Annamalai University question paper december 2014

B.Sc. DEGREE EXAMINATION December 2014

(ELECTRONIC SCIENCE)

(THIRD YEAR)

(PART-III)

720. DIGITAL ELECTRONICS

Time: Three hours Maximum: 100 marks

SECTION – A

Answer any FIVE questions

(5×4=20)

1. What is the advantage of using Hexadecimal systems? Covert 7C9 hex to

decimal?

2. Distinguish weighted and non-weighted codes.

3. Find the sum of minterms for function.

f(A,B,C,D)=AC

4. Explain SOP forms expressions.

5. Draw and explain a binary half adder.

6. Write short note on shift registers.

7. Explain the working of T-flip flop.

8. What are the drawbacks of variable resistor D/A convertor?

SECTION – B

Answer any FIVE questions

(5× 16=80 )

9. What are the unique features of Boolean Algebra? State and prove

Demorgan’s theorem for any elements.

10. Implement the following Boolean expression using NAND gate only

i) y = A+ B C+AC and ii) y = (A+ B).( A+C)

11. Explain briefly K-map for four variable switching function with necessary

theory and table.

12. Draw and explain a 2’s complement adder and subtractor.

13. Explain a full subtractor circuit and find out it’s output. Show that how

it is realised using two half subtractors.

14. Draw and explain the working of clocked R-S flip flop using NAND gates.

15. Draw a 4-bit binary ripple counter and explain its working.

16. Explain briefly the binary ladder D/A converter and mention their

advantages.

******

B.Sc. DEGREE EXAMINATION December 2014

(ELECTRONIC SCIENCE)

(THIRD YEAR)

(PART-III)

720. DIGITAL ELECTRONICS

Time: Three hours Maximum: 100 marks

SECTION – A

Answer any FIVE questions

(5×4=20)

1. What is the advantage of using Hexadecimal systems? Covert 7C9 hex to

decimal?

2. Distinguish weighted and non-weighted codes.

3. Find the sum of minterms for function.

f(A,B,C,D)=AC

4. Explain SOP forms expressions.

5. Draw and explain a binary half adder.

6. Write short note on shift registers.

7. Explain the working of T-flip flop.

8. What are the drawbacks of variable resistor D/A convertor?

SECTION – B

Answer any FIVE questions

(5× 16=80 )

9. What are the unique features of Boolean Algebra? State and prove

Demorgan’s theorem for any elements.

10. Implement the following Boolean expression using NAND gate only

i) y = A+ B C+AC and ii) y = (A+ B).( A+C)

11. Explain briefly K-map for four variable switching function with necessary

theory and table.

12. Draw and explain a 2’s complement adder and subtractor.

13. Explain a full subtractor circuit and find out it’s output. Show that how

it is realised using two half subtractors.

14. Draw and explain the working of clocked R-S flip flop using NAND gates.

15. Draw a 4-bit binary ripple counter and explain its working.

16. Explain briefly the binary ladder D/A converter and mention their

advantages.

******

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