First slide

Logic gates

Question

The circuit diagram (see figure) shows a 'logic combination' with the states outputs X, Y and Z given for inputs P, Q R and S all at state 1 (i.e., high). When inputs P and R change to state 0 (i.e., low) with inputs Q and S still at 1, the condition of output X , Y and Z changes to

Moderate

A

X-1; Y-0; Z-0
B

X-1; Y-1; Z-1
C

X-0; Y-1; Z-0
D

X-0; Y-0; Z-1

Solution

The following arguments shall help us to arrive at the right choice.
AND gate shall not respond to zero input.
Since R is zero and S is1 therefore NOR gate gives zero. NOT gives 'l ' correspond to 0.
NOR gate would not respond to 0 and 1.

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