What is tri-state logic?
The correct answer is A: Logic devices with 0, 1, and high-impedance output states. What is tri-state logic is logic devices with 0, 1, and high-impedance output states. Tri-state logic has three states: 0, 1, and high-Z. For amateur radio operators, this is important for digital circuits. Understanding this helps when working with digital logic.
Exam Tip
Tri-state logic = logic devices with 0, 1, and high-impedance output states. Think 'T'ri-'S'tate = 'T'hree 'S'tates (0, 1, high-Z). Tri-state logic has three states: 0, 1, and high-Z. Not ternary math, not three impedances, not eight states - just 0, 1, high-Z.
Memory Aid
"Tri-state logic = logic devices with 0, 1, and high-impedance output states. Think 'T'ri-'S'tate = '3' states. Tri-state logic has three states: 0, 1, and high-Z. Important for digital circuits."
Real-World Application
Tri-state logic: It's logic devices with 0, 1, and high-impedance output states. The high-impedance state allows multiple devices to share a bus without conflict. This is what tri-state logic is - 0, 1, and high-Z states.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Logic devices utilizing ternary math isn't tri-state - tri-state is 0, 1, high-Z. Ternary math isn't tri-state.
Option C: Incorrect. Logic with three output impedances selectable isn't tri-state - tri-state is 0, 1, high-Z. Three impedances isn't tri-state.
Option D: Incorrect. Counter with eight states isn't tri-state - tri-state is 0, 1, high-Z. Eight states isn't tri-state.
题目解析
The correct answer is A: Logic devices with 0, 1, and high-impedance output states. What is tri-state logic is logic devices with 0, 1, and high-impedance output states. Tri-state logic has three states: 0, 1, and high-Z. For amateur radio operators, this is important for digital circuits. Understanding this helps when working with digital logic.
考试技巧
Tri-state logic = logic devices with 0, 1, and high-impedance output states. Think 'T'ri-'S'tate = 'T'hree 'S'tates (0, 1, high-Z). Tri-state logic has three states: 0, 1, and high-Z. Not ternary math, not three impedances, not eight states - just 0, 1, high-Z.
记忆口诀
Tri-state logic = logic devices with 0, 1, and high-impedance output states. Think 'T'ri-'S'tate = '3' states. Tri-state logic has three states: 0, 1, and high-Z. Important for digital circuits.
实际应用示例
Tri-state logic: It's logic devices with 0, 1, and high-impedance output states. The high-impedance state allows multiple devices to share a bus without conflict. This is what tri-state logic is - 0, 1, and high-Z states.
错误选项分析
Option B: Incorrect. Logic devices utilizing ternary math isn't tri-state - tri-state is 0, 1, high-Z. Ternary math isn't tri-state. Option C: Incorrect. Logic with three output impedances selectable isn't tri-state - tri-state is 0, 1, high-Z. Three impedances isn't tri-state. Option D: Incorrect. Counter with eight states isn't tri-state - tri-state is 0, 1, high-Z. Eight states isn't tri-state.
知识点
Tri-state logic, Logic devices, 0, 1, and high-impedance output states
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.