GATE EE

Combinational Circuits

Digital Electronics

(Past Years Questions)

Marks 1

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Consider the following circuit which uses a $$2$$-to-$$1$$ multiplexer as shown in the figure below. The Boolean express...
GATE EE 2016 Set 1
In the $$4 \times 1$$ multiplexer, the output $$F$$ is given by $$F = A \oplus B.$$ Find the required input $${{\rm I}_3...
GATE EE 2015 Set 1
The output $$Y$$ of a $$2$$ $$-$$ bit comparator is logic $$1$$ whenever the $$2$$-bit input $$A$$ is greater than the $...
GATE EE 2012
The output $$Y$$ of the logic circuit given below is ...
GATE EE 2011
Figure shows a $$4$$ to $$1$$ $$MUX$$ to be used to implement the sum $$S$$ of a $$1$$-bit full adder with input bits $$...
GATE EE 2003
The output $$f$$ of the $$4$$- to- $$1$$ $$MUX$$ shown in fig. is ...
GATE EE 2001

Marks 2

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A Boolean function $$f\left( {A,B,C,D} \right) = \Pi \left( {1,5,12,15} \right)$$ is to be implemented using an $$8 \tim...
GATE EE 2015 Set 2
Two monoshot multivibrators, one positive edge triggered $$\left( {{M_1}} \right)$$ and another negative edge triggered ...
GATE EE 2014 Set 3
A $$3$$-bit gray counter is used to control the output of the multiplexer as shown in the figure. The initial state of t...
GATE EE 2014 Set 3
A $$3$$ line to $$8$$ line decoder, with active low outputs, is used to implement a $$3$$- variable Boolean function as ...
GATE EE 2008
A $$4 \times 1\,\,MUX$$ is used to implement a $$3$$- input Boolean function as shown in figure. The Boolean function $$...
GATE EE 2006
The minimal product-of-sums function described by the $$K$$-map given in Fig. ...
GATE EE 2000
The logic function $$F = AC + ABD + ACD$$ is to be realized using an $$8$$ to $$1$$ multiplexer shown in figure, using $...
GATE EE 1999
Match the following ...
GATE EE 1998

Marks 5

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In a digital combinational circuit with $$4$$ inputs $$(A, B, C, D),$$ it is required to obtain an output of logical $$1...
GATE EE 1998
A $$3$$-input $$2$$-output priority encoder has the following truth table where $$'X'$$ indicate don't care conditions. ...
GATE EE 1997

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