KCSE 2018 Power Mechanics Paper 2 with Marking Scheme

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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 2 iuahda

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)

PART  NAME  DEFECT  CAUSE 
A      
B      
     
D      
     

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)

ITEM  NAME  USE
     

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

drawing  6 main parts x 1  (6 marks) 
labelling 4 parts x 1/2 (2 marks)
proportional   (1 marks)
cross sectional   (1 marks)
    (10 marks)

STATION 1 HBAD
STATION 3

PART  NAME  DEFECT  CAUSE 
A engine oil filter worn out  long use 
B valve spring distorted long use
sump guard gasket worn out long use
D headlight bulb dim deflect short circuiting
sparking plug oiled leaking lubrication
  1/2 x 5 = 2 1/2 1/2 x 5 = 2 1/2 1 x 5


STATION 9

ITEM  NAME  USE
I piston ring compressor to compress piston rings when assembly - 3 
J flywheel puller to extract the flywheel
K stud extractors removes broken studs or bolts
L multi-meter measuring voltage, current , resistance
M wire gap gauge checking sparking plug gaps
N needle nose pliers(swipe-nose) removing or inserting small springs, caps washers, wires
O ratchet handle used in conjunction with spanner sockets to open/loosen nuts/bolts in one direction
P Allen key to tighten or loosen Allen screws
Q cape chisel cut metal parts usually hammer force
R odd leg calipers for scribing lines parallel to an edge
  (1/2 x 10) (1/2 x 10)

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