Question

Which one is universal gate

• A. NOR gate
• B. Nand gate
• C. AND gate
• D. both (A) and (B)

Answer 1

Answer: (D)

both (A) and (B)

NAND gate and NOR gate is universal gate.

A NOR gate is a logic gate which gives a positive output only when both inputs are negative. Like NAND gates, NOR gates are so-called "universal gates" that can be combined to form any other kind of logic gate.

A universal gate is a gate which can implement any Boolean function without need to use any other gate type. The NAND and NOR gates are universal gates. This is advantageous since NAND and NOR gates are economical and easier to fabricate and are the basic gates used in all IC digital logic families.