Auto mechanics Paper 2 WASSCE (SC), 2016

Question 5

(a) List three constituents of paint.

 

(b) State two causes of spray fog.

 

(c) With the aid of a sketch, show:
(i) correct spray pattern;
(ii) heavy centred pattern.

Observation

   (a)       Three Constituents of Paint

  • Pigment;
  • Binder;
  • Solvent (thinner) and
  • Additives.

                                                        

(b)  Two Causes of Spray Fog

  • Over atomization of the paint
  • Too thin a paint
  • Wrong use of spray gun                                                     

 

 (c)  The Sketches of Correct and Heavy-Centred Spray Pattern