| A | B | C |
| 1 | 1 | 0 |
| 1 | 0 | 1 |
| 0 | 1 | 1 |
| 0 | 0 | 1 |
A) an OR gate
B) an AND gate
C) a NOR gate
D) a NAND gate
Correct Answer: D
Solution :
The given truth table follows a NAND gate whose output is 1 only if at least one of its inputs is zero. Its Boolean expression is \[Y=\overline{A.B}\] So that \[\overline{1.1}=\bar{1}=0\] \[\overline{1.0}=\bar{0}=1\] \[\overline{0.1}=\bar{0}=1\] \[\overline{0.0}=\bar{0}=1\] Note: NAND gate is called universal or digital building block because by the repeated use of NAND gates we can perform all the logic functions like OR, AND, etc.
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