Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 93

95. Which logic gate is represented by the following combination of logic gate?

[2015]

(a) NAND

(b) AND

(c) NOR

(d) OR

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Answer:

Correct Answer: 95. (b)

Solution:

  1. (b) First two gates are NOT gates and the last gate is NOR gate.

Thus, $Y_1=\overline{A}, Y_2=\overline{B}$ and $Y=\overline{Y_1+Y_2}$

The truth table corresponding to this is as follows:

$A$ $B$ $Y_1=\overline{A}$ $Y_2=\overline{B}$ $Y_1+Y_2$ $Y=\overline{Y_1+Y_2}$ $A \cdot B$
0 0 1 1 1 0 0
0 1 1 0 1 0 0
1 0 0 1 1 0 0
1 1 0 0 0 1 1

Thus the combination of gate represents AND gate.



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