Rajasthan Technical University 2009-4th Sem B.E Electrical Engineering : (- ) Digital Electronics - Question Paper
Rajasthan tech. University(RTU)
B.Tech IV sem. back exam
2009
Digital Electronics
The candidate should ensure that this question
paper contains 3 printed pages.
4177 Dig. Elect.
II B.E. (IV SEMESTER) (BACK) EXAMINATION, 2009
(New Four Year Semester Scheme)
[Branch : Electrical Engineering]
Paper II DIGITAL ELECTRONICS
Time Allowed : Three Hours Maximum Marks 80
(1) No supplementary answer-book will be given to any candidate. Hence the candidates should write the answer precisely in the Main answer-book only.
(2) All the parts of one question should be answered at one place in the answer-book. One complete question should not be answered at different places in the answer-book.
Turn over'
Attempt any five questions. All questions carry equal marks.
1. Convert the following:
(a) (1101:11)2 to decimal
(b) (198) 12 to decimal
(c) (725) 10 to binary
(d) (2AC5.D)16 to decimal.
2. A combinational circuit has 4 inputs and-one output, the output is equal to 1 when all inputs are equal to 1 or none of the inputs are equal to 1 or an odd number of inputs is equal to 1.
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(a) |
Obtain the truth table. |
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(b) |
Find the simplified output in POS form. |
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(c) |
Draw the logic diagram. |
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3. Simplify the expression y given below: | |
|
(a) |
yi=B(A+B)(B+C) |
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(b) |
y2=A [B+C (AB+AC)] |
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(c). |
y3{A+B'C) (AB+ABQ |
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(d) |
y4 AB (A+C) +AB(A +5+C). |
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4. (a) |
What are the different types of logic families? Give a comparison of different families with |
regard to speed, power dissipation, noise margin, fan in and fan out.
(b) Explain the working of CMOS inverter.
5. (a) Design a BCD to excess-3 encoder.
(b) What are the different types of flip-flops? Give the details.
6. (a) What is race around condition? Give the solution
to this problem in flip-flops.
(b) Design a ripple counter using J-K flip-flop.
7. (a) Design and explain the Half adder circuit.
(b) Show with the example of Radix and radix conversion.
8. Write short notes on any two:
(a) Error detecting and correcting codes
(b) Shift register
(c) Diode switching matrix
(d) Quine-McClusky technique.
4177
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Attachment: |
| Earning: Approval pending. |
