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:
- (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.
