BIT 1st Semester
Digital Logics Board Question Paper 2080

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BIT 103-2080 ✡
Tribhuvan University
Institute of Science and Technology
2080
✡
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.

Define BCD code. Design BCD to Excess-3 Code converter with truth table and logic diagram.

2.

Define combinational logic circuit. Design a combinational circuit whose input is a four-bit number and whose output is the 1's complement of the input number.

3.

Define parallel counter. Design MOD-12 synchronous up counter along with state diagram, timing sequence and timing diagram.

Section B

Attempt any Eight questions

[8x5=40]
4.

Convert (591.62)₁₀ into hexadecimal and octal number system.

5.

Why NAND and NOR gates are called Universal logic gates? Realize NOR as Universal logic gates.

6.

Simplify: F = X Y Z' + X Z' + X' Y + X" Y Z' using K-Map in both SOP and POS.

7.

Define PLDs. Implement the given functions with ROM.
F1 = ∑(0,1,2)
F2 = ∑(0,2,3)

8.

Describe the clocked master-slave J-K flip-flop with its operation table.

9.

What is forbidden state in SR flip flop? Convert SR to JK flip flop.

10.

Differentiate between ring counter and Johnson counter.

11.

Explain the operation of 4-bit Parallel-In parallel-Out Shift register with data input 1010.

12.

Write short notes on: (Any two)
a. ASCII Code
b. Logic micro operation
c. State table