What is a common use for point-contact diodes?
The correct answer is C: As an RF detector. What is a common use for point-contact diodes is as an RF detector. Point-contact diodes are commonly used as RF detectors. For amateur radio operators, this is important for component knowledge. Understanding this helps when using point-contact diodes.
Exam Tip
Point-contact diode common use = RF detector. Think 'P'oint-'C'ontact = 'P'oint 'C'rystal detector (RF). Point-contact diodes are commonly used as RF detectors. Not constant current, not constant voltage, not high-voltage rectifier - just RF detector.
Memory Aid
"Point-contact diode common use = RF detector. Think 'P'oint-'C'ontact = 'R'F 'D'etector. Point-contact diodes are commonly used as RF detectors. Important for component knowledge."
Real-World Application
Point-contact diodes: A common use is as an RF detector. Point-contact diodes were historically used in crystal radio receivers and are still used in some RF detector applications. This is the use - RF detector.
Key Concepts
Why Other Options Are Wrong
Option A (As a constant current source): Incorrect. Constant current source isn't the use - point-contact diodes are used as RF detectors. Constant current isn't the use.
Option B (As a constant voltage source): Incorrect. Constant voltage source isn't the use - point-contact diodes are used as RF detectors. Constant voltage isn't the use.
Option D (As a high-voltage rectifier): Incorrect. High-voltage rectifier isn't the use - point-contact diodes are used as RF detectors. High-voltage rectifier isn't the use.
题目解析
The correct answer is C: As an RF detector. What is a common use for point-contact diodes is as an RF detector. Point-contact diodes are commonly used as RF detectors. For amateur radio operators, this is important for component knowledge. Understanding this helps when using point-contact diodes.
考试技巧
Point-contact diode common use = RF detector. Think 'P'oint-'C'ontact = 'P'oint 'C'rystal detector (RF). Point-contact diodes are commonly used as RF detectors. Not constant current, not constant voltage, not high-voltage rectifier - just RF detector.
记忆口诀
Point-contact diode common use = RF detector. Think 'P'oint-'C'ontact = 'R'F 'D'etector. Point-contact diodes are commonly used as RF detectors. Important for component knowledge.
实际应用示例
Point-contact diodes: A common use is as an RF detector. Point-contact diodes were historically used in crystal radio receivers and are still used in some RF detector applications. This is the use - RF detector.
错误选项分析
Option A (As a constant current source): Incorrect. Constant current source isn't the use - point-contact diodes are used as RF detectors. Constant current isn't the use. Option B (As a constant voltage source): Incorrect. Constant voltage source isn't the use - point-contact diodes are used as RF detectors. Constant voltage isn't the use. Option D (As a high-voltage rectifier): Incorrect. High-voltage rectifier isn't the use - point-contact diodes are used as RF detectors. High-voltage rectifier isn't the use.
知识点
Common use, Point-contact diodes, RF detector
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.