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DTEL 211 Trust Academy Networking and PC Engineering Exam III

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Trust Academy exam 3
In collaboration with MSU
Diploma in Telecommunications DTEL
&
Diploma in Networking and PC Engineering DNEP
Final Examination-
DTEL 211: Electronics
Time: 2 Hours
Instructions to candidates
Answer all questions section A. The section carries 40 marks.
In section B answer any three. Each question carries 20 marks.
Question 1
a. Draw the schematic symbol for a zener diode
(2)
b. Explain what is meant by electrical capacitance and define a unit in
which it is measured. (3)
c. Define bridge rectification
(2)
d. Give three examples of transistors (3)
Question 2
aExplain with the aid of labelled circuit diagrams how half wave rectification and full wave
rectification are achieved. (10)
Question 3
a. Explain why power is generated and transmitted as alternating current?
(3)
b. State two uses of semiconductors (2)
c. Explain the flow of current in conductors (3)
d. Define diffusion current (2)
Question 4

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a. Explain the condition when the insulators become conductors (2)
b. Define doping (2)
c. Distinguish intrinsic semiconductors from extrinsic semiconductors (2)
d. Illustrate forward bias and reverse bias with very simple circuits (4)
Question 5
a. Describe the three applications of the bipolar transistor (6)
b. Define the valence band (4)
c. With the aid of a diagram describe the basic construction of the
field effect transistor (10)
Question 6
a. Explain what is meant by the p-n junction (5)
b. Describe and explain how to us a voltmeter to measure
alternating current voltage (5)
c. Define impedance of a circuit (2)
d. Explain what will happen to the brightness of the lamp if the frequency
of the supply is doubled (5)
e. Describe how a transistor may be used as a simple amplifier (3)
Question 7
a. List the four applications of alternating current in industry (5)
b. Explain the three differences between precision and accuracy in a
measurement system (6)
c. State four functions of diodes (4)
d. Define the octal digits and hexadecimal digits (5)
Question 8
a. Describe the use of an operational amplifier as a differentiator (10)
b. Describe the atomic model (10)
Question 9
Distinguish between rms and peak value of an alternating current (4)

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Trust Academy exam 3 In collaboration with MSU Diploma in Telecommunications DTEL & Diploma in Networking and PC Engineering DNEP Final ExaminationDTEL 211: Electronics Time: 2 Hours Instructions to candidates • Answer all questions section A. The section carries 40 marks. • In section B answer any three. Each question carries 20 marks. Question 1 a. (2) Draw the schematic symbol for a zener diode b. Explain what is meant by electrical capacitance and define a unit in which it is measured. c. (2) (3) Define bridge rectification d. Give three examples of transistors (3) Question 2 aExplain with the aid of labelled circuit diagrams how half wave rectification and full wave rectification are achieved. (10) Question 3 a. (3) Explain why power is generated and transmitted as alternating current? b. State two uses of semiconductors (2) c. Explain the flow of current in condu ...
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