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DTEL 211 Trust Academy Networking and PC Engineering Exam I

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Trust Academy exam 1
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
1. Answer all questions section A. The section carries 40 marks.
2. In section B answer any three. Each question carries 20 marks.
Question 1
a. Explain the difference between a conductor and a semiconductor (2)
b. State any two uses of a semiconductor (2)
c. The word L.E.D stands for? (2)
d. Define drift current (2)
e. Explain the reason for doping semiconductors and not conductors (2)
Question 2
a. Differentiate between the two classes of semiconductors (2)
b. Describe the formation of a PN junction (4)
c. Describe the configuration of a diode (4)
Question 3
a. State three practical applications of a diode (3)
b. List two precautions to bear in mind when working with diodes (2)
c. Describe the construction of a Darlington transistor (4)
d. Give one practical use of a transistor (1)

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Question 4
a. Explain the importance of transistor models in Electronics (3)
b. Explain the ideal amplifier approximation (2)
c. Define rectification (2)
d. State one application of Electronics in industry (1)
Section B. Answer any three questions in this section. Each question carries 20 marks.
Question 5
a. List three advantages of octal numbers system to binary number system (3)
b. Describe the binary numbers signal representation (6)
c. By considering electron energy levels in a solid, distinguish between conductors ,
insulators and semiconductors (4)
d. Discuss the effect of adding different types of impurities to semiconductors (5)
e. Define a thermistor (2)
Question 6
a. Explain what is meant by a p- and a n- semiconductor (4)
b. Explain briefly how a p- and n- semiconductors are made
c. Explain the condition when the insulators become conductors (2)
d. Define doping (2)
e. Give five ways to prepare the soldering iron (5)
f. State one use of a zener diode (1)
Question 7
a. Give a brief account of electrical conduction in solids pointing out the basic differences
between insulators, conductors and semiconductors (10)
b. Explain why power is generated and transmitted as alternating current? (4)
c. State two uses of semiconductors (2)
d. Explain the flow of current in conductors (2)
e. Define diffusion current (2)
Question 8
a. Define soldering (2)
b. Explain the use of bridge rectifier for rectification (8)

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Trust Academy exam 1 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 1. Answer all questions section A. The section carries 40 marks. 2. In section B answer any three. Each question carries 20 marks. Question 1 a. b. c. d. e. Explain the difference between a conductor and a semiconductor State any two uses of a semiconductor The word L.E.D stands for? Define drift current Explain the reason for doping semiconductors and not conductors (2) (2) (2) (2) (2) Question 2 a. Differentiate between the two classes of semiconductors b. Describe the formation of a PN junction c. Describe the configuration of a diode (2) (4) (4) Question 3 a. b. c. d. State three practical applications of a diode List two precautions to bear in mind when working with dio ...
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