Auto mechanics Paper 2 WASSCE (SC), 2023

Question 1

 

  1.       (a)   Explain the following processes that take place in the four-stroke petrol engine:

(i) induction stroke;    (ii) compression stroke;          (iii) power stroke.
(b)   List two firing orders for a four-cylinder, four-stroke engine.
(c)   Name four parts of a piston.

 

Observation

 


The attempts on 1(c) part of this question wasnotgood enough. Most candidates could not name the parts of a piston. The solutions to the poorly answered part of the question are given below

(c)        Parts of a piston       

  • Combustion chamber
  • Crown or piston crown                                              
  • Slot or heat barrier slot
  • Lands or ring lands
  • Ring grooves, piston ring groove(s) or ring belt
  • Skirt or body
  • Gudgeon pin bosses
  • Circlip groove
  • Gudgeon pin hole or piston pin hole