What device is used as a stable voltage reference?
The correct answer is A: A Zener diode. What device is used as a stable voltage reference is a Zener diode. Zener diodes provide stable voltage references. For amateur radio operators, this is important for power supply design. Understanding this helps when designing regulators.
Exam Tip
Device for stable voltage reference = Zener diode. Think 'Z'ener 'D'iode = 'Z'ero voltage change (stable reference). Zener diodes provide stable voltage references. Not DAC, not SCR, not ADC - just Zener diode.
Memory Aid
"Device for stable voltage reference = Zener diode. Think 'Z'ener = 'V'oltage 'R'eference. Zener diodes provide stable voltage references. Important for power supply design."
Real-World Application
A stable voltage reference: A Zener diode is used. Zener diodes maintain a constant voltage over a range of currents, making them ideal voltage references. This is the device - Zener diode for voltage reference.
Key Concepts
Why Other Options Are Wrong
Option B (Digital-to-analog converter): Incorrect. DAC isn't used as voltage reference - Zener diode is. DAC isn't the device.
Option C (SCR): Incorrect. SCR isn't used as voltage reference - Zener diode is. SCR isn't the device.
Option D (Analog-to-digital converter): Incorrect. ADC isn't used as voltage reference - Zener diode is. ADC isn't the device.
题目解析
The correct answer is A: A Zener diode. What device is used as a stable voltage reference is a Zener diode. Zener diodes provide stable voltage references. For amateur radio operators, this is important for power supply design. Understanding this helps when designing regulators.
考试技巧
Device for stable voltage reference = Zener diode. Think 'Z'ener 'D'iode = 'Z'ero voltage change (stable reference). Zener diodes provide stable voltage references. Not DAC, not SCR, not ADC - just Zener diode.
记忆口诀
Device for stable voltage reference = Zener diode. Think 'Z'ener = 'V'oltage 'R'eference. Zener diodes provide stable voltage references. Important for power supply design.
实际应用示例
A stable voltage reference: A Zener diode is used. Zener diodes maintain a constant voltage over a range of currents, making them ideal voltage references. This is the device - Zener diode for voltage reference.
错误选项分析
Option B (Digital-to-analog converter): Incorrect. DAC isn't used as voltage reference - Zener diode is. DAC isn't the device. Option C (SCR): Incorrect. SCR isn't used as voltage reference - Zener diode is. SCR isn't the device. Option D (Analog-to-digital converter): Incorrect. ADC isn't used as voltage reference - Zener diode is. ADC isn't the device.
知识点
Device, Stable voltage reference, Zener diode
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.