General Electronics: Electro-Physics (CSCT2112)
DIPET 1 in ICT - ICTT
Semester: First Semester
Level: 200
Year: 2019
REPUBLIC OF CAMEROON THE UNIVERSITY OF BAMENDA
Peace – Work – Fatherland P.O. BOX 39 Bambili
FIRST SEMESTER EXAMINATION
SCHOOL: HTTTC DEPARTMENT: Computer Science OPTION: ICT
COURSE CODE: CSCT2112 COURSE TITLE: General Electronics: Electro-physics
LECTURER: Mr. FOHAGUI CREDIT VALUE: 3
DATE: 19/03/2019 TIME: 1h30 START: 7:30AM END: 9:00AM
Instructions: Answer all the questions
Exercise 1 (20 marks):
A simple low pass filter having a cut-off frequency of 1𝑘𝐻𝑧 is connected to a constant AC source of
10𝑉 with variable frequency calculate the following :
a) Value of C if 𝑅 = 10𝑘Ω
b) Output voltage and its decibel level when 𝑓 = 𝑓
𝑐
Exercise 2 (30 marks):
This problem illustrates how a unity feedback amplifier is used to avoid loading effects. Consider the
divider circuit in the Figure (a). What is 𝑉
𝑜𝑢𝑡
? Assume we want to apply 𝑉
𝑜𝑢𝑡
across a 1𝐾Ω resistor as
shown in part (b). What is 𝑉
𝑜𝑢𝑡
now?
Now assume we place a buffer amplifier between the divider and 1𝐾Ω resistor as in part (c). Find 𝑉
𝑜𝑢𝑡
Exercise 3 (20 marks):
Consider the following amplifier (fig 1), determine the expression of V
B
, I
C
, I
E
Fig 1:
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