A circle will appear on an isometric drawing as a(n) __ .
A) ellipse
B) cycloid
C) circle
D) parabola
ANS: A
- An axonometric drawing which has two axes divided by equal angles is:
A) dimetric
B) trimetric
C) orthographic
D) isometric
ANS: A - An axonometric drawing which has all three axes divided by equal angles is:
A) dimetric
B) trimetric
C) orthographic
D) isometric
ANS: D
The Correct Answer and Explanation is :
The correct answers to the given questions are as follows:
- A circle will appear on an isometric drawing as a(n) __ .
- Answer: A) ellipse Explanation:
In isometric drawings, the three axes (X, Y, and Z) are all set at equal angles of 120° to one another. This creates a visual distortion of shapes, and circles are no exception. A true circle in a 3D space would typically appear as a perfect circle when viewed directly along its axis. However, in an isometric view, this circle will appear as an ellipse because of the angles involved in the projection. The distortion occurs because the isometric view represents a 3D object in a 2D plane, and the equidistant spacing of the axes causes a circular shape to stretch or compress into an ellipse depending on its orientation.
- An axonometric drawing which has two axes divided by equal angles is:
- Answer: A) dimetric Explanation:
Axonometric projections are used to represent three-dimensional objects in two dimensions, where the object is rotated along one or more axes to reveal multiple sides. In a dimetric projection, two of the three axes are at equal angles, while the third axis is at a different angle. This means that two of the axes are equally foreshortened, while the third axis is not, giving a distortion that’s different from both isometric and trimetric projections. Dimetric projections often provide a more easily recognizable shape than trimetric projections but less symmetry than isometric projections.
- An axonometric drawing which has all three axes divided by equal angles is:
- Answer: D) isometric Explanation:
In an isometric projection, all three axes (X, Y, and Z) are divided by equal angles of 120° from one another. This creates a uniform distortion where all three axes are foreshortened equally, giving a clear, balanced view of the object. This isometric view maintains the symmetry of the object, making it easier to understand and visualize. It is one of the most commonly used forms of axonometric drawing because it provides a practical compromise between true-to-scale and clarity of the object’s features. The uniform foreshortening allows for measurements along each axis to be scaled equally.
In summary:
- A circle appears as an ellipse in an isometric drawing due to the angle distortion.
- A dimetric drawing has two axes at equal angles.
- A isometric drawing has all three axes at equal angles.