Digital Logic 2068

Long Answer Questions:

Attempt any TWO questions. (2x10=20)

1. Draw a block diagram, truth table and logic circuit of 1x16 Demultiplexer and explain its working principle.

2. Design a 3 bit synchronous counter and explain it.

3. What is magnitude comparator? Design a logic circuit for ₄ bit comparator and explain it.

Short Answer Questions:

Attempt any EIGHT questions. (8x5=40)

4. Design a half subtractor circuit using only NAND gates.

5. Convert the following decimal numbers into Hexadecimal and Octal numbers:

(a) 504

(b) 250

6. Design an encoder using universal gates.

7. What do you mean by D-flip-flop?

8. What is sequential logic? What are the important features?

9. Simplify the Boolean function using K-Maps.

F = X’yz + X’yz’ +Xy’z’ +Xy’z

10. Draw a parallel-parallel-out shift register and explain it.

11. Explain the 4 bit ripple counter.

12. Explain the programmable logic array.

13. Write short notes on :

(a) Asynchronous counter

(b) Multiplexers

(c) State reduction table