Plumbing & Pipe Fitting Paper 2, May/June 2014  
Questions: 1 2 3 4   Main
General Comments

Question 4

(4)       (a)       Sketch each of the following hand tools:
                                    (i)         pipe wrench;
                                    (ii)        hacksaw.

                        (b)       State two methods of maintaining hand tools.

                        (c)        List four types of pipe used in plumbing work.

                        This question did not pose any problem to the candidates who attempted it.

            (5)       (a)       Describe each of the following terms used in welding operation:
                                    (i)         backfire;
                                    (ii)        sustained backfire;
                                    (iii)       fusion welding

                        (b)       State two safety precautions to be observed in a plumbing workshop.

                        (c)        Sketch the symbol used to represent each of the following safety

  1. wear eye protection;
  2. do not extinguish with water.








Candidates who attempted this question performed excellently well in parts (b) and (c) of the question.  However, part (a) was extremely difficult for them.  The required response to part (a) of the question is given  below:

(a)       (i)         The retrogression of the flame into the blowpipe neck or
                        body with rapid extinction.

  1. The gas ignite right back in the blowpipe and loud  

squaking noise is emitted.  The blowpipe will turn red hot and if not turn off immediately will melt.

  1. In fusion welding a filler rod of the same material is melted in the joint zone during the process to complete the joint.



Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2015 The West African Examinations Council. All rights reserved.