BIT 1st Semester
Digital Logics Board Question Paper 2083

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BIT 103-2083 ✡

Tribhuvan University

Institute of Science and Technology

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Bachelor Level/First Year/First Semester/Science
Bachelors in Information Technology (BIT 103)
(Digital Logics)
Full Marks: 60 Pass Marks: 24 Time: 3 hours

Candidates are required to give their answers in their own words as far as practicable.
The figures in the margin indicate full marks.

Section A
Long Answer Questions
Attempt any Two questions.
[2x10=20]
1.

What is a parallel binary adder? Design a full adder with truth table, logical expression for output and circuit diagram.

2.

Design a 2-bit synchronous up counter using JK Flip-Flop with state diagram, state transition table, logical expression for input and circuit diagram.

3.

Minimize the following function using K-Map and implement using universal gates: F(A,B,C,D) = Σ(0,2,4,6,8,10,12,14) with don't care condition d(1,3,11)

Section B

Attempt any Eight questions

[8×5=40]
4.

Given A = 63 and B = 57, perform the following:
(a) A – B using 2's complement
(b) A – B using 9's complement

5.

What is Latch? Explain SR Flip-Flop with its characteristic table and equation.

6.

Implement Boolean function F(A, B, C) = Σ(0,2,3,7) using Decoder and PLA.

7.

Why NAND and NOR gates are called Universal gates? Show that all basic gates can be realized using NAND and NOR gates.

8.

Simplify the Boolean expression F = AB + A(B + C) + B(B + C) using Boolean algebra. Implement the simplified expression using basic gates.

9.

What do you mean by shift register? Explain SISO shift register with block and timing diagram.

10.

Design a 2 to 4 decoder using basic gates. Show how two 2-to-4 decoders can be connected to form a 3-to-8 decoder.

11.

What is Encoder? Design a octal to binary encoder.

12.

Write short notes on:
(a) Magnitude Comparator
(b) Half Adder