Download AKTU B-Tech 3rd Sem 2015-2016 EEC 302 Digital Electronics Question Paper

Printed Pages: 4                                                                                                                    932 EEC-302

(Following Paper ID and Roll No. to be filled in your Answer Book)

Paper ID: 131322                                                                                                                      Roll No.

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B. Tech.

(SEM. III) THEORY EXAMINATION, 2015-16

DIGITAL ELECTRONICS

[Time: 3 hours]                                                                                                                [Total Marks: 100]

SECTION-A

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1. Attempt all sections. All sections carry equal marks. Write answer of each section in short. (2×10=20)

1. Explain Self-Complementing codes with an example.
2. What is the basic difference between Latch and Flip Flop?
3. Perform subtraction using 2s complement: 80-65
4. What are don't care conditions? Explain with example.

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5. Construct 4 to 16 line decoder with five 2 to 4 line decoders with enable.
6. What is the difference between conventional flow-chart and ASM chart?
7. What is the difference between Combinational and Sequential circuits?
8. Convert the following SOP Boolean expression into POS from: ABC+A'B'C
9. Implement a two-bit Magnitude Comparator.

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10. Design a Full adder using two Half adders.

SECTION - B

Attempt any five questions from this section. (10×5=50)

2. Explain J-K flip flop. What is Race-Around condition in J-K flip flop and what is its remedy?
3. Define an encoder. Also describe an 8×3 Priority encoder.

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4. Explain Carry-Look Ahead Generator. Also draw the logic diagram of a BCD Adder.
5. What are Shift Register Counters? Explain in detail.
6. With the help of neat diagram, explain the operations of a Universal Shift Register.
7. What is a multiplexer? Implement the given function with:
   F(A,B,C,D) = ?(0,1,2,3,4,7,8,9,11,14,15)
   1. 8:1 MUX

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   2. 4:1 MUX
   3. 2:1 MUX
8. Find the minimal sum of products for a 5-variable function using Quine Mc-Cluskey (or, Tabulation) method. F = ? m(0, 1, 2, 9, 11, 12, 13, 27, 28, 29)
9. A sequential circuit has two JK flip-flops A and B, two inputs, x and y and one output, z. The flip-flop input equations are:
   

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   JA=Bx+B'y'
   KA=B' xy'
   J-A'x
   KB=A+xy'
   Z=Axy+Bx'y'
   

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   Obtain the logic diagram, state table, state diagram and state equations.

SECTION-C

Attempt any two questions form this section. (15×2=30)

10. What is the difference between Synchronous and Asynchronous Counters? Explain in detail Design a 4-bit Synchronous UP/DOWN Counter.
11. (a) An asynchronous sequential circuit has two internal states and one output. The two excitation functions and one output function describing the circuit are respectively given by:
    

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    Y1 = x1x2 + x1' + x2'
    Y2=x2'+?2'+?1'Y1
    z=x2'+Y1
    (i) Draw the logic diagram of the circuit.
    (ii) Derive the transition table and output map.
    

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    (iii) Obtain a flow table.
    (b) What are Static and Dynamic Hazards?
12. Give the classification of Semiconductor Memories. Implement the following functions with PLA and PAL:
    F1=AB'+AC+A'BC'
    F2 =(AC+BC)'

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