Annamalai University 2008-3rd Year B.Sc Electronics " 720 DIGITAL " ( - IV ) ( PART - III - A - MAIN ) ( ) 5256 - Question Paper
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Name of the Candidate :
5 2 5 6 B.Sc. DEGREE EXAMINATION, 2008
(ELECTRONIC SCIENCE)
(THIRD YEAR)
(PART - III - A - MAIN)
(PAPER - IV)
December ] [ Time : 3 Hours
Maximum : 100 Marks
PART - A (5 x 4 = 20)
Answer any FIVE questions.
All questions carry equal marks.
1. Draw the truth table for a three input NAND gate.
2. Write a note on hexadecimal number.
3. Explain the use of Karnaugh maps.
4. Write a brief note on SOP forms of expressions.
5. Give a circuit of a half subtractor and explain its function.
6. Explain the working of a R-S flip flop.
7. What is a ring counter/ Explain its working.
8. What is DAC ? Explain the characteristics of a DAC.
Answer any FIVE questions.
All questions carry equal marks.
9. State and prove De-Morgans theorems. Realize the two De-Morgans theorems using logic gates.
10. With the truth table explain the function of the following logic gates:
(i) AND gate.
(ii) OR gate.
(iii) NOR gate.
(iv) NOT gate.
(v) XOR gate.
11. Construct a K-map for the sum output of a full adder and reduce it. Also, draw the logical diagram of the reduced expressions.
12. Draw the circuit of a
(i) half-adder and (ii) full adder.
Explain their working with the truth table.
13. What is demultiplexer ? Discuss its working with a block diagram.
14. Give the circuit of
(i) J - K flip-flop and
(ii) T flip-flop.
Explain the working with truth table.
15. Discus the function of a shift register and explain how a 4-bit number 1101 is shifted. Represent the shifting by the truth table.
16. Draw the circuit of a binary ladder D/A converter and explain its working.
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