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THIRD SEMESTER B.Sc. DEGREE EXAMINATION, NOVEMBER 2017

(CUCBCSS—UG)
Computer Science
BCS 3B 04—FUNDAMENTALS OF DIGITAL ELECTRONICS

: Three Hours - ١ Maximum : 80 Marks

Part A

Answer all questions.
Each question carries 1 mark.

A hexadecimal number ‘AO’ has the decimal value

Half adders consist of —————— and —-————_ Gates.
8421 codes is also called as
map technique generally used up to —————— Variables.

The Boolean function Y = AB + CD is to be realised using only 2-input NAND gates. The minimum
number of gates required is

Define Associative Laws of Boolean algebra.
How many flip flops are in need to build 8-bit register ?
Synchronous Counters are —-———— than ripple counter.
The need for the master slave configuration of JK flip flop is
A Sequential Circuit which does not have input clock pulse then it is called
(10 x 1 = 10 marks)
Part B

Answer all questions.
Each question carries 2 marks.

What is an XOR gate ? Give the truth table and logic symbol.
Define minterm and maxterm.
Mention the two application of D Flip Flop.
Explain with a neat logic diagram 4 : 1 MUX.
What are excess 3 codes ?
| (5 x 2 = 10 marks)

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