COMPUTER SCIENCE 2210 · STRUCTURED PRACTICE
A quality control test station on an automated electronics assembly line uses the digital logic circuit shown in the diagram to verify component configuration signals A, B, and C.
Identify the standard logic gate name for each of the five gates labelled Gate 1, Gate 2, Gate 3, Gate 4, and Gate 5 in the circuit diagram.
Write a complete Boolean logic expression that defines output X directly in terms of the primary inputs A, B, and C.
Complete the 8-row truth table for the circuit, showing the logic states for intermediate wires P, Q, R, S, and final output X.
State the input condition(s) for (A, B, C) that cause the final output X to become 0.
An engineer notices that the circuit output X is 0 only when both A = 1 and B = 1, regardless of input C. Suggest a single standard two-input logic gate with inputs A and B that could replace this entire 5-gate circuit while producing the exact same truth table output X for all input combinations. Justify your answer.
Total: 11 marks