Digital Electronics and Logic Circuits (CSCT2202)
Computer Science - COS
Semester: Second Semester
Level: 200
Year: 2015
Page 1
SCHOOL: H.T.T.T.C DEPARTEMENT: CS LECTURER(S): Dr. DADA Jean-Pierre
COURSE CODE: CSC122 COURSE TITLE: Digital electronics and logic circuits OPTION: FCS100
DATE: July 14
th
, 2015 HALL: Amphi 650 TIME: 2 hrs NATURE: Exam
Instructions:…… NA…………..
Exercise 1: Give the logic functions performed by the following schematics (4 marks):
1.1) 1.2)
Exercise 2: Represent logic circuits able to implement the following logic functions (6 marks):
A) 𝑌 = 𝐴 + 𝐶 + 𝐴𝐵
(𝐴 + 𝐵)
B) 𝑌 = 𝐴𝐵
+ 𝐶
+ 𝐴𝐵 + 𝐶
C) 𝑌 = 𝐶𝐵
+ 𝐴𝐵
Exercise 3: The following schemes are Karnaugh tables, simplify the logic functions (6 marks):
3.1) 3.2) 3.3)
Exercise 4 (4 marks): En enterprise wants to recruit engineers for immigration in an American continent.
The Boolean variables chosen are the following:
✓ A=1 if the candidate has at least 3 professional teaching experience years in a school in Cameroon
with a DIPET I diploma.
✓ B=1 if the candidate is fluent in English language.
✓ C=1 when the candidate is a male.
The recruitment center decides to select only males who have DIPET I diploma with at least 3 professional
teaching experience years, or who is a male and is fluent in English.
4.1) Draw the truth table of this logic function for this automatic recruitment (1 mark).
4.2) Simplify this function using Karnaugh table (1 mark)
4.3) Write this function in terms of sum of minterms (1 mark).
4.4) Draw the logigram using the minimum number of possible logic gates (1 mark).
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