Power Mechanics Paper 2 (447/2)
STATION 1
In the space below, sketch in good proportion an exploded drawing of a double-piston wheel cylinder braking system.(10 marks)
STATION 2
Use the materials, tools and equipment provided to make the sheet metal bracket shown in Figure 1. (10 marks)
STATION 3
Identify the items labelled A to E. For each item, state the material it is made up of, and state its use in a motor vehicle. Complete the table below.(10 marks)
| PART | NAME | VEHICLE SYSTEM | PURPOSE |
| A | |||
| B | |||
| C | |||
| D | |||
| E |
STATION 4
Using the multimeter and the ignition coil provided, perform the following tasks and make the appropriate conclusion in each case
- Measure and record the resistance of the primary and secondary winding
- Test the coil for ground
Complete the table below. (10 marks)
Measurement/Test Reading (Ω) Conclusion Primary Winding Resistance Secondary Winding Resistance Coil Ground Resistance
STATION 5
Using the materials, components and tools provided, perform the following tasks:
- Inspect the hom and comment on its mechanical condition.(1 mark)
- Connect the hom circuit. Let the examiner see your work.(7 marks)
- Adjust the sound to attain a smooth medium hooting.(2 marks)
STATION 6
Identify the vehicle parts labelled F, G, H, I and J. For each part, state the vehicle system it belongs to, identify one defect and one possible effect to the vehicle operation Record your answers in the table below. (10 marks)
| PART | NAME | VEHICLE SYSTEM |
DEFECT | EFFECT |
| F | ||||
| G | ||||
| H | ||||
| I | ||||
| J |
STATION 7
On the single cylinder engine provided:
- Service the air cleaner(4 marks)
- Demonstrate to the examiner how to check the quality of the spark produced by the spark plug.(6 marks)
STATION 8
Using the tools provided, perform the following operations:
- Remove the float bowl of the carburettor provided.
- Remove the needle valve and show it to the examiner. Comment on its service condition
- Take the necessary measurements to determine the following:
- Float level
- Float drop
- Re-assemble the carburettor (10 marks)
STATION 9
Identify the tools labelled P, Q, R, S and T. For each tool, state its type, size and how it is used in a motor vehicle. Complete the table below. (10 marks)
| TOOL | NAME | TYPE | SIZE | USE |
| P | ||||
| Q | ||||
| R | ||||
| S | ||||
| T |
STATION 10
On the multi-cylinder engine provided:
- Identify four parts driven by the fan belt and in each case, state which system it belongs to.(4 marks)
- Conduct visual checks on the following parts of the cooling system and in each case, comment on its service condition.
- Radiator cap (1 mark)
- Radiator hoses (1 mark)
- Radiator (1 mark)
- Check the coolant levels in the radiator and its overflow tank and if necessary, top up to the required levels.(3 marks)
MARKING SCHEME
STATION 1
| Correct exploded sketches | 6 x ½ = 3 | 3 |
| Labelling (any 4 x ½) | 2 | |
| Exploded and correct | 2 | |
| Pictorial | 1 | |
| Proportionality | 1 | |
| Neatness | 1 | |
| TOTAL | 10 marks |
STATION 3
| ITEM | NAME | MATERIAL | USE |
| A | Camshaft | Forged steel | To open and close the valves |
| B | Carburretor float | Copper or brass | To regulate fuel level in car burretor |
| C | Tap | Carbon steel or high carbon steel | To cut internal threads of drilled holes. |
| D | Valve lifter | Cast iron | To lift valve open. |
| E | Hose clamp | Spring metal | To fasten hoses in the cooling system. |
| Marks | 5 x ½ = 2 ½ | 5x1=5 | 5 x ½ = 2 ½ |
STATION 6
| PART | NAME | VEHICLE SYSTEM | DEFECT | EFFECT |
| F | Fanbelt | Starting or cooling | Worn, cut | No charging Overheating |
| G | Ball joint | Steering | Worn | Loose or uncomfortable steering |
| H | High tension lead | Ignition | Broken insulation and strands | Voltage leakage |
| I | Exhaust manifold gasket | Exhaust | Broken | Leakage of gases |
| J | Oil seal | Lubrication | Deformed | Oil leakage |
| Marks | 5 x ½ = 2 ½ | 5 x ½ = 2 ½ | 5 x ½ = 2 ½ | 5 x ½ = 2 ½ |
STATION 9
| TOOL | NAME | TYPE | SIZE | USE |
| P | Plier | Slip joint or interlocking | Any, e.g. 4½ - 7½ | Used where large plier opening is required. |
| Q | Screw driver | Offset | Any | Used where clearance of ordinary screwdriver is insufficient. |
| R | Socket handle | Tee | Any, e.g, 6mm, 10mm | Holds sockets to open nuts in deep positions. |
| S | Spark plug | spanner | Any | Used for drawing circles. |
| T | Reamer | Tapered | Any | Used for smothering holes. |
| Marks | 5 x ½ = 2 ½ | 5 x ½ = 2 ½ | 5 x ½ = 2 ½ | 5 x ½ = 2 ½ |
Total - 10 marks
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