GATE EE 2004 Digital Electronics Q 3 - Grad Plus
GATE EE 2004 Digital Electronics Q 3

GATE EE 2004 Digital Electronics Q 3

A digital circuit which compares two numbers A3 A2 A1 A0, B3 B2 B1 B0 is shown in figure. To get output Y=0, choose one pair of correct input numbers.

a) 1010, 1010

b) 0101, 0101

c) 0010, 0010

d) 1010, 1011

Ans: (d)

Explanation

For a 4-input X-NOR gate output, Y = 0 will happen if number of 1’s will be odd.

For XOR gate, output will be ‘1’ if its inputs are different. Hence for options (a), (b) and (c), all the outputs are 1 and final output of X-NOR will also be 1 as four ones (even).

So only in option (d) the inputs are different so Y will be zero.

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