JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year DIGITAL ELECTRONICS Previous Question Paper (February - 2024 - R22)
Part-A is a compulsory question. Part-B consists of ten questions; the student should answer one from each pair. Hence, the student should answer five questions from Part-B.
PART - A
Compulsory Question
Answer all sub-questions:
Find the equivalent Gray code for [10110]₂.
Answer
To convert the binary number 10110 to Gray code, the Most Significant Bit (MSB) is copied down. Subsequent bits are obtained by performing an XOR operation between the current binary bit and the previous binary bit.
- Binary: 1 0 1 1 0
- Gray MSB: 1
- Next bits: 1⊕0=1, 0⊕1=1, 1⊕1=0, 1⊕0=1
The resulting Gray code is:
Outline the concept of duality in Boolean algebra.
Answer
The Principle of Duality states that any Boolean identity remains valid if the operators (AND and OR) are interchanged and the identity elements (0 and 1) are swapped. If an expression is true, its dual is also true.
What are don’t care terms?
Answer
Sign in to view the complete answer paper.
Prove that the logical sum of all minterms of a Boolean function of 2 variables is 1.
Answer
Sign in to view the complete answer paper.
How does a 1-bit comparator work?
Answer
Sign in to view the complete answer paper.
State the concept of parallel binary adder.
Answer
Sign in to view the complete answer paper.
Mention any two differences between the edge triggering and level triggering.
Answer
Sign in to view the complete answer paper.
What is sequential circuit? Give some example.
Answer
Sign in to view the complete answer paper.
Distinguish between critical race and non-critical race.
Answer
Sign in to view the complete answer paper.
List the different techniques used in State assignment.
Answer
Sign in to view the complete answer paper.
PART - B
Minimize the following Boolean expressions using Boolean Algebra and draw the logic diagram:
Answer
Sign in to view the complete answer paper.
Perform the BCD addition of 375 and -267.
Answer
Sign in to view the complete answer paper.
What are universal logic gates? Implement Ex-OR gate using Universal Logic gates.
Answer
Sign in to view the complete answer paper.
Obtain 3 level NOR – NOR implementation of:
Answer
Sign in to view the complete answer paper.
Using K-map method, Simplify the following Boolean function and obtain (a) minimal SOP and (b) minimal POS expression & realize using only NAND and NOR gates:
Answer
Sign in to view the complete answer paper.
Simplify the following function using K – map,
Answer
Sign in to view the complete answer paper.
Draw and explain the operation of full adder.
Answer
Sign in to view the complete answer paper.
Explain the operation of 4×1 multiplexer using suitable diagram.
Answer
Sign in to view the complete answer paper.
Draw the logic diagram of BCD to Decimal decoder and explain its operations.
Answer
Sign in to view the complete answer paper.
Design a synchronous 3-bit counter which counts in the sequence 1, 3, 2, 6, 7, 5, 4 using T FF.
Answer
Sign in to view the complete answer paper.
Draw the logic diagram for a 5- bit serial load shift register using D FF and explain.
Answer
Sign in to view the complete answer paper.
Classify the methods of Race Free State assignment and explain in detail.
Answer
Sign in to view the complete answer paper.
Explain the different methods of state assignment.
Answer
Sign in to view the complete answer paper.
Design a clocked sequential machine using JK flip flops for the state diagram. Use state reduction if possible and make proper state assignment.
Answer
Sign in to view the complete answer paper.