B.Sc. Honours Computer Science Major
Model Question Paper
Semester II
Course 4
Digital Logic Design
Section – A
Answer any FIVE of the following 5 × 4 = 20 marks- Explain how to represent signed binary numbers.
- Distinguish between weighted and non-weighted codes with example.
- Draw the logic symbol and write the truth table for:
a) AND gateb) OR gate
- What are minterms and maxterms? Give examples for each.
- Write about a combinational circuit.
- What is a decoder? Give an example.
- Write short notes on priority encoder.
- Differentiate between a latch and a flip-flop.
Section – B
Answer any FIVE of the following 5 × 10 = 50 marksUNIT — I
9. (a)Convert the following:
- i) (53.625)10 to ( ? )2
- ii) (4095)10 to ( ? )16
- iii) (2D7)16 to ( ? )8
- iv) (777)8 to ( ? )2
OR
9. (b)Find the 1’s and 2’s complements of the following 8-digit binary numbers:
- i) 10101110
- ii) 10000001
- iii) 10000000
- iv) 00000001
- v) 00000000
UNIT — II
10. (a)Simplify the following Boolean functions using a three-variable K-map:
- a) F(x, y, z) = Σ(0, 1, 5, 7)
- b) F(x, y, z) = Σ(0, 1, 2, 3, 6, 7)
OR
10. (b)Describe the postulates and theorems of Boolean algebra.
UNIT — III
11. (a)Define half-adder. Design a half-adder using logic gates.
OR
11. (b)What is a full-adder? Implement a full-adder using two half-adders and one OR gate.
UNIT — IV
12. (a)What is a multiplexer? Implement the Boolean function F(A, B, C) = Σ(1, 3, 5, 6) with a multiplexer.
OR
12. (b)Draw the logic diagram of a 2:4 decoder with an ENABLE input using:
- i) NAND gates
- ii) NOR gates
UNIT — V
13. (a)Explain the operation of an RS flip-flop with a logic diagram.
OR
13. (b)Explain the operation of a JK flip-flop with a logic diagram.
Digital Logic Design — Model Question Paper · B.Sc. Computer Science, Semester II
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