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# 2014 Acharya Nagarjuna University II/IV B.Tech - Semester 1 - Digital Electronics - Bapatla Engineering College - January 2014 Question paper

 Course: University/board: Acharya Nagarjuna University

Are you searching for the old question papers of Digital Electronics - Bapatla Engineering College - B.Tech? This is the original question paper from the B.Tech second year first semester exam conducted by Bapatla Engineering College in January 2014. Feel free to make a copy and use it to prepare for your upcoming exams.

II/IV B.Tech Degree Examinations, January 2014

First Semester

Digital Electronics

Time : 3 hours

Maximum Marks : 60

Answer ONE question from each Unit

1. Answer the following [12 x 1 = 12M]
a) Convert (1010)2 to Gray code?
b) Subtract the decimal 649-387 using 9's complement method?
c) Expand EBCDIC?
d) Simplify the Boolean expression xyz+x'y+x'y'z?
e) Why NAND and NOR gates are called universal gates?
f) The min terms of the K-map are arranged using which code?
g) Differentiate a decoder and a demultiplexer?
h) What is a state table?
i) What do you mean by synchronous counter?
j) What are the advantages of ECL logic family?
k) How many number of flip-flops are required for Mod-16 ring counter?
l) What is the width of the address bus of a Rom of size 1024x8 bits?

UNIT - I [1 x 12 = 12M]

2. a) Find the value of x in the following?
i) (1256)8=(x)2
ii) (1776)10 = (x)6.
2. b) Convert the following to Decimal and then to Binary?
i) (1234)16
ii) (1726)8
2. c) Represent the following in both ASCII and EBCDIC codes?
i) NRI
ii) BEC (OR)
3. a) List the truth tables of the following functions and also realize them using logic gates?
i) F = xy + x'y + y'z + yz
ii) F= x'y'z' + x'yz + yyz'
3. b) If the hamming code sequence 1100110 is transmitted and due to error in one position, it is received as 1110110. Locate the position of the error bit using parity checks and give the method for obtaining the correct sequence?

UNIT - II [1 x 12 = 12M]

4. a) Reduce the following function using K-map and identify the prime implicants and essential prime implicants?
F(A, B, C, D) = Σm(0, 1, 2, 3, 6, 7, 13, 15)
4. b) What is encoder? What are the advantages of priority encoder over Encoder? (OR)
5. a) Minimize the following function using Tabular minimization and verify the same using K-map simplification?
F (A, B, C, D) = Σm(0, 1, 2, 5, 7, 8, 9, 10, 13, 15)
5. b) Draw the logic diagram of programmable Logic array and explain its operation in brief?

UNIT - III [1 x 12 = 12M]

6. a) Design and draw a 4-bit ring counter using D flip-flops and draw the timing diagrams also?
6. b) Draw the circuit diagram of serial adder? Obtain its state table and state diagram? (OR)
7. a) Design a synchronous counter with the following sequence 0, 1, 2, 4, 6 and repeat using JK flip-flops?
7. b) Draw and explain 4-bit universal shift register?

UNIT - IV [1 x 12 = 12M]

8. a) Compare various Logic Families?
8. b) Explain the working of CMOS NOR gate? (OR)
9. a) Draw and explain the operation of open collector TTL NAND gate?
9. b) Draw the ECL gate and explain its working?

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