1
GATE EE 2007
+2
-0.6
$$A,B,C$$ and $$D$$ are input bits, and $$Y$$ is the output bit in the $$XOR$$ gate circuit of the figure below. Which of the following statements about the sum $$S$$ of $$A,B,C,D$$ and $$Y$$ is correct?
A
$$S$$ is always either zero or odd
B
$$S$$ is always either zero or even
C
$$S=1$$ only if the sum of $$A,B,C$$ and $$D$$ is even
D
$$S=1$$ only if the sum of $$A,B,C$$ and $$D$$ is odd
2
GATE EE 2005
+2
-0.6
In the figure, as long as $${X_1} = 1$$ and $${X_2} = 1,$$ the output $$Q$$ remains
A
at $$1$$
B
at $$0$$
C
at its initial value
D
unstable
3
GATE EE 2004
+2
-0.6
A digital circuit which compares two numbers $${A_3}{A_2}{A_1}{A_0},\,\,{B_3}{B_2}{B_1}{B_0}$$ is shown in Fig. To get output $$Y=0,$$ choose one pair of correct input numbers
A
$$1010, 1010$$
B
$$0101,0101$$
C
$$0010, 0010$$
D
$$0010, 1011$$
4
GATE EE 2002
+2
-0.6
For the circuit shown in Fig. the Boolean expression for the output $$Y$$ in terms of inputs $$P,$$ $$Q,$$ $$R$$ and $$S$$ is
A
$$\overline P + \overline Q + \overline R + \overline S$$
B
$$P+Q+R+S$$
C
$$\left( {\overline P + \overline Q } \right)\left( {\overline R + \overline S } \right)$$
D
$$(P+Q) (R+S)$$
EXAM MAP
Medical
NEET