JNTU
JNTU B.Tech II SWITCHING THEORY AND LOGIC DESIGN Previous Question Paper (May - 2019 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Perform the following conversions (476.64)10 = ( )2 = ( )8.
Answer
(476.64)10 = (111011100.10100)2 = (734.50)8.
Perform the following operation using 2’s complement method 1111.10 – 0101.11.
Answer
To perform 1111.10 - 0101.11, find the 2's complement of 0101.11, which is 1010.01. Adding this to 1111.10 gives 1111.10 + 1010.01 = 11001.11. Discarding the carry results in 1001.11.
Define Multiplexer. Explain in brief about 2:1 Mux.
Answer
Sign in to view the complete answer paper.
Explain the procedure to construct the 3 variable K-map with an example.
Answer
Sign in to view the complete answer paper.
Derive the characteristic equations of D and T flipflop.
Answer
Sign in to view the complete answer paper.
Give the differences between latches and flipflops.
Answer
Sign in to view the complete answer paper.
Define state diagram.
Answer
Sign in to view the complete answer paper.
List the features of sequential circuits.
Answer
Sign in to view the complete answer paper.
What are finite state machines?
Answer
Sign in to view the complete answer paper.
List the limitations of finite state machines.
Answer
Sign in to view the complete answer paper.
Part B
Design and realize the 3 bit binary to unit distance code using NOR gates.
Answer
Sign in to view the complete answer paper.
Simplify and realize the following Boolean expression using logic gates.
Y=AB+A′C+BC
Answer
Sign in to view the complete answer paper.
Y=(A+B′+C′)(A+B′+C)
Answer
Sign in to view the complete answer paper.
Design a digital system to compare two binary numbers of 1 bit by using logic gates.
Answer
Sign in to view the complete answer paper.
Realize 3:8 maxterm generator using 2:4 maxterm generators. Using the same, Design a system to provide the difference of two numbers. Use external two input gates only.
Answer
Sign in to view the complete answer paper.
Explain master slave JK flipflop with neat timing diagram.
Answer
Sign in to view the complete answer paper.
Explain the principle of Universal shift Register(USR). Using the same, design 4-bit, mod-8 twisted ring counter.
Answer
Sign in to view the complete answer paper.
Design a digital system using data flipflops to monitor the status of the bookrack of maximum occupancy 10. The number of books available in the bookrack on a daily basis for the following conditions over a week.
- On Monday, there were 10 books.
- On Tuesday, 2 books were removed and donated to near by library.
- On Wednesday, one book is added to the bookrack.
- Next day, 3 books were removed from the rack and given it to neighbour.
- On Friday, one book was taken out for reading.
- On Saturday, neighbour returned only two books.
- All the remaining books were taken out on Sunday to clean the rack.
Answer
Sign in to view the complete answer paper.
Discuss about the approaches of designing synchronous sequential finite state machines.
Answer
Sign in to view the complete answer paper.
Design a digital controller for the state table shown below using sequential component as single input data flip flop.
| Present state | Next state, Output(z) (Input(x)=0) | Next state, Output(z) (Input(x)=1) |
|---|---|---|
| A | C,0 | B,1 |
| B | D,0 | D,0 |
| C | C,1 | A,0 |
| D | A,1 | A,0 |
Answer
Sign in to view the complete answer paper.
Draw the state diagram of a Mealy machine that produces a 1 output if there have been four or more consecutive 1 inputs or two or more consecutive 0 inputs.
Answer
Sign in to view the complete answer paper.
With a neat block diagram, explain the moore model of a clocked synchronous sequential circuit.
Answer
Sign in to view the complete answer paper.
Illustrate partition techniques in sequential circuits.
Answer
Sign in to view the complete answer paper.