Digital Logic 2079

Section A

Long Answer Questions
Attempt any TWO questions. [2 × 10 = 20]

1. Design a BCD-to Seven-segment decoder to display decimal numbers 1, 2 and 4. [10]

2. What are the drawbacks of clocked RS flip flop? Explain the operation of a JK flip flop along with its characteristic table, characteristic equation circuit diagram and timing diagram. [2+8]

3. Design a sequential circuit using JK flip-flop with the help of given state diagram. [10]

Section B

Short Answer Questions
Attempt any EIGHT questions. [8 × 5 = 40]

4. Convert (110.101)8 into binary and decimal number system. [2.5+2.5]

5. Subtract (739.57)_10 - (78.35)_2 using both 10's and 9's complement. [2.5+2.5]

6. What is magnitude comparator? Design 2-bit magnitude comparator. [1+4]

7. Define Half-subtractor with truth table and logic diagram. [5]

8. What is decoder? Implement 8 × 1 MUX using 2 × 1 MUX. [1+4]

9. Design and explain the operational characteristics of D flip flop. [5]

10. Design Mod-5 synchronous counter using T-flip flop. [5]

11. Draw a Serial-In Serial-Out Shift register and explain it. [5]

12. Write short notes on: (Any two) [2.5 × 2 = 5]

• a. BCD code
• b. Status Register
• c. Ring Counter