INSTRUCTIONS TO CANDIDATES
- This paper contains four exercises each 20 marks.
- Attempt all the exercises for 30 minutes each.
QUESTIONS
EXERCISE 1
Using materials, components and equipment provided, perform the following tasks.
- Correct the circuit shown in figure 1. (3 marks)
Let the examiner check your work.
Potentiometer
Figure 1 - Close switch S.
- Adjust the potentiometer for the ammeter to obtain current values in table 1 and in each case record the corresponding voltage values. (7 marks)
- Calculate the values of and record them in the spaces provided in the table.
- Use the values in the table to draw a graph of voltage against current.
- Determine the slope of the graph. (2 marks)
- From the graph, determine the voltage, V when the current I = 160 mA.
V = ................................................................................................ .. (1 mark) - State the purpose of the experiment. (1 mark)
EXERCISE 2
Use the tools, equipment and materials provided to make the bracket shown in figure
EXERCISE 3
3. Use the components and equipment to connect the circuit illustrated in figure 4. Let the examiner see your work. (2 marks)
Perform the following tasks:
- Switch on the power supply.
- Adjust the power supply to obtain each of the voltage values across U as shown in table 3 and in each case, record the corresponding current: (5 marks)
Table 3
V 0.4 0.5 0.6 0.7 0.8 I - Switch off the power supply and reverse its connections.
- Adjust the power supply to obtain each of the voltage values across U as shown in table 4 and in each case, record the corresponding current. (5 marks)
Table 4
V -0.5 -1 -3 -4 -5 I - Use the values of I and V from tables 3 and 4 to draw the graph of current (I) against voltage (V) on the same axes. (7 marks)
- From the shape of the graph, identify component U. (4 marks)
EXERCISE 4
Figure 5 shows the layout of a lighting installation. Using PVC sheathed cables, install the circuit such that the lamps are controlled at one point. (20 marks)
MARKING SCHEME
Exercise 1
|
AREA TO BE MARKED |
MAXIMUM SCORE |
ACTUAL SCORE |
|
|
a |
Connection observing polarity |
2 |
|
|
c. i |
Connecting resistor |
2 |
|
|
SUB TOTAL |
4 |
||
Exercise 2
|
AREA TO BE MARKED |
AWARDING |
MAXIMUM SCORE |
ACTUAL SCORE |
|
|
1 |
Dimensions (±2) 80 40 70 20 |
(2 x ½ ) (4 x ½ ) (2 x ½ ) (2 x 1) |
1 2 2 2 |
|
|
2 |
Cuts |
(2 x 2) (2 x ½ ) |
4 1 |
|
|
3 |
Holes |
(2 x 1 ) (2 x 1 ) |
2 2 |
|
|
4 |
Folding |
(2 x 1) |
2 |
|
|
5 |
Finishing |
(1 x 1 ) (1 x 1) |
1 1 |
|
|
TOTAL MARK |
20 |
|||
Exercise 3
|
AREA TO BE MARKED |
MAXIMUM SCORE |
ACTUAL SCORE |
|
|
a |
Connection observing polarity |
3 |
|
|
SUB TOTAL |
3 |
||
Exercise 4
|
AREA TO BE MARKED |
AWARDING |
MAXIMUM SCORE |
ACTUAL SCORE |
|
|
1 |
Dimensions (±2) |
(4 x ½ ) |
2 |
|
|
2 |
Fixing components firm and level |
(4 x 1) |
4 |
|
|
3 |
Correct choice of cables |
(2 x ½ ) |
1 |
|
|
4 |
Cable runs (flat on surface) |
(3 x ½ ) (3 x ½ ) (2 x ½ ) |
1½ 1½ 1 |
|
|
5 |
Uniform spacing of tack nails and buckle clips |
(1x1) |
1 |
|
|
6 |
Cable termination (twisted, firm, folded and not nicked) at: |
(1 x 2) (1 x 1) (1 x 2 ) |
2 1 2 |
|
|
7 |
Correct circuit connection |
2 |
||
|
8 |
Color code |
(2 x ½ ) |
1 |
|
|
TOTAL MARKS |
20 |
|||
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