What are views of an object projected onto two or more orthographic planes called?

The correct answer is understood as multiview drawings, which are used to represent an object from multiple angles on different orthographic planes. This technique allows for a comprehensive understanding of an object's dimensions and spatial relationships.

Multiview drawings typically include the front, top, and side views of the object, all of which are projected onto distinct planes. These views provide a clear and accurate representation, enabling engineers and designers to communicate detailed specifications without the distortion that might occur in a three-dimensional representation. This method is crucial for technical drawings in engineering and design, ensuring that all necessary measurements and angles can be conveyed effectively.

The other options, such as perspectives and pictorial drawings, represent objects in a way that emphasizes depth and realism, which can be less precise for technical purposes. Isometric sketches, while useful for illustrating three-dimensional objects, do not typically conform to the strict standards of orthographic projection and may not depict true dimensions as clearly as multiview drawings do. Thus, multiview drawings are fundamental in engineering design for accurate communication.