The trimetric pictorial drawing is one in which only one of the three principal axes makes an equal angle with the plane of projection.
a. True
b. False
The correct answer and explanation is:
The correct answer is a. True.
In a trimetric pictorial drawing, the three principal axes (X, Y, and Z axes) are not equally inclined to the plane of projection. Instead, only one of these axes makes an equal angle with the plane of projection, while the other two axes are foreshortened by unequal factors. This makes the trimetric projection distinct from other types of pictorial projections, such as isometric and dimetric projections.
In isometric projection, all three axes are equally inclined to the plane of projection, meaning that the angles between each pair of axes are the same. In dimetric projection, two axes make equal angles with the plane of projection, while the third is foreshortened by a different amount.
In trimetric projection, the foreshortening of the axes varies. The angles between the axes are not the same, and each axis is foreshortened by a different amount. This results in a more distorted but potentially more realistic representation of an object, as it can convey a sense of depth and dimension that is different from the more uniform distortions seen in isometric or dimetric projections.
The key point is that trimetric projection allows for more flexibility in representing objects with different dimensions along the axes, giving a more varied visual effect. This is why it is often used when a more complex or detailed view is needed to represent an object in a way that emphasizes certain features more than others.