Technical Drawing - Exam Papers - Ordinary - 1994 - Paper 1

Question 6

1. In an ellipse the focus is 45 mm from the directrix and the eccentricity is 3/2. Draw the ellipse showing clearly how the points of the curve are located.
2. In Fig. 6 the line DD is the directrix of an ellipse, the line AB shows the direction of the major axis and P is a point on the curve. The eccentricity of the ellipse is 3/4.
   Show how the position of the focus F is determined and draw half the curve. Construct a tangent to the curve from the point Q.