BIT 1st Semester
Digital Logics Board Question Paper 2079

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BIT 103-2079 ✡
Tribhuvan University
Institute of Science and Technology
2079
✡
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 BCD-to Seven-segment decoder to display decimal numbers 1, 2 and 4.

2.

What are the drawbacks of clocked RS flip flop? Explain the operation of a JK flip flop along with its characteristic table, characteristic equation circuit diagram and timing diagram.

3.

Design a sequential circuit using JK flip-flop with the help of given state diagram. sequential circuit using JK flip-flop

Section B

Attempt any Eight questions

[8x5=40]
4.

Convert (110.101)8 into binary and decimal number system.

5.

Subtract (739.57)₁₀— (78.35)₂ using both 10's and 9's complement.

6.

What is magnitude comparator? Design 2-bit magnitude comparator.

7.

Define Half-subtractor with truth table and logic diagram.

8.

What is decoder? Implement 8 × 1 MUX using 2 × 1 MUX.

9.

Design and explain the operational characteristics of Dflip flop.

10.

Design Mod-5 synchronous counter using T- flip flop.

11.

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

12.

Write short notes on: (Any two)
a. BCD code
b. Status Register
c. Ring Counter