Deep Dive: E7A10
The correct answer is B: A list of inputs and corresponding outputs for a digital device. What is a truth table is a list of inputs and corresponding outputs for a digital device. Truth tables show all input/output combinations. For amateur radio operators, this is important for digital circuits. Understanding this helps when analyzing logic.
Why Other Answers Are Wrong
Option A: Incorrect. List for op-amp isn't truth table - truth table is for digital devices. Op-amp isn't truth table. Option C: Incorrect. Diagram showing logic states when output is true isn't truth table - truth table is a list of inputs/outputs. Diagram isn't truth table. Option D: Incorrect. Table of logic symbols for op-amp isn't truth table - truth table is for digital devices. Op-amp symbols isn't truth table.
Exam Tip
Truth table = list of inputs and corresponding outputs for digital device. Think 'T'ruth 'T'able = 'T'able of 'T'ruth (input/output combinations). Truth tables show all input/output combinations. Not op-amp, not diagram, not op-amp symbols - just list of inputs/outputs for digital device.
Memory Aid
Truth table = list of inputs and corresponding outputs for digital device. Think 'T'ruth 'T'able = 'I'nput/'O'utput list. Truth tables show all input/output combinations. Important for digital circuits.
Real-World Example
A truth table: It's a list of inputs and corresponding outputs for a digital device. For example, an AND gate truth table shows: 0,0→0; 0,1→0; 1,0→0; 1,1→1. This is what a truth table is - input/output list.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E7A
Reference: 2024-2028 Question Pool · E7 - Practical Circuits
Key Concepts
Official Pool Source
Question text and answer key are synchronized with the current NCVEC Extra Class pool and mapped to the E7A topic.