Digital Logic and Computer Design 2013 – BSc Computer Science Part 1

Paper Code: 1305
1505 (Computer Science) (Part 1)
Examination, 2013
Paper No. 2.2

Time: Three Hours] [Maximum Marks: 33


Note: Attempt any five questions. All questions carry equal marks.

1. (a) Convert the decimal number to the base indicated:

  1. 175 to octal
  2. 2479 to hexadecimal
  3. 255 to binary

(b) Explain the open of clocked RS flip-flop.

2. (a) Draw the logic diagram and its truth table of half adder.

(b) Describe the PLA control method of designing a control unit.

3. (a) Write a short note about the various digital logic families.

(b) Obtain the complement of the following Boolean expressions:

  1. latex]AB+A(B+C)+B^{‘}(B+D)[/latex]
  2. latex]A+B+A^{‘}B^{‘}C[/latex]

4. (a) Explain the following:

  1. Explain the difference between asynchronous and synchronous sequential circuit.
  2. Define fundamental-mode operation.
  3. Explain the difference between stable and unstable states.
  4. What is the difference between an internal state and a total state.

(b) Explain the critical and non-critical races with the help of examples.

5. (a) Implement half adder using 4 NAND gates.

(b) Implement full sub tractor using NAND gates only.

6. Explain about analysis of clocked sequential circuits in details.

7. (a) Design a serial adder in shift registers.

(b) Write a HDL behavioural description of shift register.

8. (a) Convert the following number with indicated bases to decimal:

  1. (101111)_{2}
  2. (A3B)_{16}
  3. (237)_{8}
  4. (43)_{5}

(b) Obtains the 1’s and 2’s compliment of the following binary numbers:

  1. 11101010=
  2. 01111110=
  3. 10000000=
  4. 00000000=

9. (a) Implement the following Boolean algebra using AND, OR and Inverter gates:

(b) Using the rules of Boolean algebra, simplify the expressions that follow to the fewest total number of literals:

  2. F=B+AD+BC+[B+A(C+D)]

10. (a) Explain the working of 4-bit asynchronous counter.

(b) Explain the design of Arithmetic Logic unit.


Lokesh Kumar

Being EASTER SCIENCE's founder, Lokesh Kumar wants to share his knowledge and ideas. His motive is "We assist you to choose the best", He believes in different thinking.

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