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Sct 103: Electronic Devices And Circuits Question Paper
Sct 103: Electronic Devices And Circuits
Course:Computer Science
Institution: Kenyatta University question papers
Exam Year:2010
KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2010/2011
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE (COMPUTER SCIENCE)
SCT 103:
ELECTRONIC DEVICES AND CIRCUITS (NEW)
DATE: Monday, 22nd November, 2010
TIME: 8.00 a.m. – 10.00 a.m.
------------------------------------------------------------------------------------------------------------
INSTRUCTIONS:
Answer question ONE and any other TWO questions.
QUESTION ONE
a)
Explain what a P-N junction is and how it is formed, clearly illustrating the
biasing
(3 marks)
b)
Discuss a brief theory of the following:
i)
P-N junction diode
(3 marks)
ii)
Bipolar junction transistor
(3 marks)
iii)
Field effect transistor
(3 marks)
iv)
Operational amplifier
(3 marks)
v)
Comparison on Analog to digital and Digital to analog converters
(4 marks)
vi)
Using a well labeled circuit diagram, discuss the functionalities of a Wien
bridge oscillator.
(6 marks)
c)
List and explain the characteristics of the two mainly used semiconductor doping
material
(4 marks)
d)
Differentiate between oscilloscopes and multi-meters
(1 mark)
Page 1 of 3
QUESTION TWO
a)
Using a well-labeled diagram, discuss the biasing of a PNP and NPN transistor
(6 marks)
b)
Draw an output characteristic of a transistor, and use a load line to illustrate how a
transistor is used as an amplifier
(6 marks)
c)
Differentiate between the following types of Field Effect Transistors:
i)
MOSFET
(2 marks)
ii)
MESFET
(2 marks)
iii)
IGBET
(2 marks)
iv)
JFET
(2 marks)
QUESTION THREE
a)
Use a circuit diagram, and an expression to show how an operational amplifier
achieves the following function:
i)
Adding
(4 marks)
ii)
Subtracting
(4 marks)
iii)
Comparator
(4 marks)
b)
With an aid of a circuit diagram and a flow chart, explain how a Successive
Approximation Analog to Digital Converter (ADC) functions.
(8 marks)
QUESTION FOUR
a)
When using a oscilloscope, it was realized that the displayed signal amplitude is
of low magnitude, and the signal was not stable. What two variables would be
used to solve this problem
(6 marks)
b)
You are training a technician to use a multi-meter. Which three precautions
would you advice the technician to observe while using the multi-meter?
(3 marks)
c)
List and explain any FIVE characteristics of an ideal operational amplifier
(5 marks)
d)
Using well labeled diagrams, differentiate between a high pass filter and a low
pass filter
(6 marks)
Page 2 of 3
QUESTION FIVE
a)
With an aid of a bias arrangement for N-channel JFET, explain the biasing and
the operation of a JFET
(6 marks)
b)
Draw the JFET output characteristics, clearly showing the ohmic, saturation, cut-
off and break-down regions.
(6 marks)
c)
With an aid of a circuit diagram, and a mathematical expression, explain how an
operational amplifier is used as:
i)
Differential amplifier
(4 marks)
ii)
Integrator
(4 marks)
Page 3 of 3
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