question_answer

The following figure shows a logic gate circuit with two inputs A and B and the output Y.

The voltage waveforms of A, B and Y are as given.

The logic gate is

A)  NOR gate 

B)  OR gate

C)  AND gate      

D)  NAND gate

Correct Answer: D

Solution :

[d] : 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.