Download PTU B-Tech EEE 2020 Dec 4th Sem 57103 Digital Electronics Question Paper

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Roll No. Total No. of Pages : 02
Total No. of Questions : 18

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B.Tech. (EE) (2012 Onwards) / (Electrical & Electronics Engg.) (2011 Onwards)
B.Tech. (Electronics & Electrical Engg./ Electrical Engineering & Industrial Control) (2012 to 2017) (Sem.-4)
DIGITAL ELECTRONICS
Subject Code : BTEC-404
M.Code : 57103

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

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SECTION-A

Answer briefly :

1. Convert the following numbers to octal :
   1. (365)₆
   2. (22.64)₁₀
   3. (11011.1100)₂

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   4. (101)₂
2. Convert the following gray code to binary:
   1. 100101
   2. 11111

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3. State DeMorgan’s First theorem
4. What is meant by Latch?
5. Define the following terms regarding a logic family :
   1. Noise Margin
   2. Propagation delay

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6. Draw the truth table of T Flip flop.
7. Which of the following language can describe the hardware?
8. Why do we need HDL?
9. What are the facts of behavioral description?
10. What are the file processing tasks in VHDL? Name them.

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SECTION-B

11. What are the different types of codes used in digital systems? Explain them.
12. Implement the following Boolean function using 8:1 multiplexer.
    f(A,B,C,D)= ABD+ ABC + BCD + ACD
13. Compare the flash type, successive approximation and dual slope A/D converters.

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14. How does an edge triggered JK FF avoid race around condition?
15. What is the difference between synchronous and asynchronous counter?

SECTION-C

16. Find the minimal expression for the following function using Quine-McCluskey method.
    f(A,B,C,D)= S m(0,1,4,6,8,9,10,12)+d (5,7,14)

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17. A combinational circuit is defined by the function
    F(A,B,C,)= S m(4,5,7) F(A,B,C,) = S m(3,5,7)
    Implement this circuit with a PLA having 3 inputs, 3 product terms and 2 outputs.
18. Compare the performance of TTL, CMOS and ECL logic.

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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