Madras University (UnOM) 2005 B.Sc Computer Science Digital computer fundamentals & logic - Question Paper

PART A - (10 x three = 30 marks)

ans any TEN ques.. All ques. carry equal marks. every ans should not exceed 50 words.



1. Convert (a) 4FA.1D16 and (b) 721.458 into their binary equivalent values.

2. Write down the 8421 BCD equivalent code for (a) 84510 (b) 37110 (c) 72610

3.Define universal gates.

4.State anyone De Morgan's theorem.

5. How would you obtain the dual of a Boolean theorem?

6.Prove A + AB = A .

7.Simplify A’ B’C’ +A’BC’ +AB’C’ + ABC’

8. Differentiate ranging from a decoder and a demultiplexer.

9. Which logic gate is used to generate even parity bit?

10. Differentiate ranging from sequential and combinational circuits.

11.Define edge triggered flip flops.

12.List any 2 uses of counters.

PART B - (5 x six = 30 marks)

ans any 5 ques.. All ques. carry equal marks. every ans should not exceed 200 words.

13.Reduce the subsequent expression

WXY’ + WX’Y +W’XY’ +WXY + WX’Y’ + W’XY.

14. Perform the subsequent arithmetic in EX-3 (a) 457 + 231 (b) 731 + 896.

15.Explain the working of a half adder.

16.Explain how an encoder is working.

17.Explain (a) D flip flops (b) T-flip flops.

18.Explain how shift registers work.

19.Explain memory addressing.





PART C - (4 x 10 = 40 marks)

ans any 4 ques.. All ques. carry equal marks. every ans should not exceed 500 words.

20. discuss with an example, how to convert a binary number into its equivalent decimal, octal and hexadecimal number.

21. Draw the truth table of a full adder. Simplify the expression for sum and carry terms. Implement the sum and carry using AND-OR gates.

22. discuss with an example, the different representation of negative numbers.

23.Explain the BCD-to-decimal decoder.

24.Explain the working of a 4-bit up-down counter.

25.Explain the working of a mod 10 shift counter.

Earning:   Approval pending.