GATE 2016 EC (EC3) – Question 27

Digital Circuits · Combinatorial Circuits · 1 mark · Multiple choice

The logic function realized by the circuit below is

Show answer and explanation

Correct answer: (D) AND

Explanation

When B=1, the upper switch is on and connects output Y to A, while the lower switch controlled by the complement of B is off. Thus Y=A.

When B=0, the upper switch is off and the lower switch grounds Y. Hence Y=0 regardless of A.

Combining the two cases gives Y=AB, the **AND function, D**.

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