B.Tech. third Sem. info Technology (Branch-VI) Examination-December, 2011

Digital Electronics

Roii No...

24043

B. Tech. 3rd Sem. Information Technology (Branch - VI) Examination - December, 2011

DIGITAL ELECTRONICS

Paper: EE-204-F

Time : Three hours ]___[ Maximum Marks : 100

Before answering the questions, candidates should ensure that they have been supplied the correct and complete question paper. No complaint in this regard, will be entertained after examination.

Note: The students have to attempt first common question which is compulsory, and one question from each of the four remaining Sections. All questions carry equal marks.

1. Answer the following :

{pf 111001111.0011 binary into its octal equivalent.

y

(ii) 1001J. 10ljlll.10001 Binary into hexadecimal.

-(m) Define magnitude comparator.

24043-8,000-(P-4)(Q-9)(11)    p. J. O.

) What are various uses of demultiplexers ?

What are sequential circuits ?

Differentiate between counters and registers.

(vii)    What is Hazards ?

(viii)    Signed binary numbers.

SECTION - A

2. (a) Simplify the given function using Quine Me Clusky method.

F(A, B, C, D) = 0, 2,3,5, 7,11,12,13,14,18,20

(b) Explain error detecting and correcting codes in

detail.

. <- j :

J    '

@ (yJexiiy that NAND and NOR operations are commutative but not associate.

(tSimplify the given function using K-map method

F(A, B, C, D) = 0, 2,3,5,7,11,12,13,14

SECTION - B

4. (a) What is multiplexer? Write down its applications and design a 3*8 multiplexer.

24043-8,000-(P-4)(Q-9)(11)

(b) Describe binary multiplier and encoders. Also write down the applications of encoders.

)(a) Design a combinational circuit that accepts a three-bit number and generates an output binary number equal to the square of the input number.

(b) What is decoder ? Write down its application and construct a 3-to- 8 line decoder.

SECTION - C

6. What are counters ? How do we use them in digital system. Explain asynchronous and module 10 counter with diagrams.

Explain serial in serial out shift registers. Also

explain its different applications.

(b) Draw a logic diagram, truth table and output waveform for a ring counter with four flip flops.

SECTION - D

Discuss reduction of state and flow table in detail with suitable diagrams. Also explain analysis procedure of asynchronous sequential logic.

24043-8,000-(P-4)(Q-9)(11)