What is the purpose of neutralizing an amplifier?
The correct answer is B: To eliminate self-oscillations. The purpose of neutralizing an amplifier is to eliminate self-oscillations. Neutralization cancels feedback that causes unwanted oscillations. For amateur radio operators, this is essential for stable amplifier operation. Understanding this helps when tuning amplifiers.
Exam Tip
Neutralization purpose = eliminate self-oscillations. Think 'N'eutralization = 'N'ulls 'O'scillations. Neutralization cancels feedback that causes unwanted oscillations. Not modulation limit, not standby control, not frequency stability - just eliminate oscillations.
Memory Aid
"Neutralization purpose = eliminate self-oscillations. Think 'N'eutralization = 'N'ulls 'O'scillations. Neutralization cancels feedback that causes unwanted oscillations. Essential for stable amplifier operation."
Real-World Application
An amplifier is self-oscillating due to feedback. You add neutralization - a circuit that cancels the feedback, eliminating the unwanted oscillations. Neutralization is essential for stable amplifier operation. Without it, amplifiers can oscillate and cause interference.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Neutralization doesn't limit modulation index - that's done by ALC and audio levels, not neutralization. Modulation isn't the purpose.
Option C: Incorrect. Neutralization doesn't cut off amplifier during standby - that's done by keying or power control, not neutralization. Standby control isn't the purpose.
Option D: Incorrect. Neutralization doesn't keep carrier on frequency - that's done by oscillator stability, not neutralization. Frequency stability isn't the purpose.
题目解析
The correct answer is B: To eliminate self-oscillations. The purpose of neutralizing an amplifier is to eliminate self-oscillations. Neutralization cancels feedback that causes unwanted oscillations. For amateur radio operators, this is essential for stable amplifier operation. Understanding this helps when tuning amplifiers.
考试技巧
Neutralization purpose = eliminate self-oscillations. Think 'N'eutralization = 'N'ulls 'O'scillations. Neutralization cancels feedback that causes unwanted oscillations. Not modulation limit, not standby control, not frequency stability - just eliminate oscillations.
记忆口诀
Neutralization purpose = eliminate self-oscillations. Think 'N'eutralization = 'N'ulls 'O'scillations. Neutralization cancels feedback that causes unwanted oscillations. Essential for stable amplifier operation.
实际应用示例
An amplifier is self-oscillating due to feedback. You add neutralization - a circuit that cancels the feedback, eliminating the unwanted oscillations. Neutralization is essential for stable amplifier operation. Without it, amplifiers can oscillate and cause interference.
错误选项分析
Option A: Incorrect. Neutralization doesn't limit modulation index - that's done by ALC and audio levels, not neutralization. Modulation isn't the purpose. Option C: Incorrect. Neutralization doesn't cut off amplifier during standby - that's done by keying or power control, not neutralization. Standby control isn't the purpose. Option D: Incorrect. Neutralization doesn't keep carrier on frequency - that's done by oscillator stability, not neutralization. Frequency stability isn't the purpose.
知识点
Neutralization, Self-oscillations, Amplifier stability, Feedback cancellation
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.