Download PTU B.Tech 2021 Jan Software Engineering 3rd Sem 78674 Digital Electronics Question Paper

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Total No. of Questions : 18

Total No. of Pages : 02

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B.Tech. (Software Engineering) (Sem.-3)

DIGITAL ELECTRONICS

Subject Code : BTES-301-18

M.Code : 78674

Time : 3 Hrs.

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Max. Marks : 60

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

Write briefly :

1. Draw the logic symbol and truth table of XNOR gate.
2. Write down the significance of excess-3 code.
3. What do you mean by ASCII? Explain.

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4. Compare Boolean algebra and ordinary algebra.
5. Draw the logic symbol and truth table of D Flip Flop.
6. Differentiate between edge and level triggering.
7. Differentiate between synchronous and asynchronous counters.
8. What do you mean by resolution and accuracy of D/A converters? Explain.

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9. Compare RAM and ROM.
10. Discuss the significance of sample and hold circuit.

SECTION-B

1. Convert 357.24 octal number to decimal number, hexadecimal and binary.
2. Two 4 bit BCD numbers A0 A1 A2 A3 and B0 B1 B2 B3 are required to be added, resulting in a BCD number. What modifications/alterations are required to be made in the circuit of 4-bit binary adder? Discuss. Mention clearly the assumptions made, if any.

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13. For a 5-bit resistive divider, determine the following :
    1. The weight assigned to the LSB;
    2. The weight assigned to the second and third LSB;
    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 = 0 V and 1 = + 10 V.

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14. To issue an insurance policy an applicant must fulfil the following requirements. The applicant must be:
    • A married female 25 years old or over, or
    • A female under 25, or
    • A married male under 25 who has not been involved in a car accident, or
    • A married male who has been involved in a car accident, or
    • A married male 25 years or over who has not been involved in a car accident.

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    Find the logical expression which assumes a value 1 whenever the policy is issued. Realize the circuit using the minimum number of gates.
15. Draw the K-map of the following expression and obtain the minimal SOP form. The expression is ABCD+AC+CD+ABC+ABC

SECTION-C

16. Draw the logical circuit diagram and explain the working of successive approximation and dual slope analog to digital convertors.
17. Design a MOD-9 synchronous counter using T and JK flip flops.

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18. Explain :
    1. Shift registers
    2. NAND and NOR as universal gates

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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