1
GATE ECE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A 1-to-8 demultiplexer with data input D$$_{in}$$ , address inputs S$$_{0}$$, S$$_{1}$$, S$$_{2}$$ (with S$$_{0}$$ as the LSB) and $${\overline Y _0}$$ to $${\overline Y _7}$$
as the eight demultiplexed outputs, is to be designed using two 2-to-4 decoders (with enable input $$\overline E $$ and address inputs A$$_{0}$$ and A$$_{1}$$) as shown in the figure. $${D_{in}}$$, S$$_{0}$$, S$$_{1}$$and S$$_{2}$$ are to be
connected to P, Q, R and S, but not necessarily in this order. The respective input connections to P,
Q, R, and S terminals should be


2
GATE ECE 2014 Set 4
Numerical
+2
-0
A 16-bit ripple carry adder is realized using 16 identical full adders (FA) as shown in the figure.
The carry-propagation delay of each FA is 12 ns and the sum-propagation delay of each FA is
15 ns. The worst case delay (in ns) of this 16-bit adder will be_______________.


Your input ____
3
GATE ECE 2014 Set 4
MCQ (Single Correct Answer)
+2
-0.6
An 8-to-1 multiplexer is used to implement a logical function Y as shown in the figure. The output Y is given by


4
GATE ECE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
In the circuit shown, 𝑊𝑊 and 𝑌𝑌 are MSBs of the control inputs. The output 𝐹𝐹 is given by

Questions Asked from Combinational Circuits (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE ECE 2018 (1)
GATE ECE 2017 Set 2 (2)
GATE ECE 2016 Set 3 (1)
GATE ECE 2016 Set 1 (2)
GATE ECE 2015 Set 2 (1)
GATE ECE 2014 Set 4 (2)
GATE ECE 2014 Set 3 (2)
GATE ECE 2010 (1)
GATE ECE 2009 (1)
GATE ECE 2008 (1)
GATE ECE 2007 (1)
GATE ECE 2004 (1)
GATE ECE 2003 (2)
GATE ECE 2001 (1)
GATE ECE 1999 (1)
GATE ECE Subjects
Network Theory
Control Systems
Electronic Devices and VLSI
Analog Circuits
Digital Circuits
Microprocessors
Signals and Systems
Representation of Continuous Time Signal Fourier Series
Discrete Time Signal Fourier Series Fourier Transform
Discrete Time Signal Z Transform
Continuous Time Linear Invariant System
Transmission of Signal Through Continuous Time LTI Systems
Discrete Time Linear Time Invariant Systems
Sampling
Continuous Time Signal Laplace Transform
Discrete Fourier Transform and Fast Fourier Transform
Transmission of Signal Through Discrete Time Lti Systems
Miscellaneous
Fourier Transform
Communications
Electromagnetics
General Aptitude