Question

In the circuit given A, B and C are inputs and Y is the output. The output of Y is:

• A. Low for all low inputs
• B. High for all the high inputs
• C. High for all the low inputs
• D. None of these

Answer 1

Answer: (A)

Low for all low inputs

The inputs are $A$ and $B$.

After going to $NOR$ gate, the output is $\overline{A+B}$

After going to $AND$ gate, the output is $\overline{A+B}.C$

If we do the truth-table, we will find out that the output is always low for every case.