Exam-style question
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Which gate is represented by a symbol with two input lines converging to a curved surface and a flat output line, and a small circle at the output?.
- A.XNOR gate
- B.XOR gate
- C.NAND gate
- D.NOR gate
Model answer
What a good answer should say
- XNOR gate
Explanation
Why this works
Rule: An XNOR gate symbol is an XOR gate symbol with a small circle at the output. Substitution: Symbol has two inputs, curved surface, flat output, and a small circle at the output.
Working: The small circle indicates that the output is the inverse of the XOR operation. Answer: XNOR gate.
Conclusion: This symbol represents an XNOR gate.
Common mistake
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