Download PTU B.Tech 2020 March EE 4th Sem 57103 Digital Electronics Question Paper

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Roll No. [ ] Total No. of Pages : 02
Total No. of Questions : 09

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B.Tech.(EE)(2012 Onwards)/(Electrical & Electronics Engg.) (2011 Onwards)
B.Tech. (Electronics & Electrical Engg.) (2012 to 2017)
(Sem.-4)
DIGITAL ELECTRONICS
Subject Code : BTEC-404

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Answer briefly :
   1. What is the significance of digital electronics in the modern world? Discuss.
   2. What do you mean by a parity bit? Explain its importance.
   3. Differentiate between multiplexer and an encoder.

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   4. List how Boolean algebra is different from ordinary algebra.
   5. What do you mean by negative logic? Discuss.
   6. Compare RAM and ROM.
   7. What do you mean by race around condition? Explain.
   8. Discuss the significance of D flip-flop.

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   9. List the various characteristics of digital ICs.
   10. List the advantages and disadvantages of counter type A/D converter.

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SECTION-B

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1. Convert the 11101011011.10101 binary numbers to decimal, hexadecimal, octal and Gray code.
2. Draw and explain the circuit for half adder and full adder.
3. Explain the working of a RS flip-flop. Also mention its advantages and disadvantages.
4. For a 5-bit resistive divider D/A converter, determine the following :
   1. The weight assigned to the LSB;
   2. The weight assigned to the second and third LSB;

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   3. The change in output voltage due to a change in the LSB, the second LSB, and the third LSB;
   4. the output voltage for a digital input of 10101. Assume 0=0V and 1 =+ 10 V.
5. It is desired to combine several 1K x 8 PROMS to produce a total capacity of 4K x 8. How Many PROM chips are required? Show the arrangement. Also compare RAM and ROM.

SECTION-C

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1. Discuss the working of parallel and successive approximation type A/D converters.
2. Reduce the expression F(W, X, Y, Z) = ¥m(0,1,5,7,8,10,14,15) to the simplest possible form using Quine-McClusky method and verify it using K- map method
3. Explain the following :
   1. TTL
   2. Decision control structure using VHDL

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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