INSTRUCTIONS TO CANDIDATES
- This paper consist of five exercises
- Answer all the five exercises
- Each exercise takes 30 minutes
Questions
EXERCISE 1
- Using materials, components anmd equipment provided, perform the following tasks.
- Connect the circuit in Figure.
Let the examiner check your work. - Close switch S and adjust the power supply to obtain values of voltage shown in Table 1 for each voltage obtained measure and record in the table the corresponding values of current (6 marks)
Voltage(V) 1 3 5 7 8 10 Current I(mA) - Use the values in Table 1 and draw and draw agraph of current against voltage
- Determine the gradient of the graph
- Name the quantity expressed by the gradient the graph.
- Connect the circuit in Figure.
EXERCISE 2
- Use the materials , tools and equipment provided to make the battery holder in Figure 2 tools, equipment andf materials provided to make the brackets shown in Figure 2. (20 marks)
Details of A
Seam; 10mm wide
Slot; 50mm from seamed joint
EXERCISE 3
- Use the tools, equipment and materials provided to carry out the following tasks.
- Terminate the three-core flexible cable to the top plug and the iron box
- Turn the thermostat switch to ON position, measure and record the values of resistance between;
- Live and Neutral at plug .....Ω
- Live and earth at plug .... Ω
- Earth at plug and iron box body ...Ω
- Neutral at plug and iron box ...Ω
EXERCISE 4
- Using the pre-fabricated circuit provided in Figure 3. Perform the following tasks
- With the power supply OFF
- Connect the milliameter between A and B (Observe the polarity) (1 mark)
- Connect the voltmeter between C and D (Observe the polarity). Let the examiner check your work.
- with power supply ON.
Adjust the variable resisror to obtain current values in Table 2 and in each case measure and record the corresponding values of voltage.
Table 2
Voltage(V) 1 3 5 7 8 10 Current I(mA) -
- Plot the graph of current against voltage.
- Use the graph to determine the value of current when the voltage is 5.0V (7 marks)
Value
- With the power supply OFF
EXERCISE 5
- Figure 4 shows the layout of a final circuit. Using PVC sheathed cable wiring system , install the lamps to be controlled by the one way switch.
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