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GATE 2023 Digital Circuits Quiz 23
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Question 1
A one bit full adder takes 75 nsec to produce sum and 50 nsec to produce carry. A 4 bit parallel adder is designed using this type of full adder. The maximum rate of additions per second can be provided by 4 bit parallel adder is Ax106 additions/sec. The value of A is _____ .
Question 2
consider the combinational circuit shown below
What is the circuit shown in figure
Question 3
In the following circuit, X is given by
Question 4
The building block shown in fig. is a active high output decoder.
The output X is
The output X is
Question 5
consider the following circuits (assume all gates have a finite propagation delay)
1)
2)
3)
4)
Which of these circuits generate a periodic square wave output?
1)
2)
3)
4)
Which of these circuits generate a periodic square wave output?
Question 6
Consider a 3-bit number A and 2 bit number B are given to a multiplier. The output of multiplier is realized using AND gate and one bit full adders. If minimum number of AND gates required are X and one bit full adders required are 
then 
________.
then ________. Question 7
A 4-bit parallel binary adder is built using four full adders. If each full adder takes 44ns to produce the sum bit and 14ns to produce carry bit, then the time required for addition of two 4-bit numbers is.
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