Maharashi Dayanand University (MDU) 2011 B.Tech Computer Science and Engineering Digital Electronics - Question Paper
B.Tech. third Sem. info Technology (Branch-VI) Examination-December, 2011
Digital Electronics
Note: The students have to attempt first common ques. which is compulsory, and one ques. from every of the 4 remaining parts. All ques. carry equal marks.
Roii No...
B. Tech. 3rd Sem. Information Technology (Branch - VI) Examination - December, 2011
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.
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
4. (a) What is multiplexer? Write down its applications and design a 3*8 multiplexer.
24043-8,000-(P-4)(Q-9)(11)
(2)
(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.
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.
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)
P. T. O.
(3)
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