.
Option C: Incorrect. Solder doesn't have too high a dielectric constant - solder is conductive, not a dielectric. Dielectric constant isn't the issue.
Option D: Incorrect. Since B and C are not correct, 'all of the above' cannot be correct. Only the heat destruction is the issue.
题目解析
The correct answer is A: A soldered joint will likely be destroyed by the heat of a lightning strike. Why soldered joints should not be used in lightning protection ground connections is that a soldered joint will likely be destroyed by the heat of a lightning strike. Lightning carries enormous energy and heat that can melt solder, destroying the connection. For amateur radio operators, this is a critical safety concern. Understanding this helps ensure proper lightning protection.
考试技巧
No soldered joints in lightning protection = heat of lightning strike destroys solder. Think 'S'oldered = 'S'truck by lightning = 'S'older 'S'melts. Lightning carries enormous heat that can melt solder, destroying the connection. Not flux, not dielectric constant - just heat destruction.
记忆口诀
No soldered joints in lightning protection = heat of lightning strike destroys solder. Think 'S'oldered = 'S'truck by lightning = 'S'older 'S'melts. Lightning carries enormous heat that can melt solder. Use mechanical connections for lightning protection.
实际应用示例
You install lightning protection ground connections. You use mechanical connections (clamps, bolts) instead of soldered joints. If lightning strikes, the enormous heat can melt solder (solder melts at relatively low temperatures), destroying the connection. Mechanical connections can withstand lightning better.
错误选项分析
Option B: Incorrect. Solder flux doesn't prevent low conductivity - modern fluxes don't significantly affect conductivity. Flux isn't the issue. Option C: Incorrect. Solder doesn't have too high a dielectric constant - solder is conductive, not a dielectric. Dielectric constant isn't the issue. Option D: Incorrect. Since B and C are not correct, 'all of the above' cannot be correct. Only the heat destruction is the issue.
知识点
Soldered joints, Lightning protection, Lightning strike heat, Ground connections
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.