Exam-style question
Try this first
Which statement correctly describes a NAND gate?.
- A.It produces 1 only when both inputs are 1
- B.It produces 0 only when both inputs are 1
- C.It produces 0 whenever either input is 0
- D.It produces 1 only when exactly one input is 1
Model answer
What a good answer should say
- It produces 0 only when both inputs are 1.
Explanation
Why this works
A NAND gate is an AND operation followed by NOT. The AND output is 1 only for two 1 inputs, so the NAND output is then 0.
Common mistake
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