First slide

Logic gates

Question

The output of OR gate is 1

Moderate

A

if both inputs are zero
B

if either or both inputs are 1
C

only if both inputs are 1
D

if either input is zero

Solution

OR gate has two inputs A and B and a output Y. It follows a logic operation represented by '+'. Thus, its Boolean expression is
A + B = Y
The truth table of OR gate is
Thus, after observing its Boolean expression and its truth table, it is obvious that output of OR gate is 1 if either or both inputs are 1.

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