Question

The output of a NAND gate is 0.

• A. If both inputs are 0
• B. If one input is 0 and the other input is 1
• C. If both inputs are 1
• D. Either if both inputs are 1 or if one of the inputs is 1 and the other 0

Answer 1

Answer: (C)

If both inputs are 1

Answer 2

If inputs are A and B then output for NAND gate is $Y = \overline{AB}$

⇒ If $A = B = 1$, $Y = \overline{1.1} = \bar{1} = 0$