KCSE 2017 Power Mechanics Paper 2 with Marking scheme

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STATION 1

In the space below, sketch in good proportion an exploded view of the piston-connecting rod assembly
Label any six parts.  (10 marks)

STATION 2

Instructions

Using the tools, equipment and materials provided, make the handle shown in Figure 1.   (10 marks)

                                  KCSE 2017 PM PP2 Q2

STATION 3

Identify the items labelled A, B, C, D and E. For each item, state the material it is made of and one use in a motor vehicle. Complete the table below.   (10 marks)

 ITEM   NAME   MATERIAL   USE 
   A      
   B      
   C      
   D      
   E      

STATION 4

Using the tools, equipment and the single cylinder engine provided, carry out the dry compression test. Make a comment about the readings obtained to the examiner.   (10 marks)

STATION 5

Using the materials and components provided, connect the four lamp lighting circuits such that each lamp gives maximum illumination. Let the examiner see your work.   (10 marks)

STATION 6

Using the tools and materials provided, cut the gasket to fit the surface of the component provided, cut the gasket to fit the surface of the component provided.  (10 marks)

STATION 7

Name the parts labelled V, W, X, Y and Z. For each part, identify one defect and state its effect on vehicle operation
(10 marks)

 PART   NAME   DEFECT   EFFECT 
   V      
   W      
   X      
   Y      
   Z      

STATION 8

Dismantle the oil pump provided. Measure and record the following;

  1. Rotor body clearance
  2. Rotor tip clearance

Re-assemble the pump and test it for functionality.  (10 marks)
LET THE EXAMINER SEE YOUR WORK.

STATION 9

On the single cylinder engine provided,

  1. Remove the exhaust valve and replace it with the one provided. Let the examiner check your work.
  2. Measure and record exhaust valve clearance  (10 marks)

STATION 10

On the multi-cylinder engine provided, carry out the following tasks:

  1. Remove spark plug for cylinder number 2;
  2. Check its condition and explain to the examiner;
  3. Service the spark plug;
  4. Replace the spark plug.      (10 marks)

LET THE EXAMINER CHECK YOUR WORK.



MARKING SCHEME

STATION 1

                                         KCSE 2017 PM PP2 Ans1

 Sketching any 6 exploded parts   (6x1)   (6 marks) 
 Correct labelling  (any 6x½)   (3 marks) 
 Propotionality    (1 mark)
   TOTAL  10 marks

STATION 3

 ITEM   NAME   MATERIAL   USE 
   A  Exhaust gasket   Asbestos with copper or aluminium  Seals between engine block and exhaust manifold. 
   B  O-ring  Neoprene rubber  Prevents leakage between shaft and housing. 
   C  Brake fluid  Vegetable oil  Transmits braking force.
   D   Grease   Mineral oil  Lubrication of gears.
   E  Oil strainer  Steel  Filter oil
    5x½ = 2½ marks    5x½ = 2½ marks   5x1 = 5 marks
                                                   Total=10 marks

STATION 7

 PART   NAME   DEFECT   EFFECT 
   V  Engine mount    Broken  Excessive vibration ; Judder  
   W  Fuel filter  Clogged  Insufficient fuel delivery 
   X  Cylinder head gasket   Burnt or worn   No compression 
   Y  Distributor cap   Cracked  Engine won't start
   Z  Inlet valve  Worn/bent   No compression 
    5x½ = 2½ marks   5x½ = 2½ marks    5x1 = 5 marks

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