Semester
Subject
Year
Tribhuwan University
Institute of Science and Technology
2079
Bachelor Level / First Year / First Semester / Science
Bachelors in Information Technology (BIT103)
(Digital Logic)
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 Answers Questions
Attempt any TWO questions.
[2*10=20]
1.
Design a BCD-to Seven-segment decoder to display decimal numbers 1, 2 and 4.[10]
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.[10]
3.
Design a sequential circuit using JK flip-flop with the help of given state diagram.
[10]
Section B
Short Answers Questions
Attempt any Eight questions.
[8*5=40]
4.
Convert $(110.101)_8$ into binary and decimal number system. [5]
5.
Subtract $(739.57)_{10}$ - $(78.35)_2$ using both 10's and 9's complement. [5]
6.
What is magnitude comparator? Design 2-bit magnitude comparator. [5]
7.
Define Half-subtractor with truth table and logic diagram. [5]
8.
What is decoder? Implement 8 x 1 MUX using 2 x 1 MUX. [5]
9.
Design and explain the operational characteristics of D-flip flop. [5]
10.
Design Mod-5 synchronous counter using T- flip flop. [5]
11.
Draw a Serial-In Serial-Out Shift register and explain it. [5]
12.
Write short notes on: (Any two) a. BCD code b. Status Register c. Ring Counter [5]