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Question:

Two following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage wave forms of A, B and Y are as given. The logic gate is OR gate, NAND gate, NOR gate, AND gate?

OR gate

NAND gate

NOR gate

AND gate

Solution:

It is clear from given logic circuit, that output Y is low when both the inputs are high, otherwise it is high. Thus, logic circuit is NAND gate.
A B Y
1 1 0
0 0 1
0 1 1
1 0 1