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Technical Drawing Paper 1,Nov/Dec. 2009  
Questions: 1 2 3 4 Main
General Comments
Strength
Weakness/Remedies









Question 2

Construct, full size, the template shown below, showing clearly the:

(i) centres of the arcs
(ii) points of tangency.

2b) Two circles, P and Q diameters 50 and 40 respectively, touch each other tangentially:
Draw:

i). the circles;
(ii) a circle R, diameter 150, to include circles P and Q tangentially' at the upper part
(iii) an arc, radius 20, to exclude circles P and Q tangentially at the lower point.

 

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OBSERVATION

The question required candidates to use the principle of tangency of arcs and lines. A little arithmetic is required to determine the centre of the . tange .rtial arcs.

Some candidates got the solution correctly as shown below

2b) The solution is shown below. It required some arithmetic to determine the centre and radii of the tangential circles. Less than 50% of the candidates got the solution.

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