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BASIC ELECTRONICS.pdf
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UNIVERSITY OF SWAZILANDMAIN EXAMINATION, SECOND SEMESTER MAY 2013
FACULTY OF SCIENCE AND ENGINEERING
DEPARTMENT OF ELECTRICAL AND ELECrRONIC ENGINEERING
•
TITLE OF PAPER: BASIC ELECTRONICS
COURSE NUMBER: EE221
TIME ALLOWED: THREE HOURS
I
INSTRUCTIONS:
1. There are five questions in this paper. Answer any FOUR questions.
2. Each question carries 25 marks.
3. Marks for different sections are shown on the right hand margin.
4. If you think: not enough data has been given in any question you may assume any reasonable
values.
5. A sheet containing useful formulae and other information is attached at the end.
THIS PAPER IS NOT TO BE OPENED UNTIL PERMISSION HAS
BEEN GIVEN BY THE INVIGILATOR
TIDS PAPER HAS SEVEN (7) PAGES INCLUDING TIDS PAGE
, EE221 BASIC ELECTRONICS Page2of7
QUESTION 1 (25 marks)
(a) A diode has a forward voltage drop of 0.7 when conducting 1 rnA of current at room
temperature. When this diode is connected to the circuit shown in Fig. Q la, the
forward voltage drop changes to 0.74 V. Assuming that the temperature stays constant
and that n = 1.
(i) Find the value diode current when the forward voltage drop is 0.74V.
(8 marks)
(ii) Find value of the resistor R used in the circuit. (2 marks)"
-=-9 V
Fig. Qla
(b) The current in a diode is increased by a factor of 4 (quadrupled). By how much will its
forward voltage drop change? (5 marks)
(c) In Fig.Ql.c assume that the diodes are ideal. Find the currents in all the resistors and
all the diodes. Hint: First detenmne which diodes are forward biased. (10 marks)
R1
2kQ D2
R2
-=-5 V
1k11
R3
5()(Xl
Dl D3
Fig. Ql.c
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