BIT 1st Semester
Digital Logics Board Question Paper 2078

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BIT 103-2078 ✡
Tribhuvan University
Institute of Science and Technology
2078
✡
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 for as practicable.
The figures in the margin indicate full marks

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

Design a combinational circuit with four inputs and one output. The output is equal to 1 when (i) all the inputs are equal to 1 or (ii) none of the inputs are equal to 1 or (iii) an odd number of inputs are equal to 1.

2.

Implement the following function:
F = ∑(0,1,3,4,5,8,9,10,15) using
i) Decoder
ii) Multiplexer
iii) PLA

3.

What do you mean by race condition in JK Flip Flop and mention the methods to overcome it? Explain Master Slave Flip-flop using JK flip flop with logic circuit, truth table and timing diagram.

Section B

Attempt any Eight questions

[8x5=40]
4.

Convert (1011.110) into decimal and hexadecimal.

5.

Convert (51966.57)₁₀ into octal and hexadecimal number system.

6.

Subtract (111000.110)₂ — (110100.101)₂ using both 2's and 1's complement.

7.

State and prove De-Morgan's Theorems.

8.

Define Half-subtractor with truth table and logic diagram.

9.

What is decoder? Implement 8 x 1 MUX using 4 x 1 MUX.

10.

What is clocked RS flip-flop? Explain with logic diagram and characteristic table.

11.

Design Mod-3 synchronous counter.

12.

Draw a Parallel-In Parallel-Out Shift register and explain it.

13. Write short notes on:
a. Binary parallel adder
b. Jonson counter