1
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
$$\overline C \,(\overline {A \oplus B)} \, + C(A \oplus B)$$
2
GATE ECE 2001
MCQ (Single Correct Answer)
+2
-0.6
In the figure the LED GATE ECE 2001 Digital Circuits - Logic Gates Question 13 English
A
emits light when both S1 and S2 are closed.
B
emits light when both S1 and S2 are open.
C
emits light when only S1 or S2 is closed.
D
does not emit light, irrespective of the switch positions.
3
GATE ECE 2001
Subjective
+5
-0
For the digital block shown in Figure. 2(a), the output Y=f(S3,S2,S1,S0) where S3 is MSB and S0 is LSB. Y is given in terms of minterms as $$Y\, = \,\sum m\left( {1,5,6,7,11,12,13,15} \right)$$ and its complements $$\overline Y \, = \,\sum m\left( {0,2,3,4,8,9,10,14} \right)$$. GATE ECE 2001 Digital Circuits - Logic Gates Question 5 English 1 GATE ECE 2001 Digital Circuits - Logic Gates Question 5 English 2

(a) Enter the logical values in the given Karnaugh map [figure2(b)] for the output Y.
(b) Write down the expression for Y in sum-of products from using minimum number of terms.
(c) Draw the circuit for the digital logic boxes using four 2-input NAND gates only for each of the boxes.

4
GATE ECE 2001
MCQ (Single Correct Answer)
+2
-0.6
The digital block in the figure is realized using two positive edge triggered D flip-flops. Assume that for t < t0, Q1 = Q2 =0. The circuit in the digital block is given by

GATE ECE 2001 Digital Circuits - Sequential Circuits Question 40 English
A
GATE ECE 2001 Digital Circuits - Sequential Circuits Question 40 English Option 1
B
GATE ECE 2001 Digital Circuits - Sequential Circuits Question 40 English Option 2
C
GATE ECE 2001 Digital Circuits - Sequential Circuits Question 40 English Option 3
D
GATE ECE 2001 Digital Circuits - Sequential Circuits Question 40 English Option 4
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