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1
GATE ECE 2024
MCQ (Single Correct Answer)
+2
-1.33

A 4-bit priority encoder has inputs $D_3, D_2, D_1,$ and $D_0$ in descending order of priority. The two-bit output $AB$ is generated as 00, 01, 10, and 11 corresponding to inputs $D_3, D_2, D_1,$ and $D_0$, respectively. The Boolean expression of the output bit $B$ is _______.

A

$\overline{D_3} ~\overline{D_2}$

B

$\overline{D_3} D_2 + \overline{D_3}~ \overline{D_1}$

C

${D_3} \overline{D_2} + \overline{D_3} D_1$

D
$D_3+\overline{D}_2 D_1$
2
GATE ECE 2024
MCQ (Single Correct Answer)
+2
-1.33

The propagation delay of the 2 x 1 MUX shown in the circuit is 10 ns. Consider the propagation delay of the inverter as 0 ns.

GATE ECE 2024 Digital Circuits - Combinational Circuits Question 5 English

If S is set to 1 then the output Y is _______.

A

a square wave of frequency 100 MHz

B

a square wave of frequency 50 MHz

C

constant at 0

D

constant at 1

3
GATE ECE 2018
MCQ (Single Correct Answer)
+2
-0.67
A four-variable Boolean function is realized using 4 $$ \times $$ 1 multiplexers as shown in the figure. GATE ECE 2018 Digital Circuits - Combinational Circuits Question 9 English
The minimized expression for F(U, V, W, X) is
A
$$\left( {UV + \overline U \overline V } \right)\overline W $$
B
$$\left( {UV + \overline U \overline V } \right)\left( {\overline W \overline X + \overline W X} \right)$$
C
$$\left( {U\overline V + \overline U V} \right)\overline W $$
D
$$\left( {U\overline V + \overline U V} \right)\left( {\overline W \overline X + \overline W X} \right)$$
4
GATE ECE 2017 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A programmable logic array (PLA) is shown in the figure. GATE ECE 2017 Set 2 Digital Circuits - Combinational Circuits Question 23 English The Boolean function F implemented is
A
$$\overline P \,\overline {Q\,} R + \overline P QR + P\overline {Q\,} \overline R $$
B
$$(\overline P \, + \overline {Q\,} + \,R)(\overline P \, + Q + R) + (P + \overline P \, + \overline R )$$
C
$$\overline P \,\overline {Q\,} R + \overline P QR + P\overline {Q\,} \,\overline R $$
D
$$(\overline P + \,\overline {Q\,} \, + R)(\overline P + Q + R) + (P + \overline {Q\,} + R)$$
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