What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF?
The correct answer is C: Inductance. What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF is inductance. Electrolytic capacitors have significant lead inductance, making them unsuitable for RF. For amateur radio operators, this is important for component selection. Understanding this helps when choosing capacitors for RF circuits.
Exam Tip
Electrolytic capacitor unsuitable at RF = inductance parasitic characteristic. Think 'E'lectrolytic 'C'apacitor = 'E'xcessive 'C'onductor inductance. Electrolytic capacitors have significant lead inductance, making them unsuitable for RF. Not skin effect, not shunt capacitance, not dielectric leakage - just inductance.
Memory Aid
"Electrolytic capacitor unsuitable at RF = inductance parasitic characteristic. Think 'E'lectrolytic 'C'apacitor = 'I'nductance. Electrolytic capacitors have significant lead inductance, making them unsuitable for RF. Important for component selection."
Real-World Application
Electrolytic capacitors: They're unsuitable for use at RF because of inductance. The long leads and construction of electrolytic capacitors create significant inductance, which becomes problematic at RF frequencies. This is the parasitic characteristic - inductance.
Key Concepts
Why Other Options Are Wrong
Option A (Skin effect): Incorrect. Skin effect isn't the parasitic characteristic - inductance is. Skin effect isn't the cause.
Option B (Shunt capacitance): Incorrect. Shunt capacitance isn't the parasitic characteristic - inductance is. Shunt capacitance isn't the cause.
Option D (Dielectric leakage): Incorrect. Dielectric leakage isn't the parasitic characteristic - inductance is. Dielectric leakage isn't the cause.
题目解析
The correct answer is C: Inductance. What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF is inductance. Electrolytic capacitors have significant lead inductance, making them unsuitable for RF. For amateur radio operators, this is important for component selection. Understanding this helps when choosing capacitors for RF circuits.
考试技巧
Electrolytic capacitor unsuitable at RF = inductance parasitic characteristic. Think 'E'lectrolytic 'C'apacitor = 'E'xcessive 'C'onductor inductance. Electrolytic capacitors have significant lead inductance, making them unsuitable for RF. Not skin effect, not shunt capacitance, not dielectric leakage - just inductance.
记忆口诀
Electrolytic capacitor unsuitable at RF = inductance parasitic characteristic. Think 'E'lectrolytic 'C'apacitor = 'I'nductance. Electrolytic capacitors have significant lead inductance, making them unsuitable for RF. Important for component selection.
实际应用示例
Electrolytic capacitors: They're unsuitable for use at RF because of inductance. The long leads and construction of electrolytic capacitors create significant inductance, which becomes problematic at RF frequencies. This is the parasitic characteristic - inductance.
错误选项分析
Option A (Skin effect): Incorrect. Skin effect isn't the parasitic characteristic - inductance is. Skin effect isn't the cause. Option B (Shunt capacitance): Incorrect. Shunt capacitance isn't the parasitic characteristic - inductance is. Shunt capacitance isn't the cause. Option D (Dielectric leakage): Incorrect. Dielectric leakage isn't the parasitic characteristic - inductance is. Dielectric leakage isn't the cause.
知识点
Parasitic characteristic, Electrolytic capacitors, Unsuitable for use at RF, Inductance
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.