Which of the following describes the function of a two-input AND gate?
The correct answer is B: Output is high only when both inputs are high. What describes the function of a two-input AND gate is that output is high only when both inputs are high. AND gates require all inputs to be high for the output to be high. For amateur radio operators, this is fundamental digital logic. Understanding this helps when working with digital circuits.
Exam Tip
AND gate function = output high only when both inputs high. Think 'A'ND = 'A'll inputs 'N'eed to be 'D'igital high. AND gates require all inputs to be high for output to be high. Not NOR, not NAND - just AND.
Memory Aid
"AND gate function = output high only when both inputs high. Think 'A'ND = 'A'll inputs 'N'eed to be high. AND gates require all inputs to be high for output to be high. Fundamental AND gate logic."
Real-World Application
A two-input AND gate: If input A is high and input B is high, output is high. If either input is low, output is low. AND gates require all inputs to be high for the output to be high. This is fundamental AND gate logic.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Output isn't high when either or both inputs are low - that's a NOR gate. AND gate requires both inputs high.
Option C: Incorrect. Output isn't low when either or both inputs are high - that's a NAND gate. AND gate output is high when both inputs are high.
Option D: Incorrect. Output isn't low only when both inputs are high - that's a NAND gate. AND gate output is high when both inputs are high.
题目解析
The correct answer is B: Output is high only when both inputs are high. What describes the function of a two-input AND gate is that output is high only when both inputs are high. AND gates require all inputs to be high for the output to be high. For amateur radio operators, this is fundamental digital logic. Understanding this helps when working with digital circuits.
考试技巧
AND gate function = output high only when both inputs high. Think 'A'ND = 'A'll inputs 'N'eed to be 'D'igital high. AND gates require all inputs to be high for output to be high. Not NOR, not NAND - just AND.
记忆口诀
AND gate function = output high only when both inputs high. Think 'A'ND = 'A'll inputs 'N'eed to be high. AND gates require all inputs to be high for output to be high. Fundamental AND gate logic.
实际应用示例
A two-input AND gate: If input A is high and input B is high, output is high. If either input is low, output is low. AND gates require all inputs to be high for the output to be high. This is fundamental AND gate logic.
错误选项分析
Option A: Incorrect. Output isn't high when either or both inputs are low - that's a NOR gate. AND gate requires both inputs high. Option C: Incorrect. Output isn't low when either or both inputs are high - that's a NAND gate. AND gate output is high when both inputs are high. Option D: Incorrect. Output isn't low only when both inputs are high - that's a NAND gate. AND gate output is high when both inputs are high.
知识点
AND gate, Two-input, Both inputs high, Digital logic
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.