waecE-LEARNING
Technical Drawing Paper 1,Nov/Dec. 2012  
Questions: 1 2 3 4 Main
General Comments
Strength
Weakness/Remedies









Question 1

(1)       The figure above shows a cone intersecting a cylinder at right angle.

                        Draw the:

  1. plan;
  2. curve of intersection;
  3. surface development of the cylinder, making PQ the seam.

A.         Front Elevation, plan and curve of Intersection

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OBSERVATION

Candidates were expected to:

  1. draw the given elevation of the cone and cylinder;
  2. draw the semi-circle of the cylinder on the elevation;
  3. draw horizontal lines from the divisions on the semi-circle to side of the cone;
  4. project downward from the front elevation to the plan;
  5. draw the semi-circle on the cylinder and divide into 6 equal parts;
  6. draw horizontal lines from the divisions on the semi-circle into the base circle;
  7. project down from the side of the cone to the centre line of the base circle on the plan;
  8. draw circles with section radii to locate points of intersection of the plan;
  9. complete the plan, curves and horizontal lines;
  10. project up from the plan and draw curve of intersection.

The solution is shown below

   (B)       Development of Cylinder

            Candidates were expected to:

  1. layout the circumference of the cylinder;
  2. draw perpendicular lines on the circumference;
  3. transfer dimensions from the cylinder on the elevation to locate the points on the perpendicular lines on the circumference.

The solution is shown below

                      

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