1
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
The circuit shown in figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z with
Y = $$\,P \oplus \,Q\, \oplus \,R$$
z= $$RQ + \overline P R\, + Q\,\overline P $$ GATE ECE 2003 Digital Circuits - Combinational Circuits Question 30 English The circuit acts as a
A
4 bit adder giving P + Q
B
4 bit subtractor-giving P - Q
C
4 bit subtractor-giving Q - P
D
4 bit adder giving P + Q + R
2
GATE ECE 2001
MCQ (Single Correct Answer)
+2
-0.6
In the TTL circuit in Figure 2.11, $${S_0}$$ to $${S_0}$$ are select lines and $${X_7}$$ and $${X_0}$$are input lines. $${S_0}$$ and $${X_0}$$ are LSB'. The output Y is GATE ECE 2001 Digital Circuits - Combinational Circuits Question 32 English
A
indeterminate
B
A ⊕ B
C
$$\overline {A \oplus B} $$
D
$$\overline C \,(\overline {A \oplus B)} \, + C(A \oplus B)$$
3
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
For a binary half-sub-tractor having two inputs A and B, the correct set of logical expressions for the outputs D (=A minus B) and X (=borrow) are
A
$$D = \,AB + \overline A \,B,\,X = \overline A \,B$$
B
$$D = \,\overline A \,B + A\overline B + A\overline B ,\,X = A\overline B $$
C
$$D = \,\overline A \,B + A\overline B ,\,X = \overline A \,B$$
D
$$D = \,AB + \overline A \,\overline B ,\,X = A\overline B $$
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