What is the most common configuration of an optoisolator or optocoupler?
The correct answer is D: An LED and a phototransistor. What is the most common configuration of an optoisolator or optocoupler is an LED and a phototransistor. Most optoisolators use LED + phototransistor. For amateur radio operators, this is important for optoelectronics knowledge. Understanding this helps when using optoisolators.
Exam Tip
Most common optoisolator configuration = LED and phototransistor. Think 'O'ptoisolator = 'L'ED + 'P'hototransistor. Most optoisolators use LED + phototransistor. Not lens/photomultiplier, not FM laser, not AM laser - just LED and phototransistor.
Memory Aid
"Most common optoisolator configuration = LED and phototransistor. Think 'O'ptoisolator = 'L'ED + 'P'hototransistor. Most optoisolators use LED + phototransistor. Important for optoelectronics knowledge."
Real-World Application
An optoisolator or optocoupler: The most common configuration is an LED and a phototransistor. The LED emits light, and the phototransistor detects it, providing electrical isolation. This is the configuration - LED and phototransistor.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Lens and photomultiplier isn't common - LED and phototransistor is. Lens/photomultiplier isn't common.
Option B: Incorrect. Frequency-modulated helium-neon laser isn't common - LED and phototransistor is. FM laser isn't common.
Option C: Incorrect. Amplitude-modulated helium-neon laser isn't common - LED and phototransistor is. AM laser isn't common.
题目解析
The correct answer is D: An LED and a phototransistor. What is the most common configuration of an optoisolator or optocoupler is an LED and a phototransistor. Most optoisolators use LED + phototransistor. For amateur radio operators, this is important for optoelectronics knowledge. Understanding this helps when using optoisolators.
考试技巧
Most common optoisolator configuration = LED and phototransistor. Think 'O'ptoisolator = 'L'ED + 'P'hototransistor. Most optoisolators use LED + phototransistor. Not lens/photomultiplier, not FM laser, not AM laser - just LED and phototransistor.
记忆口诀
Most common optoisolator configuration = LED and phototransistor. Think 'O'ptoisolator = 'L'ED + 'P'hototransistor. Most optoisolators use LED + phototransistor. Important for optoelectronics knowledge.
实际应用示例
An optoisolator or optocoupler: The most common configuration is an LED and a phototransistor. The LED emits light, and the phototransistor detects it, providing electrical isolation. This is the configuration - LED and phototransistor.
错误选项分析
Option A: Incorrect. Lens and photomultiplier isn't common - LED and phototransistor is. Lens/photomultiplier isn't common. Option B: Incorrect. Frequency-modulated helium-neon laser isn't common - LED and phototransistor is. FM laser isn't common. Option C: Incorrect. Amplitude-modulated helium-neon laser isn't common - LED and phototransistor is. AM laser isn't common.
知识点
Most common configuration, Optoisolator, Optocoupler, LED and phototransistor
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.