KCSE 2018 Power Mechanics Paper 2 with Marking Scheme

QUESTIONS

STATION 1
Sketch a cross-sectional drawing of a conventional coil and label four parts.(10 marks)

STATION 2
Using the tools, equipment and materials provided make the bracket shown in the figure below.(10 marks)

STATION 3
Name the parts labelled A to E. For each part, identify one defect and one possible cause and complete the table below.(10 marks)

STATION 4
Using the tools provided, determine the compression ratio for the single cylinder engine (take clearance volume to be 0.15 cc).(10 marks)

STATION 5
Using the materials and components provided connect a lighting circuit such that three lamps are in parallel and two are in series. (10 marks)
LET THE EXAMINER CHECK YOUR WORK

STATION 6
For the gearbox provided determine the gear ratio for the following gears: 

1. gear 1 .................
2. reverse .............(10 marks)

STATION 7
On the vehicle provided: 

1. Name the part labelled
   F.................................
   G.................................
   H.................................(3 marks)
2. Demonstrate to the examiner the following:
   1. How to determine the lock to lock distance of the steering wheel
   2. How to set the steering wheel to straight ahead position (7 marks)

STATION 8
Demonstrate to the examiner how to determine the following measurements:

1. Taper and ovality of the crankpin marked "X" using a micrometer.(4 marks)
2. Big end clearance of the crankpin marked "Y" using a plasti-gauge.(6 marks)

STATION 9
Identify the tools labelled I to R and state one use of each.(10 marks)

STATION 10
On the multi-cylinder engine provided carry out the following tasks.

1. check and comment on the oil level(4 marks)
2. service the air filter(6 marks)

MARKING SCHEME

STATION 1

STATION 3

STATION 9