Electrical Engineering XYZ MCQs
Which of these sets of logic gates are designated as universal gates:
- OR, NOT, AND
- NOR, NAND, XNOR
- NOR, NAND
- XOR, NOR, NAND
Correct answer: 3. NOR, NAND
Explanation:
Universal gates are those logic gates from which all other basic logic gates can be derived. In other words, using only one type of gate, you can construct any other gate. The two common universal gates are NOR and NAND gates.
- NOR gate: A NOR gate produces a low output only when both of its inputs are high; otherwise, it produces a high output. It can be used to create NOT, AND, and OR gates.
- NAND gate: A NAND gate produces a low output only when both of its inputs are high; otherwise, it produces a high output. It can be used to create NOT, AND, and OR gates.
Both NOR and NAND gates can be combined in various configurations to emulate the behavior of other gates. This property makes them universal gates. Therefore, the correct set of universal gates is NOR, NAND.