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THIRD SEMESTER B.Sc. DEGREE EXAMINATION, NOVEMBER 2015
(CUCBCSS—UG)
Core Course—Computer Science
BCS 3B 04—FUNDAMENTALS OF DIGITAL ELECTRONICS
Three Hours "Maximum : 80 Marks
Part A a

Answer all the questions.

Each question carries 1 mark.
What is meant by a bit ?
What is BCD ?
The AND operation can be produced with two ———— gates.
Name an universal gate.
A half adder is characterized by
What is A.A’C ?
How many flip-flops are required for mod-16 counter ?

inputs and ————— outputs.

Asynchronous counters are also known as

9. A modulus-10 Johnson counter requires how many flip-flops.

10.

i
12.
13.
14.
15.

Define an encoder.
(10 x 1 = 10 marks)
Part B

Answer all the questions.
Each question carries 2 marks.

Convert (101101.01101), to Octal and Hexadecimal number.
Explain the basi¢ properties of Boolean Algebra.
What is a K-map ? What are the limitations of K-map ?
Simplify the expression xyz + xyz' + x’z.
What is a demultiplexer ? Explain.
(5 x 2= 10 marks)

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