2 MARKS
1. Define combinational circuit
2. Sketch the truth table ,logic circuit of half adder and mention its logic expression
3. State multiplexer and demultiplexer
4. What are edge triggering and level triggering
5. Write about the type of hazards
6. What is decoder
7. Discuss the role of comparator in digital circuits
8. Mention the types of flip-flop
9. Why are shift register considered to be basic memory device
10. List the application of encoder
11. Sketch the block diagram of parallel in serial out shift register
12. What is the difference between combinational circuit and sequential circuit
13. Find 2’s complement for the given binary number a) 10110 b) 101.11001
14. Solve 1011012+101102, 1011012+11102+1102
15. State the differences between 1’s and 2’s complement
16. List any four rules of Boolean algebra
17. Define Demorgan’s Theorem
18. State error and its type
19. Define literal
20. Express the Boolean expression ab c+ab c+abc
21. Find the 2’s complement of 11011010
22. Construct (2.B2)16 to binary number
23. Convert the binary number into hexa decimal (11101100)2 into hexadecimal number
24. Find the 2’s compliment representation of (-23)10
25. Express F=BC+AC in a canonical SOP form
26. Why parity checker is needed
27. Difference between Encoder and Decoder
28. Define programmable logic device
29. What are static and dynamic memories
30. List out the application of ring counter
31. What are synchronous sequential circuits
5 MARK
1. Design a full subractor and implement it using logic gate
2. Implement the following Boolean function with 8:1 multiplexer
F(A,B,C,D)=∑m(0,1,4,8,12,14,15)
3. Explain the realization of JK flip flop from T flip flop
4. Explain the operation of universal shift register with neat block diagram
5. Construct a full adder using two half adder and one OR gate. Verify with its truth
table
6. Realize a JK flip flop using SR flip flop
7. Design a BCD adder using two 4 bit binary adder with its logic diagram and truth
table
8. Draw the logic diagram for SR,JK,D & T flip flops
9. Design a code convertors that converts the BCD code to binary code
10. Explain Mealy and Moore model with an example state diagram
11. Design MOD 5 counter using (i) JK flip flop (ii) D flip flop with its timing diagram
12. Solve the binary number 11001.001011 to decimal
13. Simplify the expression a) Y = A ( B+C A ) +(BC )(B+C A)
b) ( A+ B ) ( A + B+ D ) D
14. Discuss the basic theorems of Boolean Algebra with truth table
15. Examine the IEEE 754 floating point representation using single precision for the
decimal number (163.75)
16. Determine the floating point representation of (-118.625)10 using IEEE 754 single
precision format
17. What is multiplexer ? Construct 4*1 multiplexer with logic gates and truth table
18. Draw the state diagram sequence detector which detects 1101 by considering Mealy
model with one bit overlapping
19. Write the difference between PLA & PAL?
20. Simplify the Boolean function f(A,B,C,D,E)=∑m(0,2,4,6,9,11,13,15,17,21,25,27,29,31)
21. Calculate the decimal number 642 to binary in two ways
I. Convert directly to binary
II. Convert first to hexadecimal, then from hexadecimal to binary
10 MARK
1. Design a 2 bit magnitude comparator with three output A>B., A<B., and A=B and
draw its logic diagram
2. Illustrate the design and procedure of a BCD to excess 3 code convertor with its k-
map and logic diagram
3. Explain the working of MOD 10 asynchronous counter with its state diagram
4. Sketch the logic system for a SR flip flop ,verify different states of the system, truth
table, characteristics table, k-map and excitation table
5. Construct a 4 bit even parity generator
6. Design a code convertors that converts the BCD code to gray code
7. Design a Moore type sequence detector to detect a serial input sequence of 101
8. Explain the working of serial in parallel out shift register with logic diagram and
waveform
9. (i) Design and implement the circuit using multiplexer 8:1 when
F(A,B,C,D)=A’BD’+ACD+B’CD
(ii) implement the function f(w1,w2,w3)=∑m(0,1,3,4,6,7) by using a 3 to 8 binary
decoder and an OR gate.
10. (i)Discuss about the design of 4bit BCD adder with neat diagram and mention how
many adder are used in the BCD circuit
(ii) Difference between synchronous and asynchronous sequential circuit
11. Draw and explain the 4 bit SISO,SIPO,PISO,PIPO and Universal shift register with its
waveform
12. Design a sequential circuit that has 3 flip flop A,B,C ,one input ‘x’ and one output ‘y’.
The circuit is to be displayed by treating the unused state as don’t care condition. Use
JK flip flop in the design. State diagram is given below
13. Assume that the code word 1001100 is transmitted and that 1000100 is received.
The receiver does not know what was transmitted and must look for proper parties
to determine if the code is correct. Designate any error that has occurred in
transmission if even parity is used
14. Explain in brief the error correction and detection codes with hamming code format.
15. Compute the given expression into canonical form F ( A , B ,C , D )= ACD+ A B+ D
and simplify using K map
16. Convert the given expression into canonical form
F ( A , B ,C )=( A+ B+C)( A+ B+C )(A + B+C) and verify it with truth table
17. Draw the logic circuit of decimal to BCD Encoder and explain its working
18. A 9 bit hamming code is received as 1100111. Find error it any Parity checks are
created by odd parity.
19. Implement the following function using PLA F1=∑m(1,2,4,6), F2=∑m(0,1,6,7), F3=Σm
(2,6)
20. Design and implement 3-bit ripple counter using J-K flip-flop. Draw the state diagram,
logic diagram and timing diagram for the same
21. Implement Ex-NOR gate using only NAND gates.
Implement the following Boolean function using only NOR
Y= AC + BC + AB + D
