Digital Electronics BTEC-404 April 2013 PTU B.Tech EE Paper

                            B.Tech. (EE) (Sem.–4) (2011 Batch)

                                DIGITAL ELECTRONICS

   Subject Code : BTEC-404                              Paper ID : [A1207]

                           SECTION-A

   l. Write briefly :

     a) Discuss one application of Gray code.

     b) What is the significance of a truth table? Discuss.

     c) Differentiate between multiplexer and an encoder.

     d) List the advantages and disadvantages of K – map method.

     e) Write down the advantages and disadvantages of successive                                   approximation type A/D converter.
     f) Differentiate between RAM and ROM.

     g) What is a parity bit? Discuss its need.

     h) Differentiate between Boolean algebra and ordinary algebra.

     i) Define Fan-in, Fan-out and unit load with respect to the logic families.

     j) Comment upon the accuracy and resolution of digital to analog converter.

                       SECTION-B

     2. Use the laws of Boolean algebra, to reduce the following expression to                 their simplest form. Name the laws used at each step.
     3. Draw the logic diagram and explain the working of 4 bit synchronous                   down counter.
     4. Explain the working of a SR flip-flop. Also explain how the problems of               SR flip flop are taken care by JK flip flop.
     5. Compare TTL, ECL, MOS and RTL logical families.
     6. What is ROM? Discuss its organization and types in detail.

                      SECTION-C

    7. a) Draw the logic/circuit diagram of Binary ladder D/A converter and                         explain its working.
         b) Draw and explain the working of a counter type A/D converter.

   8. Discuss the following :a) Hamming code for error detection and correction
         b) Decision control structure using VHDL 9. Reduce the expression
        m(0, 2, 3, 10, 11, 12, 13, 16, 17, 18, 19, 20, 21, 26, 27) to the
        simplest possible form using Quine-McClusky method

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                                     SECTION-C

Q3. Attempt any three questions.                                                       3×10=30

  1. Explain OSI Reference model in Details?
  2. What are the various Ethernet electrical specifications?
  3. What do you understand by topology, explain its types and also discuss their advantages and disadvantages?

Application of Gray code.

     

Significance of a truth table

     

Differentiate between multiplexer and an encoder.

     

Advantages and disadvantages of K – map method.

     

Advantages and disadvantages of successive                      approximation type A/D converter.
     

Differentiate between RAM and ROM.

     

Parity bit and its need.

     

Differentiate between Boolean algebra and ordinary algebra.

     

Fan-in, Fan-out and unit load with respect to the logic families.

    

Accuracy and resolution of digital to analog converter.

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Digital electron ics 4th sem B.TECH PTU QUESTION PAPER              

Draw the logic/circuit diagram of Binary ladder D/A converter
         

Explain the working of a counter type A/D converter.

   

Hamming code for error detection and correction
         

Decision control structure using VHDL 

 Reduce the expression  m(0, 2, 3, 10, 11, 12, 13, 16, 17, 18, 19, 20, 21, 26, 27) to the simplest possible form using Quine-McClusky method

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