# KCSE 2019 Power Mechanics Paper 2 Questions with Marking Scheme

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

1. Measure and record the resistance of the primary and secondary winding
2. 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:

1. Inspect the hom and comment on its mechanical condition.(1 mark)
2. Connect the hom circuit. Let the examiner see your work.(7 marks)
3. 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 VEHICLESYSTEM DEFECT EFFECT F G H I J

STATION 7

On the single cylinder engine provided:

1. Service the air cleaner(4 marks)
2. 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:

1. Remove the float bowl of the carburettor provided.
2. Remove the needle valve and show it to the examiner. Comment on its service condition
3. Take the necessary measurements to determine the following:
1. Float level
2. Float drop
4. 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:

1. Identify four parts driven by the fan belt and in each case, state which system it belongs to.(4 marks)
2. Conduct visual checks on the following parts of the cooling system and in each case, comment on its service condition.
3. 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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