building construction Paper 2 WASSCE (PC 2ND), 2018

Question 4

 

(a) List three materials used for the manufacture of water supply pipes.
           
(b)Use a sketch to illustrate the smoke method of testing a drainage system.
                       
(c) Sketch the conventional symbol of each of the following electrical fittings:

  1. electric fan;
  2. fluorescent lamp;
  3. two-way switch.

Observation

 

Most candidates were able to:

- list three materials used for the manufacture of water supply pipes.

- sketch the conventional symbol of each of the following electrical fittings:

  • electric fan;
  • fluorescent lamp;
  • two-way switch.

However, many of them failed to use a sketch to illustrate the smoke method of testing a drainage system.

The expected response to question 4 is as given below:

 

4 (a) Materials used for the manufacture of water pipes:

 

  • plastic (P.V.C);
  • asbestos cement pipe;
  • galvanized mild steel;
  • lead;
  • copper;
  • cast iron.

 

(b) A sketch to illustrate the smoke method of testing drainage system:

           

 

(c)  Sketch of the conventional symbol of each of the following electrical fittings:
(i) electric fan;


      
(ii) fluorescsent lamp;

OR

(iii)two-way switch