Download PTU B-Tech EEE 2020 Dec 3rd Sem 72164 Digital Electronics Question Paper

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

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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.

SECTION-A

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Answer briefly :

1. How a negative number is accounted in digital system?
2. Draw a full subtractor using NAND Gate.
3. Draw the logic circuit for the expression AB+ ABC
4. Write down the applications of D flip-flop.

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5. Compare ECL and TTL circuits.
6. Draw the logic diagram for the logic function Z = (A+B).C
7. Write down the characteristic table of D Flip-flop.
8. List the differences between decoder and multiplexer.
9. What do you understand from the term digital counter? How it differs from register?

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10. What is programmable logic array? How it differs from ROM?

SECTION-B

11. Simplify the Boolean function F(w, x,y,z) = S (1, 3, 7, 11, 15), which has the don’t-care conditions d(w, x, y, z) = S (0, 2, 5).
12. Discuss the working of a 4-bit Johnson counter. Also convert SR into JK and D flip-flop.
13. Define the terms resolution and accuracy in context of A/D converter. Also explain the working of parallel A/D converter.

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14. What do you understand by the term programmable logic arrays? Classify and explain different types of memories.
15. Design a 3-bit synchronous down counter using j-k flip flops.

SECTION-C

16. Discuss methods of data representations in VHDL. Also explain decision-controlled structure.
17. Design an ECL NOR gate and explain its operation in details. Also compare the performance of static and dynamic memories in details.

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18. Write a short notes on :
    1. Quine McClusky method
    2. HDL format and syntax

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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