BCA 1st Semester
Digital Logics Board Question Paper 2020

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Tribhuvan university

Bachelor In Computer Application

Course Title: Digital Logics

Code No: CACS 103

Semester:I

2020

Full Marks:60 Pass Marks:24 Time:3 hours

Candidates are required to answer the question in their own words as far as possible.

Group A
Group B
Attempt any SIX question.
[6x5=30]
2.

Define Digital Logic. Explain digital signal with its applications, advantages and disadvantages.

3.

Define positional number system. Calculate following:
a) Subtract 21 from 35 using 2's complement method
b) Convert (62.75)₁₀ into single precision floating point format

4.

Define universal gate. Explain Universal gates with their graphical symbol, algebraic expression, truth table, and Venn diagram.

5.

Define Decoder. Explain binary to octal converter with block diagram, truth table and logic diagram.

6.

Simplify the Boolean function F(w, x, y, z) = π(0,2,4,6,8,10,12,14) and don’t care conditions d(w, x, y, z) = π(1,3,9,11) using K-Map method for both SOP and POS form.

7.

Define Multiplexer. Explain 4:1 multiplexer with its block diagram, truth table and logic diagram.

8.

Write short Notes on (any Two):
a) Parallel Adder
b) PLA
c) State Diagram

Group C

Attempt any TWO questions

[2x10=20]
9.

Explain JK and T Flip Flop with their Logic and Diagram, graphical symbol, characteristic table, characteristic equation and excitation table.

10.

Differentiate between asynchronous and synchronous sequential circuits with example. Draw a block diagram, truth table and timing diagram to store 2001 in 4-bit SIPO register.

11.

Define counter. Write a procedure to design a counter circuit. Design MOD-8 up counter.