Why is it important to keep lead lengths short for components used in circuits for VHF and above?
The correct answer is B: To minimize inductive reactance. Why is it important to keep lead lengths short for components used in circuits for VHF and above is to minimize inductive reactance. Short leads reduce inductance, which is important at VHF/UHF. For amateur radio operators, this is important for RF circuit design. Understanding this helps when building VHF/UHF circuits.
Exam Tip
Short leads for VHF+ = minimize inductive reactance. Think 'S'hort 'L'eads = 'S'mall 'L'ead inductance. Short leads reduce inductance, which is important at VHF/UHF. Not thermal time constant, not component lifetime - just minimize inductive reactance.
Memory Aid
"Short leads for VHF+ = minimize inductive reactance. Think 'S'hort 'L'eads = 'L'ess inductance. Short leads reduce inductance, which is important at VHF/UHF. Important for RF circuit design."
Real-World Application
Keeping lead lengths short for components used in circuits for VHF and above: It's important to minimize inductive reactance. At VHF/UHF frequencies, even small lead lengths can have significant inductive reactance, affecting circuit performance. This is the reason - minimize inductive reactance.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Increase thermal time constant isn't the reason - short leads minimize inductive reactance. Thermal time constant isn't the reason.
Option C: Incorrect. Maintain component lifetime isn't the reason - short leads minimize inductive reactance. Component lifetime isn't the reason.
Option D: Incorrect. Since A and C are not correct, 'all of the above' cannot be correct. Only minimizing inductive reactance is the reason.
题目解析
The correct answer is B: To minimize inductive reactance. Why is it important to keep lead lengths short for components used in circuits for VHF and above is to minimize inductive reactance. Short leads reduce inductance, which is important at VHF/UHF. For amateur radio operators, this is important for RF circuit design. Understanding this helps when building VHF/UHF circuits.
考试技巧
Short leads for VHF+ = minimize inductive reactance. Think 'S'hort 'L'eads = 'S'mall 'L'ead inductance. Short leads reduce inductance, which is important at VHF/UHF. Not thermal time constant, not component lifetime - just minimize inductive reactance.
记忆口诀
Short leads for VHF+ = minimize inductive reactance. Think 'S'hort 'L'eads = 'L'ess inductance. Short leads reduce inductance, which is important at VHF/UHF. Important for RF circuit design.
实际应用示例
Keeping lead lengths short for components used in circuits for VHF and above: It's important to minimize inductive reactance. At VHF/UHF frequencies, even small lead lengths can have significant inductive reactance, affecting circuit performance. This is the reason - minimize inductive reactance.
错误选项分析
Option A: Incorrect. Increase thermal time constant isn't the reason - short leads minimize inductive reactance. Thermal time constant isn't the reason. Option C: Incorrect. Maintain component lifetime isn't the reason - short leads minimize inductive reactance. Component lifetime isn't the reason. Option D: Incorrect. Since A and C are not correct, 'all of the above' cannot be correct. Only minimizing inductive reactance is the reason.
知识点
Lead lengths short, Components, Circuits for VHF and above, Minimize inductive reactance
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.