Question:
In the following digital circuit, what will be the output at 'Z', when the input (A, B) are (1, 0), (0, 0), (1, 1), (0, 1)
In the following digital circuit, what will be the output at 'Z', when the input (A, B) are (1, 0), (0, 0), (1, 1), (0, 1)
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Identify the gates: a NAND and an OR both fed by A and B, an AND combining their outputs (this gives XOR), and a final NOR fed by the NAND output and the AND output.
Updated On: Nov 5, 2026
- 1, 1, 0, 1
- 0, 1, 0, 0
- 1, 0, 1, 1
- 0, 0, 1, 0
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The Correct Option is D
Solution and Explanation
Reading the circuit: gate 1 = NAND(A, B); gate 2 = OR(A, B); gate 3 = AND(gate 1, gate 2), which is XOR(A, B); the final gate is NOR with inputs gate 1 and gate 3. So \(Z = \overline{\overline{AB} + (A\oplus B)}\).
(A,B) = (1,0): NAND = 1, XOR = 1, Z = NOR(1,1) = 0.
(0,0): NAND = 1, XOR = 0, Z = NOR(1,0) = 0.
(1,1): NAND = 0, XOR = 0, Z = NOR(0,0) = 1.
(0,1): NAND = 1, XOR = 1, Z = NOR(1,1) = 0.
Output sequence: 0, 0, 1, 0.
Answer: (4) 0, 0, 1, 0
(A,B) = (1,0): NAND = 1, XOR = 1, Z = NOR(1,1) = 0.
(0,0): NAND = 1, XOR = 0, Z = NOR(1,0) = 0.
(1,1): NAND = 0, XOR = 0, Z = NOR(0,0) = 1.
(0,1): NAND = 1, XOR = 1, Z = NOR(1,1) = 0.
Output sequence: 0, 0, 1, 0.
Answer: (4) 0, 0, 1, 0
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