Deep Dive: E7A07
The correct answer is D: It produces a 0 at its output only if all inputs are 1. What logical operation does a NAND gate perform is that it produces a 0 at its output only if all inputs are 1. NAND = NOT AND, so output is 0 when all inputs are 1. For amateur radio operators, this is important for digital circuits. Understanding this helps when working with logic gates.
Why Other Answers Are Wrong
Option A: Incorrect. Producing 0 only if all inputs are 0 isn't NAND - NAND produces 0 when all inputs are 1. All inputs 0 isn't NAND. Option B: Incorrect. Producing 1 only if all inputs are 1 isn't NAND - NAND produces 0 when all inputs are 1. Producing 1 isn't NAND. Option C: Incorrect. Producing 0 if some but not all inputs are 1 isn't NAND - NAND produces 0 when all inputs are 1. Some inputs isn't NAND.
Exam Tip
NAND gate operation = produces 0 only if all inputs are 1. Think 'N'AND = 'N'OT 'A'ND (0 when all 1). NAND = NOT AND, so output is 0 when all inputs are 1. Not all 0, not produces 1, not some inputs - just 0 when all inputs are 1.
Memory Aid
NAND gate operation = produces 0 only if all inputs are 1. Think 'N'AND = 'N'OT 'A'ND. NAND = NOT AND, so output is 0 when all inputs are 1. Important for digital circuits.
Real-World Example
A NAND gate: It produces a 0 at its output only if all inputs are 1. NAND is the inverse of AND - when all inputs are 1, output is 0. This is the operation - 0 when all inputs are 1.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7A
Reference: 2024-2028 Question Pool · E7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E7A topic.