Deep Dive: E6F05
The correct answer is A: A device that detects rotation by interrupting a light source with a patterned wheel. Which of the following describes an optical shaft encoder is a device that detects rotation by interrupting a light source with a patterned wheel. Optical encoders detect rotation using light interruption. For amateur radio operators, this is important for optoelectronics knowledge. Understanding this helps when working with encoders.
Why Other Answers Are Wrong
Option B: Incorrect. Device measuring strength of light beam using ADC isn't an encoder - encoder detects rotation by interrupting light. Light measurement isn't encoder. Option C: Incorrect. Optical computing device with fiber optics isn't an encoder - encoder detects rotation by interrupting light. Computing device isn't encoder. Option D: Incorrect. Device generating RTTY signals by rotating light source isn't an encoder - encoder detects rotation by interrupting light. RTTY generation isn't encoder.
Exam Tip
Optical shaft encoder = device that detects rotation by interrupting light source with patterned wheel. Think 'O'ptical 'S'haft 'E'ncoder = 'O'ptical 'S'ensing 'E'ncoder (rotation detection). Optical encoders detect rotation using light interruption. Not light measurement, not computing device, not RTTY generation - just rotation detection by interrupting light.
Memory Aid
Optical shaft encoder = device that detects rotation by interrupting light source with patterned wheel. Think 'O'ptical 'S'haft 'E'ncoder = 'R'otation detection. Optical encoders detect rotation using light interruption. Important for optoelectronics knowledge.
Real-World Example
An optical shaft encoder: It's a device that detects rotation by interrupting a light source with a patterned wheel. As the wheel rotates, it interrupts the light, creating pulses that indicate rotation. This is what it is - rotation detection by interrupting light.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E6F
Reference: 2024-2028 Question Pool · E6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E6F topic.