Q43 / 237 · NTA Abhyas (NEET) 2020 · Physics · Semiconductors

Which logic gate is represented by the following combination of logic gates?

A
OR
B
NAND
Correct answer
C
AND
D
NOR

Solution

y_{1} = \bar{A}, y_{2} = \bar{B}

y = \bar{y_{1} + y_{2}} = \bar{\bar{A} + \bar{B}}

Using De-Morgan's theorem

y = \bar{\bar{A} + \bar{B}} = A . B

Truth table:

A	B	$y_{1}$	$y_{2}$	y
0	0	1	1	0
0	1	1	0	0
1	0	0	1	0
1	1	0	0	1

Hence, the correct answer is option: 'C'.

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