Any combinational circuit can be designed using only

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VSSC (ISRO) Technician B: Electronic Mechanic Previous Year Paper (Held on 10 Dec 2017)
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  1. AND gates
  2. OR gates
  3. XOR gates
  4. NOR gates

Answer (Detailed Solution Below)

Option 4 : NOR gates
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Detailed Solution

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Concept:

A universal gate is the one with which any other Boolean function can be implemented without the need of other gates.

Explanation:

Two universal gates are NAND and NOR.

NAND:

In this gate, output of logic gate is false only when both the inputs are true. It is the complement of AND gate.

NOR gate: Output of this logic gate is true when both inputs are false.

Truth Table:

A

B

A NAND B

A NOR B

0

0

1

1

0

1

1

0

1

0

1

0

1

1

0

0

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