Multiple choice

A universal logic gate can implement any Boolean function by connecting sufficient number of them appropriately. The three are as follows:

Which of the following statements is TRUE?

  1. Gate 1 is a universal gate.

  2. Gate 2 is a universal gate.

  3. Gate 3 is a universal gate.

  4. None of the gates shown is a universal gate.

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C Correct answer
Explanation

In general, the only universal gates are NAND and NOR gates, but none of the given gates is NAND or NOR gate. However, we must observe gate 3. All the Boolean functions can be implemented by using this gate. Hence, it is a universal gate.