Which basic logic gate produces an output of digital 0 (LOW) only when all of its input terminals are simultaneously at digital 1 (HIGH)?
Answer and explanation
Correct answer: C. NAND gate
- Step 1: An AND gate produces 1 only when all inputs are 1. Step 2. A NAND gate (NOT-AND) inverts the AND output, giving 0 only when all inputs are 1, and 1 for all other input combinations. Answer: NAND gate. Why not the others: A NOR gate outputs 0 whenever any input is 1; an AND gate outputs 1 when all inputs are 1; an XOR gate outputs 0 when inputs are identical.
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