Question:
Identify the operation performed by the circuit given below :
Identify the operation performed by the circuit given below :
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Each input first passes through a NOR gate with its inputs joined (which acts as NOT); the three outputs then feed a 3-input NOR gate. Apply De Morgan's law.
Updated On: Nov 5, 2026
- AND
- NAND
- OR
- NOT
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The Correct Option is A
Solution and Explanation
In the figure, each of A, B, C feeds a NOR gate with a single (tied) input, which acts as a NOT gate: outputs \(\bar{A}, \bar{B}, \bar{C}\).
These go to a 3-input NOR gate: \(Y = \overline{\bar{A} + \bar{B} + \bar{C}}\).
By De Morgan's law, \(Y = \bar{\bar{A}}\cdot\bar{\bar{B}}\cdot\bar{\bar{C}} = A\cdot B\cdot C\).
This is the AND operation.
Answer: (1) AND
These go to a 3-input NOR gate: \(Y = \overline{\bar{A} + \bar{B} + \bar{C}}\).
By De Morgan's law, \(Y = \bar{\bar{A}}\cdot\bar{\bar{B}}\cdot\bar{\bar{C}} = A\cdot B\cdot C\).
This is the AND operation.
Answer: (1) AND
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