6-16. In orthographic projections, the technique you use to represent an object on the plane of projection involves which of the following  elements? 1. 2. 3. 4. The use of projectors that are parallel to each other and perpendicular to the plane of projection The assumption that the viewer is infinitely distant from the object and its plane of projection The assumption that the viewer is midway between the object and its plane of projection The use of projectors that converge at a central point 6-17. What common feature classifies axonometric  drawings  as  orthographic projections? 1. Only one plane of projection is shown 2. Three faces of the object are shown 3. The object is rotated into the plane of projection 4. The projectors are perpendicular to the plane of projection 6-18. A drawing that shows three faces of an object in one view and presents the object as it approximately appears to the observer is drawn to what type of projection? 1. Axonometric 2. Orthographic 3. Cabinet 4. Quadromatic 6-19. What is a distinguishing feature of axonometric  projections? 1. The position of the views in relation to the plane of projection 2. The inclined position of the object to the plane of projection 3. The lack of distortion in the views 4. The position of the projectors to the plane of projection 6-20. 6-21. 6-22. 6-23. 6-24. Which of the following projections indicates equally foreshortened surfaces? 1. Oblique 2. Cabinet 3. Isometric 4. Orthographic In isometric projections, isometric planes have what angular relationship at the intersection of the isometric axes? 1. 30° 2. 60° 3. 90° 4. 120° When you make an isometric scale, what angle should you make with the horizontal? 1. 30° 2. 45° 3. 60° 4. 90° Which of the following lines is an isometric line? 1. A line bisecting the isometric angles 2. A line parallel to the vertical axis 3. A line connecting isometric axes 4. A line perpendicular to isometric axes Any line not parallel to the isometric axes is known as what type of line? 1. Nonisometric 2. Perspective 3. Foreshortened 4. Oblique 36