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Electrical and Electronic Technology 1
CARIBBEAN EXAMINATIONS COUNCIL
REPORT ON CANDIDATES WORK IN THE
CARIBBEAN ADVANCED PROFICIENCY EXAMINATION
MAY/JUNE 2007
ELECTRICAL & ELECTRONIC TECHNOLOGY
Copyright © 2007 Caribbean Examinations Council ®
St Michael Barbados
All rights reserved 2
ELECTRICAL & ELECTRONICS TECHNOLOGY
CARIBBEAN ADVANCED PROFICIENCY EXAMINATION
MAY/JUNE 2007
GENERAL COMMENTS
Sixty-one candidates registered for Unit 1 and 61 candidates registered for Unit 2 in this examination. All
candidates who registered for Unit 1 sat Paper 02, whereas 59 sat Paper 01. All 61 candidates who registered
for Unit 2 sat both Papers 01 and 02.
This is the second time which the revised syllabus is being tested with candidates sitting two papers in Units
1 & 2. Approximately the same number of candidates sat the examination when compared to last year;
however the numbers were evenly spread across the units. As in previous years, the performance is quite
poor.
The examiners are of the opinion that performance would be improved if candidates were given a booklet of
formulae to be used in the examination. Providing formula booklets for candidates will not compromise the
quality of examination since the paper setting exercise would take this into consideration when setting
papers.
DETAILED COMMENTS
UNIT 1
PAPER 01
This paper in which all questions were compulsory, accounted for a total of 90 marks. The range of marks
scored by candidates was 0 56. One candidate scored above 50 per cent, whereas six candidates (10 per
cent) scored in the 40 50 per cent range. Thirty-four candidates (58 per cent) scored in the 20 39 range.
The remaining 18 candidates (31 per cent) scored below 20 marks.
MODULE 1
DC Circuit Theory
Candidates were required to use fundamental laws and simple theory to solve simple DC circuits. From a
possible 30 marks, the highest score was 26 and three candidates scored zero. Approximately 25 per cent of
the candidates scored 50 per cent or above on Module 1. Six candidates scored in the 21 30 range, nine
scored in the 15 -20 range, fourteen (16 per cent) scored in the 10 14 range and the remaining 28 candidates
scored below 10 marks.
Question 1
Twenty-two per cent of the candidates were able to provide perfect responses (5 6 marks) whereas 50 per
cent scored in the 0 2 marks range from a possible six marks. Candidates experienced difficulties in
calculating mesh currents. 3
Question 2
Sixteen per cent of the candidates were able to provide perfect responses whereas 46 per cent scored between
0 and 2 marks from a possible six marks. Most candidates experienced difficulties with the second section
of the question where they were asked to calculate voltage across a capacitor.
Question 3
Fourteen per cent of the candidates were able to provide perfect responses whereas 66 percent scored
between 0 and 2 marks from a possible six marks. Most candidates experienced difficulties with the second
section of the question where they were asked to calculate time constant.
Question 4
Thirty three per cent of the candidates were able to provide perfect responses whereas 20 per cent scored
between 0 and 2 marks from a possible six marks. Few candidates had difficulties with this question.
Question 5
Three per cent of the candidates were able to provide perfect responses whereas 88 per cent scored between
0 and 2 marks from a possible six marks. Most candidates experienced difficulties with this question. They
were unable to manipulate the temperature coefficient formula.
MODULE 2
Analogue Electronics & Communications
Basic analogue and electronics and communications concepts were covered in this Module. This Module
proved to be somewhat challenging. The highest score was 20 and five candidates scored zero from a
possible 30 marks. Of the 59 candidates, none scored in the 21 and above range. Six scored in the 15 20
range, 12 scored in the 10 14 range and the remaining 41 scored below 10 points.
Question 6
Five per cent of the candidates were able to provide perfect responses whereas 89 per cent scored between
0 and 2 marks from a possible six marks. Most candidates experienced difficulties with all parts of the
question. They do not understand semiconductor doping.
Question 7
None of the candidates were able to provide perfect responses, five per cent scored between 1 and 2 marks
while 66 per cent either did not attempt the question or scored zero from a possible six marks. A few
candidates were able to explain how the clipper works but were unable to sketch the out put wave.
Question 8
Thirteen per cent of the candidates were able to provide perfect responses, 33 per cent scored between 1 and
2 marks while 33 per cent either did not attempt the question or scored zero from a possible six marks. It
appears that candidates were not familiar with the characteristics curves of the transistor. 4
Question 9
Twenty-one per cent of the candidates were able to provide perfect responses, 23 per cent scored between 1
and 2 marks while 23 per cent either did not attempt the question or scored zero from a possible six mark.
The diagram of the summing circuit was widely known, however most candidates were unable to provide
and use the formula to determine the output.
Question 10
None of the candidates were able to provide perfect responses, 15 per cent scored between 1 and 2 marks
while 62 per cent either did not attempt the question or scored zero from a possible six marks. Candidates
were not familiar with ground wave propagation.
MODULE 3
Introduction to Power Systems
This was the most challenging of the three Modules. The highest score was 17 and seven candidates scored
zero from a possible 30 marks. Of the 59 candidates, five 5 scored in the 15 20 range, 12 scored in the 10
14 range and the remaining 42 scored below 10 marks. Most candidates were ill prepared for this Module.
Question 11
Only three candidates (5 per cent) were able to provide near perfect responses, 33 per cent scored between
1 and 2 marks while 50 per cent either did not attempt the question or scored zero from a possible six marks.
Candidates were unable to define magnetomotive and magnetizing force.
Question 12
None of the candidates were able to provide perfect responses, 25 per cent scored between 1 and 2 marks
while 66 per cent either did not attempt the question or scored zero from a possible six marks. Most candidates
were not familiar with DC machines and magnetization curves.
Question 13
Only one candidate was able to provide a near perfect response, 33 per cent scored between 1 and 2 marks
while 26 per cent either did not attempt the question or scored zero from a possible six marks. Only a few
candidates were able to identify where fuses and circuit breakers are located in a typical electrical system.
Question 14
Only one candidate was able to provide a perfect response, 44 per cent scored between 1 and 2 marks while
41 per cent either did not attempt the question or scored zero from a possible six marks. Only a few candidates
were able to identify where fuses and circuit breakers are located in a typical electrical system.
Question 15
Twenty-five per cent of the candidates were able to provide prefect responses, 33 per cent scored between
1 and 2 marks while 26 per cent either did not attempt the question or scored zero from a possible six marks.
Most candidates were able to identify parts of the motor but were unable to explain their functions. 5
PAPER 02
Sixty-one candidates sat this paper. They were required to do six questions from this paper which accounts
for 150 marks. Questions 1, 4 and 7 are compulsory and value 30 marks each. Candidates were required to
select one of the remaining two questions in each Module for a value of 20 marks each. Most candidates
attempted the required two questions from each Module.
The range of the marks obtained was 0 -78. Only Three candidates (5 per cent) scored in the 70 100 range.
Nine candidates (15 per cent) scored in the 50 -69 range. Eighteen (18) candidates (30 per cent) scored in
the 30 49 range, twenty three (38 per cent) scored in the 10 29 range. Only six candidates (10 per cent)
scored below 10 marks.
MODULE 1
DC Circuit Theory
Candidates were required to do Question 1 and one other from this section. From a possible score of 50
from this module, the highest score was 40. Six candidates scored in the 31 50 range, seven candidates
scored in the 20 30 range, 22 scored in the 10 19 range, 26 scored in the 1- 9 range and one candidate
scored zero.
Question 1
Eleven per cent of the candidate