BIT 1st Semester
Digital Logics Board Question Paper 2077

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BIT 103-2077 ✡
Tribhuvan University
Institute of Science and Technology
2077
✡
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.

2.

Define combinational logic circuit. Design a combinational circuit whose input is a four-bit number and output is 2's complement of the input number.

3.

What is ring counter? Explain ring counter with diagram, timing sequence and timing diagram.

Section B

Attempt any Eight questions

[8x5=40]
4.

Convert (1011 110) into decimal and hexadecimal.

5.

Substract (1001.11 - 1010.10) using 2's and 1's complement.

6.

Express the given function in sum of minterms.
F = y'z + wxy' + wzx' + w'x'z'

7.

Simplify the Boolean function using don't care conditions d, In sum of products and product of sums form.
F(A, B, C, D) = π(1,3,7,8,12) and πd(5,10,13,14)

8.

Implement a full subtracter with two half subtractors and one OR Gate.

9.

Define SR latch with logic diagram and truth table.

10.

Compare the logic of synchronous counter and ripple counter.

11.

Define shift register with its types.

12.

Write short notes on:
a) Parity generator
b) State diagram