Deep Dive: G7B03
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G7B
Reference: 2023-2027 Question Pool · G7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G7B topic.