Anna University Chennai DPSD Important Questions

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Anna University Chennai B.E CSE 2nd SEM Digital Principles and System Design (DPSD) Question Paper

1. Define binary logic Binary logic consists of binary variables and logical operations. The variables are designated by the alphabets such as A, B, C, x, y, z, etc., with each variable having only two distinct values: 1 and 0.

2. What is meant by Digital Systems? A digital system is a system that manipulates discrete elements of information that is represented by binary form i.e. 0’s and 1’s.

3. List the number systems i) Decimal Number system ii) Binary Number system iii) Octal Number system iv) Hexadecimal Number system

4. Convert 7368 into an equivalent binary number. The binary equivalents of 7, 3 and 6 are 111,011 & 110 respectively. Therefore 7368 = 1110111102

5. Which gates are called as the universal gates? What are its advantages? The NAND and NOR gates are called as the universal gates. These gates are used to perform any type of logic application.

6. State the sequence of operator precedence in Boolean expression? x Parenthesis x AND x OR

7. What are the different types of number complements? x Radix Complement x Diminished Radix Complement

8. Why complementing a number representation is needed. Complementing a number becomes as in digital computer for simplifying the subtraction operation and for logical manipulation complements are used.

10. What is meant by Map method? The map method provides a simple straightforward procedure for minimizing Boolean function. 11. What is meant by two variable map? Two variable map have four minterms for two variables, hence the map consists of four squares, one for each minterm.

12. State Duality principle. The dual of any Boolean function can be obtained by changing each OR sign to an AND sign and vice versa and complementing any 0 or 1 appearing in the expression.

13. Why parity checker is needed? Parity checker is required at the receiver side to check whether the expected parity is equal to the calculated parity or not. If they are not equal then it is found that the received data has error.

14. What is meant by parity bit? Parity bit is an extra bit included with a binary message to make the number of 1’seither odd or even. The message, including the parity bit is transmitted and then checked at the receiving and for errors.

15. What are the needs for binary codes?
Code is used to represent letters, numbers and punctuation marks.
Coding is required for maximum efficiency in single transmission.
Binary codes are the major components in the synthesis (artificial generation) of speech and video signals. x By using error detecting codes, errors generated in signal transmission can be detected.
Codes are used for data compression by which large amounts of data are transmitted in very short duration of time.

Anna University Chennai B.E CSE 2nd SEM Digital Principles and System Design (DPSD) Question Paper
PART-A


1 Find the octal equivalent of hexadecimal numbers of AB.CD.
2 State and prove the consensus theorem.
3 State the principle of duality.
4 Implement AND gate using only NOR gates.
5 Convert (0.6875)10 to binary.
6 Prove the following using DeMorgan’s Theorm [(x+y)’+(x+y) ‘] ‘=x+y.
7 List the theorems of Boolean algebra.
8 What is Excess-3 code?
9 Compare Gray code and BCD code.
10 What are Universal Gates? Why are they named so?
11 Perform the following code conversions: (1010.10)16 to binary, octal and decimal.
12 Express the following Boolean expression in to minimum number of literals xyz+x’y+xyz’.
13 Can you draw the graph symbol for function F=xy’+x’y.
14 What bit must be complemented to change an ASCII letter from capital to lower case and vice versa?
15 Simplify the following Boolean functions using three variable maps. F(x,y,z)=∑(0,2,3,6,7).
16 Develop or build the following Boolean function with NAND gate F(x,y,z)=(1,2,3,5,7).
17 Distinguish between 1’s and 2’s compliment.
18 What is the concept behind EBCDIC code?
19 What are the limitations of K-map?
20 Design the OR gate using NAND gate.

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Answered By StudyChaCha Member