What is a solid-state relay?
The correct answer is B: A device that uses semiconductors to implement the functions of an electromechanical relay. What is a solid-state relay is a device that uses semiconductors to implement the functions of an electromechanical relay. Solid-state relays replace mechanical relays with semiconductors. For amateur radio operators, this is important for component knowledge. Understanding this helps when using relays.
Exam Tip
Solid-state relay = device using semiconductors to implement electromechanical relay functions. Think 'S'olid-'S'tate 'R'elay = 'S'emiconductors 'R'eplace mechanical. Solid-state relays replace mechanical relays with semiconductors. Not transistor-driven coil, not mechanical latch, not monostable switch - just semiconductors implementing relay functions.
Memory Aid
"Solid-state relay = device using semiconductors to implement electromechanical relay functions. Think 'S'olid-'S'tate = 'S'emiconductors. Solid-state relays replace mechanical relays with semiconductors. Important for component knowledge."
Real-World Application
A solid-state relay: It's a device that uses semiconductors to implement the functions of an electromechanical relay. Instead of mechanical contacts, it uses semiconductor switches. This is what it is - semiconductors implementing relay functions.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Relay using transistors to drive relay coil isn't solid-state relay - solid-state relay uses semiconductors instead of mechanical relay. Transistor-driven coil isn't solid-state.
Option C: Incorrect. Mechanical relay that latches isn't solid-state - solid-state relay uses semiconductors instead of mechanical. Mechanical latch isn't solid-state.
Option D: Incorrect. Semiconductor switch using monostable multivibrator isn't solid-state relay - solid-state relay uses semiconductors to implement relay functions. Monostable switch isn't the definition.
题目解析
The correct answer is B: A device that uses semiconductors to implement the functions of an electromechanical relay. What is a solid-state relay is a device that uses semiconductors to implement the functions of an electromechanical relay. Solid-state relays replace mechanical relays with semiconductors. For amateur radio operators, this is important for component knowledge. Understanding this helps when using relays.
考试技巧
Solid-state relay = device using semiconductors to implement electromechanical relay functions. Think 'S'olid-'S'tate 'R'elay = 'S'emiconductors 'R'eplace mechanical. Solid-state relays replace mechanical relays with semiconductors. Not transistor-driven coil, not mechanical latch, not monostable switch - just semiconductors implementing relay functions.
记忆口诀
Solid-state relay = device using semiconductors to implement electromechanical relay functions. Think 'S'olid-'S'tate = 'S'emiconductors. Solid-state relays replace mechanical relays with semiconductors. Important for component knowledge.
实际应用示例
A solid-state relay: It's a device that uses semiconductors to implement the functions of an electromechanical relay. Instead of mechanical contacts, it uses semiconductor switches. This is what it is - semiconductors implementing relay functions.
错误选项分析
Option A: Incorrect. Relay using transistors to drive relay coil isn't solid-state relay - solid-state relay uses semiconductors instead of mechanical relay. Transistor-driven coil isn't solid-state. Option C: Incorrect. Mechanical relay that latches isn't solid-state - solid-state relay uses semiconductors instead of mechanical. Mechanical latch isn't solid-state. Option D: Incorrect. Semiconductor switch using monostable multivibrator isn't solid-state relay - solid-state relay uses semiconductors to implement relay functions. Monostable switch isn't the definition.
知识点
Solid-state relay, Device that uses semiconductors, Implement functions, Electromechanical relay
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.