waecE-LEARNING
Technical Drawing Paper 1, May/June 2013  
Questions: 1 2 3 4 Main
General Comments
Weakness/Remedies
Strenght






Question 1

 
  1. A square pipe penetrates a right cone as shown below.
  1. copy the given view.
  1. draw the:
  2. curve of interpenetration;
  3. development of the square pipe using PQ as seam.


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OBSERVATION

  Candidates were expected to:

  1. copy the given views correctly;
  2. draw the square pipe □30 in end elevation;
  3. draw the cone and square pipe in elevation;
  4. draw the cone and square pipe in plan;
  5. divide the side of the square pipe in the end view into a number of parts;
  6. project the divisions horizontally to the side of cone in elevation and vertically down to plan;
  7. draw the concentric circles;
  8. draw end view of the square pipe in the plan and project the divisions from the end view in elevation;
  9. project horizontal lines from the end elevation in plan to intersect concentric circles;
  10. draw curves of intersection in plan;
  11. draw curves of interpenetration in elevation;
  12. draw the perimeter (QQ) of the square pipe;
  13. transfer the divisions on the square pipe to each side of the perimeter;
  14. draw the corresponding ordinates at the division points from plan or elevation;
  15. join the ends of ordinates into smooth curves;
  16. define the corners of the square pipe;
  17. use PQ as seam;
  18. draw neatly.

The solution is shown below

 

 

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